diff --git a/.gowebbuild.yaml b/.gowebbuild.yaml
new file mode 100755
index 0000000..204dfa2
--- /dev/null
+++ b/.gowebbuild.yaml
@@ -0,0 +1,34 @@
+- esbuild:
+    entryPoints:
+        - frontend/the-app.js
+    outdir: ./frontend-dist
+    sourcemap: 1
+    format: 3
+    splitting: true
+    platform: 0
+    bundle: true
+    write: true
+    logLevel: 3
+    purgeBeforeBuild: false
+  watch:
+    paths:
+        - ./frontend/src
+    exclude: []
+  # serve:  # Uncomment and set a path to enable
+  #   path: ""
+  #   port: 8080
+  copy:
+    - src: ./frontend/index.html
+      dest: ./frontend-dist
+  # download:
+    # - url: https://example.com/some-file-or-asset.js
+    #   dest: ./frontend/src/vendor/some-file-or-asset.js
+  # replace:
+  #   - pattern: "*.go|*.js|*.html"
+  #     search: "Something"
+  #     replace: "This"
+  # link:
+  #   from: ../../web/tp-elements
+  #   to: ./web
+  # productionBuildOptions:
+  #   cmdPostBuild: ""
diff --git a/README.md b/README.md
index 80a39e4..4757c1d 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,6 @@
 gowebbuild
+
+# NPM Proxy
+
+The npm proxy is a small npm registry server that can be used to serve packages from the local filesystem instead of the default registry.
+This allows to install packages that haven't been published yet.
diff --git a/build.go b/build.go
index a8c5789..1d183ab 100644
--- a/build.go
+++ b/build.go
@@ -40,16 +40,18 @@ func buildAction(ctx *cli.Context) error {
 		replace(o)
 
 		if ctx.Bool("p") && o.ProductionBuildOptions.CmdPostBuild != "" {
-			fmt.Printf("Executing post production build command `%s`\n", o.ProductionBuildOptions.CmdPostBuild)
-			cmd := exec.Command("sh", "-c", o.ProductionBuildOptions.CmdPostBuild)
-			cmd.Stdout = os.Stdout
-			cmd.Stderr = os.Stderr
-			err := cmd.Run()
+			defer func() {
+				fmt.Printf("Executing post production build command `%s`\n", o.ProductionBuildOptions.CmdPostBuild)
+				cmd := exec.Command("sh", "-c", o.ProductionBuildOptions.CmdPostBuild)
+				cmd.Stdout = os.Stdout
+				cmd.Stderr = os.Stderr
+				err := cmd.Run()
 
-			if err != nil {
-				fmt.Printf("Failed to execute post production build command `%s`: %+v\n", o.ProductionBuildOptions.CmdPostBuild, err)
-				os.Exit(1)
-			}
+				if err != nil {
+					fmt.Printf("Failed to execute post production build command `%s`: %+v\n", o.ProductionBuildOptions.CmdPostBuild, err)
+					os.Exit(1)
+				}
+			}()
 		}
 	}
 
diff --git a/config.go b/config.go
index c74a95b..fcd37df 100644
--- a/config.go
+++ b/config.go
@@ -68,6 +68,15 @@ type options struct {
 	ProductionBuildOptions struct {
 		CmdPostBuild string `yaml:"cmdPostBuild"`
 	} `yaml:"productionBuildOptions"`
+	NpmProxy struct {
+		Overrides []NpmProxyOverride
+	} `yaml:"npm_proxy"`
+}
+
+type NpmProxyOverride struct {
+	Namespace   string `yaml:"namespace"`
+	Upstream    string `yaml:"upstream"`
+	PackageRoot string `yaml:"packageRoot"`
 }
 
 func readCfg(cfgPath string) []options {
diff --git a/fsutils/helpers.go b/fsutils/helpers.go
new file mode 100644
index 0000000..f21324b
--- /dev/null
+++ b/fsutils/helpers.go
@@ -0,0 +1,48 @@
+package fsutils
+
+import (
+	"errors"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func FindFiles(root, name string) []string {
+	paths := []string{}
+
+	filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return nil
+		}
+
+		if !d.IsDir() && filepath.Base(path) == name && !strings.Contains(path, "node_modules") {
+			paths = append(paths, path)
+		}
+
+		return nil
+	})
+
+	return paths
+}
+
+func IsFile(path string) bool {
+	stat, err := os.Stat(path)
+
+	if errors.Is(err, os.ErrNotExist) {
+		return false
+	}
+
+	return !stat.IsDir()
+}
+
+func IsDir(path string) bool {
+	stat, err := os.Stat(path)
+
+	if errors.Is(err, os.ErrNotExist) {
+		os.MkdirAll(path, 0755)
+		return true
+	}
+
+	return err == nil && stat.IsDir()
+}
diff --git a/go.mod b/go.mod
index 8e8d36f..8449fdf 100644
--- a/go.mod
+++ b/go.mod
@@ -1,14 +1,15 @@
 module github.com/trading-peter/gowebbuild
 
-go 1.22.0
-
-toolchain go1.22.5
+go 1.23.1
 
 require (
 	github.com/Iilun/survey/v2 v2.5.1
+	github.com/Masterminds/semver/v3 v3.3.0
 	github.com/evanw/esbuild v0.23.0
 	github.com/jaschaephraim/lrserver v0.0.0-20240306232639-afed386b3640
+	github.com/kataras/golog v0.1.12
 	github.com/kataras/iris/v12 v12.2.11
+	github.com/mholt/archiver/v4 v4.0.0-alpha.8
 	github.com/otiai10/copy v1.14.0
 	github.com/radovskyb/watcher v1.0.7
 	github.com/tidwall/gjson v1.17.1
@@ -24,7 +25,12 @@ require (
 	github.com/Shopify/goreferrer v0.0.0-20220729165902-8cddb4f5de06 // indirect
 	github.com/andybalholm/brotli v1.1.0 // indirect
 	github.com/aymerick/douceur v0.2.0 // indirect
+	github.com/bodgit/plumbing v1.2.0 // indirect
+	github.com/bodgit/sevenzip v1.3.0 // indirect
+	github.com/bodgit/windows v1.0.0 // indirect
+	github.com/connesc/cipherio v0.2.1 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
+	github.com/dsnet/compress v0.0.1 // indirect
 	github.com/fatih/structs v1.1.0 // indirect
 	github.com/flosch/pongo2/v4 v4.0.2 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
@@ -32,15 +38,17 @@ require (
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/gorilla/css v1.0.1 // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/iris-contrib/schema v0.0.6 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/kataras/blocks v0.0.8 // indirect
-	github.com/kataras/golog v0.1.12 // indirect
 	github.com/kataras/pio v0.0.13 // indirect
 	github.com/kataras/sitemap v0.0.6 // indirect
 	github.com/kataras/tunnel v0.0.4 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
 	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/klauspost/pgzip v1.2.5 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/mailgun/raymond/v2 v2.0.48 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
@@ -48,18 +56,23 @@ require (
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect
 	github.com/microcosm-cc/bluemonday v1.0.27 // indirect
+	github.com/nwaples/rardecode/v2 v2.0.0-beta.2 // indirect
+	github.com/pierrec/lz4/v4 v4.1.15 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/schollz/closestmatch v2.1.0+incompatible // indirect
 	github.com/sirupsen/logrus v1.9.3 // indirect
 	github.com/tdewolff/minify/v2 v2.20.37 // indirect
 	github.com/tdewolff/parse/v2 v2.7.15 // indirect
+	github.com/therootcompany/xz v1.0.1 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect
+	github.com/ulikunitz/xz v0.5.10 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/vmihailenco/msgpack/v5 v5.4.1 // indirect
 	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
 	github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 // indirect
 	github.com/yosssi/ace v0.0.5 // indirect
+	go4.org v0.0.0-20200411211856-f5505b9728dd // indirect
 	golang.org/x/crypto v0.25.0 // indirect
 	golang.org/x/exp v0.0.0-20240707233637-46b078467d37 // indirect
 	golang.org/x/net v0.27.0 // indirect
diff --git a/go.sum b/go.sum
index 3ddf26d..0d066f5 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,24 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/toml v1.4.0 h1:kuoIxZQy2WRRk1pttg9asf+WVv6tWQuBNVmK8+nqPr0=
 github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/CloudyKit/fastprinter v0.0.0-20200109182630-33d98a066a53 h1:sR+/8Yb4slttB4vD+b9btVEnWgL3Q00OBTzVT8B9C0c=
 github.com/CloudyKit/fastprinter v0.0.0-20200109182630-33d98a066a53/go.mod h1:+3IMCy2vIlbG1XG/0ggNQv0SvxCAIpPM5b1nCz56Xno=
 github.com/CloudyKit/jet/v6 v6.2.0 h1:EpcZ6SR9n28BUGtNJSvlBqf90IpjeFr36Tizxhn/oME=
@@ -10,6 +29,8 @@ github.com/Joker/hpp v1.0.0 h1:65+iuJYdRXv/XyN62C1uEmmOx3432rNG/rKlX6V7Kkc=
 github.com/Joker/hpp v1.0.0/go.mod h1:8x5n+M1Hp5hC0g8okX3sR3vFQwynaX/UgSOM9MeBKzY=
 github.com/Joker/jade v1.1.3 h1:Qbeh12Vq6BxURXT1qZBRHsDxeURB8ztcL6f3EXSGeHk=
 github.com/Joker/jade v1.1.3/go.mod h1:T+2WLyt7VH6Lp0TRxQrUYEs64nRc83wkMQrfeIQKduM=
+github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
+github.com/Masterminds/semver/v3 v3.3.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
 github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2 h1:+vx7roKuyA63nhn5WAunQHLTznkw5W8b1Xc0dNjp83s=
 github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2/go.mod h1:HBCaDeC1lPdgDeDbhX8XFpy1jqjK0IBG8W5K+xYqA0w=
 github.com/Shopify/goreferrer v0.0.0-20220729165902-8cddb4f5de06 h1:KkH3I3sJuOLP3TjA/dfr4NAY8bghDwnXiU7cTKxQqo0=
@@ -20,6 +41,19 @@ github.com/andybalholm/brotli v1.1.0 h1:eLKJA0d02Lf0mVpIDgYnqXcUn0GqVmEFny3VuID1
 github.com/andybalholm/brotli v1.1.0/go.mod h1:sms7XGricyQI9K10gOSf56VKKWS4oLer58Q+mhRPtnY=
 github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
 github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
+github.com/bodgit/plumbing v1.2.0 h1:gg4haxoKphLjml+tgnecR4yLBV5zo4HAZGCtAh3xCzM=
+github.com/bodgit/plumbing v1.2.0/go.mod h1:b9TeRi7Hvc6Y05rjm8VML3+47n4XTZPtQ/5ghqic2n8=
+github.com/bodgit/sevenzip v1.3.0 h1:1ljgELgtHqvgIp8W8kgeEGHIWP4ch3xGI8uOBZgLVKY=
+github.com/bodgit/sevenzip v1.3.0/go.mod h1:omwNcgZTEooWM8gA/IJ2Nk/+ZQ94+GsytRzOJJ8FBlM=
+github.com/bodgit/windows v1.0.0 h1:rLQ/XjsleZvx4fR1tB/UxQrK+SJ2OFHzfPjLWWOhDIA=
+github.com/bodgit/windows v1.0.0/go.mod h1:a6JLwrB4KrTR5hBpp8FI9/9W9jJfeQ2h4XDXU74ZCdM=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/connesc/cipherio v0.2.1 h1:FGtpTPMbKNNWByNrr9aEBtaJtXjqOzkIXNYJp6OEycw=
+github.com/connesc/cipherio v0.2.1/go.mod h1:ukY0MWJDFnJEbXMQtOcn2VmTpRfzcTz4OoVrWGGJZcA=
 github.com/cpuguy83/go-md2man/v2 v2.0.4 h1:wfIWP927BUkWJb2NmU/kNDYIBTh/ziUX91+lVfRxZq4=
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
@@ -28,6 +62,11 @@ github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dsnet/compress v0.0.1 h1:PlZu0n3Tuv04TzpfPbrnI0HW/YwodEXDS+oPKahKF0Q=
+github.com/dsnet/compress v0.0.1/go.mod h1:Aw8dCMJ7RioblQeTqt88akK31OvO8Dhf5JflhBbQEHo=
+github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/evanw/esbuild v0.23.0 h1:PLUwTn2pzQfIBRrMKcD3M0g1ALOKIHMDefdFCk7avwM=
 github.com/evanw/esbuild v0.23.0/go.mod h1:D2vIQZqV/vIf/VRHtViaUtViZmG7o+kKmlBfVQuRi48=
 github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
@@ -38,26 +77,62 @@ github.com/flosch/pongo2/v4 v4.0.2 h1:gv+5Pe3vaSVmiJvh/BZa82b7/00YUGm0PIyVVLop0H
 github.com/flosch/pongo2/v4 v4.0.2/go.mod h1:B5ObFANs/36VwxxlgKpdchIJHMvHB562PW+BWPhwZD8=
 github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
+github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/gobwas/glob v0.2.3 h1:A4xDbljILXROh+kObIiy5kIaPYD8e96x1tgBhUI5J+Y=
 github.com/gobwas/glob v0.2.3/go.mod h1:d3Ez4x06l9bZtSvzIay5+Yzi0fmZzPgnTbPcKjJAkT8=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
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 golang.org/x/tools v0.1.9/go.mod h1:nABZi5QlRsZVlzPpHl034qft6wpY4eDcsTt5AaioBiU=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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+google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
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 google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
 google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
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 gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
 gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 moul.io/http2curl/v2 v2.3.0 h1:9r3JfDzWPcbIklMOs2TnIFzDYvfAZvjeavG6EzP7jYs=
 moul.io/http2curl/v2 v2.3.0/go.mod h1:RW4hyBjTWSYDOxapodpNEtX0g5Eb16sxklBqmd2RHcE=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/helpers.go b/helpers.go
index cc76344..bf515e8 100644
--- a/helpers.go
+++ b/helpers.go
@@ -2,9 +2,9 @@ package main
 
 import (
 	"bufio"
-	"errors"
 	"fmt"
 	"io"
+	"net"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -12,6 +12,7 @@ import (
 
 	"github.com/evanw/esbuild/pkg/api"
 	"github.com/otiai10/copy"
+	"github.com/trading-peter/gowebbuild/fsutils"
 )
 
 func purge(opts options) {
@@ -34,7 +35,7 @@ func download(opts options) {
 	}
 
 	for _, dl := range opts.Download {
-		if !isDir(filepath.Dir(dl.Dest)) {
+		if !fsutils.IsDir(filepath.Dir(dl.Dest)) {
 			fmt.Printf("Failed to find destination folder for downloading from %s\n", dl.Url)
 			continue
 		}
@@ -82,11 +83,11 @@ func cp(opts options) {
 			continue
 		}
 
-		destIsDir := isDir(op.Dest)
+		destIsDir := fsutils.IsDir(op.Dest)
 		for _, p := range paths {
 			d := op.Dest
 
-			if destIsDir && isFile(p) {
+			if destIsDir && fsutils.IsFile(p) {
 				d = filepath.Join(d, filepath.Base(p))
 			}
 			err := copy.Copy(p, d)
@@ -113,7 +114,7 @@ func replace(opts options) {
 		}
 
 		for _, p := range paths {
-			if !isFile(p) {
+			if !fsutils.IsFile(p) {
 				continue
 			}
 
@@ -144,27 +145,6 @@ func replace(opts options) {
 	}
 }
 
-func isFile(path string) bool {
-	stat, err := os.Stat(path)
-
-	if errors.Is(err, os.ErrNotExist) {
-		return false
-	}
-
-	return !stat.IsDir()
-}
-
-func isDir(path string) bool {
-	stat, err := os.Stat(path)
-
-	if errors.Is(err, os.ErrNotExist) {
-		os.MkdirAll(path, 0755)
-		return true
-	}
-
-	return err == nil && stat.IsDir()
-}
-
 func build(opts options) {
 	result := api.Build(cfgToESBuildCfg(opts))
 
@@ -176,7 +156,7 @@ func build(opts options) {
 func getGoModuleName(root string) (string, error) {
 	modFile := filepath.Join(root, "go.mod")
 
-	if !isFile(modFile) {
+	if !fsutils.IsFile(modFile) {
 		return "", fmt.Errorf("go.mod file not found")
 	}
 
@@ -208,3 +188,28 @@ func getGoModuleName(root string) (string, error) {
 
 	return "", nil
 }
+
+func findFreePort(from, to int) int {
+	for port := from; port <= to; port++ {
+		if isFreePort(port) {
+			return port
+		}
+		port++
+	}
+
+	return -1
+}
+
+func isFreePort(port int) bool {
+	addr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("localhost:%d", port))
+	if err != nil {
+		return false
+	}
+
+	l, err := net.ListenTCP("tcp", addr)
+	if err != nil {
+		return false
+	}
+	defer l.Close()
+	return true
+}
diff --git a/linker.go b/linker.go
index 9b5c3c5..baa7295 100644
--- a/linker.go
+++ b/linker.go
@@ -11,6 +11,7 @@ import (
 	"github.com/otiai10/copy"
 	"github.com/radovskyb/watcher"
 	"github.com/tidwall/gjson"
+	"github.com/trading-peter/gowebbuild/fsutils"
 )
 
 func link(from, to string) chan struct{} {
@@ -25,7 +26,7 @@ func link(from, to string) chan struct{} {
 	}
 
 	packages := map[string]string{}
-	packageFiles := findFiles(from, "package.json")
+	packageFiles := fsutils.FindFiles(from, "package.json")
 
 	for i := range packageFiles {
 		content := readFileContent(packageFiles[i])
@@ -118,24 +119,6 @@ func isIncludedExt(srcPath string, extensions ...string) bool {
 	return false
 }
 
-func findFiles(root, name string) []string {
-	paths := []string{}
-
-	filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
-		if err != nil {
-			return nil
-		}
-
-		if !d.IsDir() && filepath.Base(path) == name && !strings.Contains(path, "node_modules") {
-			paths = append(paths, path)
-		}
-
-		return nil
-	})
-
-	return paths
-}
-
 func readFileContent(path string) string {
 	pkgData, err := os.ReadFile(path)
 
diff --git a/main.go b/main.go
index 1e6c146..d511c37 100644
--- a/main.go
+++ b/main.go
@@ -1,9 +1,12 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"os"
+	"os/signal"
 	"path/filepath"
+	"syscall"
 	"time"
 
 	"github.com/jaschaephraim/lrserver"
@@ -23,7 +26,7 @@ func main() {
 	app := &cli.App{
 		Name:    "gowebbuild",
 		Usage:   "All in one tool to build web frontend projects.",
-		Version: "6.1.2",
+		Version: "6.1.3",
 		Authors: []*cli.Author{{
 			Name: "trading-peter (https://github.com/trading-peter)",
 		}},
@@ -52,6 +55,16 @@ $ gowebbuild replace *.go foo bar
 				},
 				Action: tplAction,
 			},
+
+			{
+				Name:  "npm-proxy",
+				Usage: "proxy npm packages",
+				Flags: []cli.Flag{
+					cfgParam,
+				},
+				Action: proxyAction,
+			},
+
 			{
 				Name:  "build",
 				Usage: "build web sources one time and exit",
@@ -217,7 +230,17 @@ $ gowebbuild replace *.go foo bar
 		DefaultCommand: "watch",
 	}
 
-	if err := app.Run(os.Args); err != nil {
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
+	appCtx, cancel := context.WithCancel(context.Background())
+
+	go func() {
+		<-sigChan
+		cancel()
+		fmt.Println("Received interrupt, shutting down...")
+	}()
+
+	if err := app.RunContext(appCtx, os.Args); err != nil {
 		fmt.Println(err)
 	}
 }
diff --git a/npmproxy.go b/npmproxy.go
new file mode 100644
index 0000000..1206337
--- /dev/null
+++ b/npmproxy.go
@@ -0,0 +1,87 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/trading-peter/gowebbuild/npmproxy"
+	"github.com/urfave/cli/v2"
+)
+
+func proxyAction(ctx *cli.Context) error {
+	cfgPath, err := filepath.Abs(ctx.String("c"))
+
+	if err != nil {
+		return err
+	}
+
+	projectDir := filepath.Dir(cfgPath)
+	os.Chdir(projectDir)
+	opts := readCfg(cfgPath)
+
+	return runProxy(ctx.Context, projectDir, opts)
+}
+
+func runProxy(ctx context.Context, projectDir string, opts []options) error {
+	overrides := []NpmProxyOverride{}
+
+	for _, o := range opts {
+		overrides = append(overrides, o.NpmProxy.Overrides...)
+	}
+
+	if len(overrides) == 0 {
+		return nil
+	}
+
+	fmt.Printf("Found %d npm overrides. Starting proxy server.\n", len(overrides))
+
+	// if fs.IsFile(filepath.Join(projectDir, ".npmrc")) {
+	// 	return fmt.Errorf(".npmrc file already exists in project root.")
+	// }
+
+	freePort := findFreePort(10000, 20000)
+	freePortInternal := findFreePort(20001, 30000)
+
+	if freePort == -1 || freePortInternal == -1 {
+		return fmt.Errorf("Failed to find free ports for proxy setup.")
+	}
+
+	list := []npmproxy.Override{}
+	npmrcRules := []string{
+		";CREATED BY GOWEBBUILD. DO NOT EDIT.",
+		";This file is used by the npm proxy server.",
+		";It is used to override the default registry for specific package namespaces.",
+		";This file will be removed after the proxy server is stopped.",
+	}
+
+	for _, o := range overrides {
+		list = append(list, npmproxy.Override{
+			Namespace:   o.Namespace,
+			Upstream:    o.Upstream,
+			PackageRoot: o.PackageRoot,
+		})
+
+		npmrcRules = append(npmrcRules, fmt.Sprintf("%s:registry=http://localhost:%d", o.Namespace, freePort))
+	}
+
+	err := os.WriteFile(filepath.Join(projectDir, ".npmrc"), []byte(strings.Join(npmrcRules, "\n")), 0644)
+	if err != nil {
+		return err
+	}
+
+	defer os.Remove(filepath.Join(projectDir, ".npmrc"))
+
+	proxy := npmproxy.New(
+		list,
+		projectDir,
+		npmproxy.WithPort(freePort),
+		npmproxy.WithInternalPort(freePortInternal),
+	)
+
+	proxy.Start(ctx)
+	fmt.Println("Stopped npm proxy server")
+	return nil
+}
diff --git a/npmproxy/externalProxy.go b/npmproxy/externalProxy.go
new file mode 100644
index 0000000..9e8f732
--- /dev/null
+++ b/npmproxy/externalProxy.go
@@ -0,0 +1,92 @@
+package npmproxy
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/kataras/golog"
+)
+
+func (p *Proxy) externalHTTPServer(ctx context.Context) {
+	mux := http.NewServeMux()
+
+	srv := &http.Server{
+		Addr:    p.externalProxyHost,
+		Handler: mux,
+	}
+
+	go func() {
+		<-ctx.Done()
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+
+		if err := srv.Shutdown(shutdownCtx); err != nil {
+			fmt.Printf("Failed to shutdown proxy server: %v\n", err)
+		}
+	}()
+
+	mux.HandleFunc("/", p.incomingNpmRequestHandler)
+
+	if err := srv.ListenAndServe(); err != nil {
+		if err != http.ErrServerClosed {
+			panic(err)
+		}
+	}
+}
+
+// Receives incoming requests from the npm cli and decides based on override rules what server it should forwarded to.
+func (p *Proxy) incomingNpmRequestHandler(res http.ResponseWriter, req *http.Request) {
+	golog.Infof("Incoming NPM request for %s", req.URL.Path)
+	pkgPath := strings.TrimLeft(req.URL.Path, "/")
+
+	// If no matching override is found, we forward the request to the default registry.
+	_, ok := p.matchingOverride(pkgPath)
+	if !ok {
+		serveReverseProxy(p.DefaultRegistry, res, req)
+		return
+	}
+
+	// Process the override by forwarding the request to the internal proxy.
+
+	serveReverseProxy(p.internalProxyUrl, res, req)
+
+	// golog.Infof("Received request for url: %v", proxyUrl)
+}
+
+type ResponseWriterWrapper struct {
+	http.ResponseWriter
+	Body *bytes.Buffer
+}
+
+func (rw *ResponseWriterWrapper) Write(b []byte) (int, error) {
+	rw.Body.Write(b)                  // Capture the response body
+	return rw.ResponseWriter.Write(b) // Send the response to the original writer
+}
+
+func serveReverseProxy(target string, res http.ResponseWriter, req *http.Request) {
+	// parse the OriginalUrl
+	OriginalUrl, _ := url.Parse(target)
+
+	// create the reverse proxy
+	proxy := httputil.NewSingleHostReverseProxy(OriginalUrl)
+
+	// Update the headers to allow for SSL redirection
+	req.URL.Host = OriginalUrl.Host
+	req.URL.Scheme = OriginalUrl.Scheme
+	req.Header.Set("X-Forwarded-Host", req.Header.Get("Host"))
+	req.Host = OriginalUrl.Host
+
+	wrappedRes := &ResponseWriterWrapper{ResponseWriter: res, Body: new(bytes.Buffer)}
+
+	// Note that ServeHttp is non blocking and uses a go routine under the hood
+	proxy.ServeHTTP(wrappedRes, req)
+
+	// Print the captured response body
+	fmt.Println("Response body:", wrappedRes.Body.String())
+}
diff --git a/npmproxy/internalProxy.go b/npmproxy/internalProxy.go
new file mode 100644
index 0000000..45295b6
--- /dev/null
+++ b/npmproxy/internalProxy.go
@@ -0,0 +1,67 @@
+package npmproxy
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"path/filepath"
+	"time"
+
+	"github.com/trading-peter/gowebbuild/fsutils"
+)
+
+func (p *Proxy) internalHTTPServer(ctx context.Context) {
+	mux := http.NewServeMux()
+
+	srv := &http.Server{
+		Addr:    p.internalProxyHost,
+		Handler: mux,
+	}
+
+	go func() {
+		<-ctx.Done()
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+
+		if err := srv.Shutdown(shutdownCtx); err != nil {
+			fmt.Printf("Failed to shutdown internal server for npm proxy: %v\n", err)
+		}
+	}()
+
+	mux.HandleFunc("GET /{pkg}", func(w http.ResponseWriter, r *http.Request) {
+		pkgName := r.PathValue("pkg")
+		override, ok := p.matchingOverride(pkgName)
+
+		if !ok {
+			http.NotFound(w, r)
+			return
+		}
+
+		pkg, err := p.findPackageSource(override, pkgName)
+		if err != nil {
+			serveReverseProxy(override.Upstream, w, r)
+			return
+		}
+
+		json.NewEncoder(w).Encode(pkg)
+	})
+
+	mux.HandleFunc("GET /files/{file}", func(w http.ResponseWriter, r *http.Request) {
+		fileName := r.PathValue("file")
+		filePath := filepath.Join(p.pkgCachePath, fileName)
+
+		if !fsutils.IsFile(filePath) {
+			http.NotFound(w, r)
+			return
+		}
+
+		http.ServeFile(w, r, filePath)
+	})
+
+	if err := srv.ListenAndServe(); err != nil {
+		if err != http.ErrServerClosed {
+			panic(err)
+		}
+	}
+}
diff --git a/npmproxy/proxy.go b/npmproxy/proxy.go
new file mode 100644
index 0000000..225fea0
--- /dev/null
+++ b/npmproxy/proxy.go
@@ -0,0 +1,95 @@
+package npmproxy
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type Override struct {
+	Namespace   string
+	Upstream    string
+	PackageRoot string
+}
+
+type Proxy struct {
+	ProjectRoot       string
+	Port              int
+	InternalPort      int
+	DefaultRegistry   string
+	Overrides         []Override
+	pkgCachePath      string
+	externalProxyHost string
+	internalProxyHost string
+	internalProxyUrl  string
+}
+
+type ProxyOption func(*Proxy)
+
+func WithPort(port int) ProxyOption {
+	return func(p *Proxy) {
+		p.Port = port
+	}
+}
+
+func WithInternalPort(port int) ProxyOption {
+	return func(p *Proxy) {
+		p.InternalPort = port
+	}
+}
+
+func WithPkgCachePath(path string) ProxyOption {
+	return func(p *Proxy) {
+		p.pkgCachePath = path
+	}
+}
+
+func WithDefaultRegistry(registry string) ProxyOption {
+	return func(p *Proxy) {
+		p.DefaultRegistry = strings.TrimSuffix(registry, "/")
+	}
+}
+
+func New(overrides []Override, projectRoot string, options ...ProxyOption) *Proxy {
+	p := &Proxy{
+		ProjectRoot:     projectRoot,
+		Port:            1234,
+		InternalPort:    1235,
+		DefaultRegistry: "https://registry.npmjs.org",
+		Overrides:       overrides,
+	}
+
+	for _, option := range options {
+		option(p)
+	}
+
+	if p.pkgCachePath == "" {
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			homeDir = "."
+		}
+		p.pkgCachePath = filepath.Join(homeDir, ".gowebbuild", "proxy", "cache")
+	}
+
+	p.externalProxyHost = fmt.Sprintf("127.0.0.1:%d", p.Port)
+	p.internalProxyHost = fmt.Sprintf("127.0.0.1:%d", p.InternalPort)
+	p.internalProxyUrl = fmt.Sprintf("http://%s", p.internalProxyHost)
+
+	return p
+}
+
+func (p *Proxy) Start(ctx context.Context) {
+	go p.internalHTTPServer(ctx)
+	p.externalHTTPServer(ctx)
+}
+
+func (p *Proxy) matchingOverride(path string) (*Override, bool) {
+	for _, o := range p.Overrides {
+		if strings.HasPrefix(path, o.Namespace) {
+			return &o, true
+		}
+	}
+	return nil, false
+}
diff --git a/npmproxy/source.go b/npmproxy/source.go
new file mode 100644
index 0000000..e05225e
--- /dev/null
+++ b/npmproxy/source.go
@@ -0,0 +1,188 @@
+package npmproxy
+
+import (
+	"context"
+	"crypto/sha512"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"github.com/Masterminds/semver/v3"
+	"github.com/kataras/golog"
+	"github.com/mholt/archiver/v4"
+	"github.com/trading-peter/gowebbuild/fsutils"
+)
+
+func (p *Proxy) readPackageJson(pkgPath string) (PackageJson, error) {
+	pkgFile := filepath.Join(pkgPath, "package.json")
+
+	if !fsutils.IsFile(pkgFile) {
+		return PackageJson{}, fmt.Errorf("package.json not found in %s", pkgPath)
+	}
+
+	pkgData, err := os.ReadFile(pkgFile)
+	if err != nil {
+		return PackageJson{}, err
+	}
+
+	pkg := PackageJson{}
+	err = json.Unmarshal(pkgData, &pkg)
+	if err != nil {
+		return PackageJson{}, err
+	}
+
+	return pkg, nil
+}
+
+func (p *Proxy) findDependencyVersionConstraint(projectPkg PackageJson, pkgName string) (*semver.Constraints, error) {
+	if verStr, ok := projectPkg.Dependencies[pkgName]; ok {
+		return semver.NewConstraint(verStr)
+	}
+
+	return nil, fmt.Errorf("package %s not found in project dependencies", pkgName)
+}
+
+func (p *Proxy) findPackageSource(override *Override, pkgName string) (*Package, error) {
+	pkgNameParts := strings.Split(pkgName, "/")
+	pkgPath := filepath.Join(override.PackageRoot, pkgNameParts[len(pkgNameParts)-1])
+
+	// Read the projects package.json and figure out the requested semver version, which probably will be a contraint to assert against (like "^1.2.3").
+	projectPkg, err := p.readPackageJson(p.ProjectRoot)
+	if err != nil {
+		return nil, err
+	}
+
+	reqVersion, err := p.findDependencyVersionConstraint(projectPkg, pkgName)
+
+	pkg, err := p.readPackageJson(pkgPath)
+	if err != nil {
+		return nil, err
+	}
+
+	pkgVersion, err := semver.NewVersion(pkg.Version)
+	if err != nil {
+		return nil, err
+	}
+
+	if !reqVersion.Check(pkgVersion) {
+		golog.Infof("Version %s in package sources for %s is not meeting the version constrains (%s) of the project. Forwarding request to upstream registry.", pkgVersion, pkgName, reqVersion)
+		return nil, nil
+	}
+
+	pkgArchive, err := p.createPackage(pkgPath, pkg)
+	if err != nil {
+		return nil, err
+	}
+
+	integrity, shasum, err := p.createHashes(pkgArchive)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Package{
+		ID:   pkg.Name,
+		Name: pkg.Name,
+		DistTags: DistTags{
+			Latest: pkg.Version,
+		},
+		Versions: map[string]Version{
+			pkg.Version: {
+				ID:           pkg.Name,
+				Name:         pkg.Name,
+				Version:      pkg.Version,
+				Dependencies: pkg.Dependencies,
+				Dist: Dist{
+					Integrity: integrity,
+					Shasum:    shasum,
+					Tarball:   fmt.Sprintf("%s/files/%s", p.internalProxyUrl, filepath.Base(pkgArchive)),
+				},
+			},
+		},
+	}, nil
+}
+
+func (p *Proxy) createPackage(pkgPath string, pkg PackageJson) (string, error) {
+	err := os.MkdirAll(p.pkgCachePath, 0755)
+	if err != nil {
+		return "", err
+	}
+
+	pkgArchive := filepath.Join(p.pkgCachePath, sanitizePkgName(pkg.Name, pkg.Version)+".tar")
+
+	files, err := archiver.FilesFromDisk(nil, map[string]string{
+		pkgPath: ".",
+	})
+
+	if err != nil {
+		return "", err
+	}
+
+	filesFiltered := []archiver.File{}
+
+	filterRegex := regexp.MustCompile(`^node_modules|.git`)
+
+	for _, file := range files {
+		if filterRegex.MatchString(file.NameInArchive) {
+			continue
+		}
+		filesFiltered = append(filesFiltered, file)
+	}
+
+	out, err := os.Create(pkgArchive)
+	if err != nil {
+		return "", err
+	}
+	defer out.Close()
+
+	format := archiver.CompressedArchive{
+		Archival: archiver.Tar{},
+	}
+
+	err = format.Archive(context.Background(), out, filesFiltered)
+	if err != nil {
+		return "", err
+	}
+
+	return pkgArchive, nil
+}
+
+func (p *Proxy) createHashes(pkgArchive string) (string, string, error) {
+	// Open the file
+	file, err := os.Open(pkgArchive)
+	if err != nil {
+		return "", "", err
+	}
+	defer file.Close()
+
+	// Create a new SHA256 hash
+	hash := sha512.New()
+
+	// Copy the file data into the hash
+	if _, err := io.Copy(hash, file); err != nil {
+		return "", "", err
+	}
+
+	// Get the hash sum
+	hashSum := hash.Sum(nil)
+
+	// Generate the integrity string (SHA-256 base64-encoded)
+	integrity := "sha512-" + base64.StdEncoding.EncodeToString(hashSum)
+
+	// Generate the shasum (hexadecimal representation)
+	shasum := fmt.Sprintf("%x", hashSum)
+
+	return integrity, shasum, nil
+}
+
+// Replace all characters of the pages name that are not allowed in a URL with a hyphen.
+func sanitizePkgName(pkgName string, version string) string {
+	pkgName = strings.ReplaceAll(pkgName, "@", "")
+	pkgName = strings.ReplaceAll(pkgName, "/", "_")
+	version = strings.ReplaceAll(version, ".", "_")
+	return fmt.Sprintf("%s_%s", pkgName, version)
+}
diff --git a/npmproxy/types.go b/npmproxy/types.go
new file mode 100644
index 0000000..f46ae03
--- /dev/null
+++ b/npmproxy/types.go
@@ -0,0 +1,51 @@
+package npmproxy
+
+type PackageJson struct {
+	Name         string            `json:"name"`
+	Version      string            `json:"version"`
+	Dependencies map[string]string `json:"dependencies"`
+}
+
+type Package struct {
+	ID          string             `json:"_id"`
+	Name        string             `json:"name"`
+	Description string             `json:"description"`
+	DistTags    DistTags           `json:"dist-tags"`
+	Versions    map[string]Version `json:"versions"`
+	Readme      string             `json:"readme"`
+	Repository  Repository         `json:"repository"`
+	Author      Author             `json:"author"`
+	License     string             `json:"license"`
+}
+
+type DistTags struct {
+	Latest string `json:"latest"`
+}
+
+type Author struct {
+	Name string `json:"name"`
+}
+
+type Repository struct {
+	Type string `json:"type"`
+	URL  string `json:"url"`
+}
+
+type Dist struct {
+	Integrity string `json:"integrity"`
+	Shasum    string `json:"shasum"`
+	Tarball   string `json:"tarball"`
+}
+
+type Version struct {
+	ID           string            `json:"_id"`
+	Name         string            `json:"name"`
+	Version      string            `json:"version"`
+	Description  string            `json:"description"`
+	Author       Author            `json:"author"`
+	License      string            `json:"license"`
+	Repository   Repository        `json:"repository"`
+	Dependencies map[string]string `json:"dependencies"`
+	Readme       string            `json:"readme"`
+	Dist         Dist              `json:"dist"`
+}
diff --git a/templates.go b/templates.go
index e2535b8..dae2463 100644
--- a/templates.go
+++ b/templates.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/Iilun/survey/v2"
 	"github.com/kataras/golog"
+	"github.com/trading-peter/gowebbuild/fsutils"
 	"github.com/urfave/cli/v2"
 )
 
@@ -80,7 +81,7 @@ func tplAction(ctx *cli.Context) error {
 		golog.Fatal("Invalid template")
 	}
 
-	if isFile(fileName) {
+	if fsutils.IsFile(fileName) {
 		fmt.Printf("File \"%s\" already exists.\n", fileName)
 		return nil
 	}
diff --git a/watch.go b/watch.go
index 5d4a18c..aa8b936 100644
--- a/watch.go
+++ b/watch.go
@@ -3,9 +3,7 @@ package main
 import (
 	"fmt"
 	"os"
-	"os/signal"
 	"path/filepath"
-	"syscall"
 	"time"
 
 	"github.com/jaschaephraim/lrserver"
@@ -23,9 +21,6 @@ func watchAction(ctx *cli.Context) error {
 	os.Chdir(filepath.Dir(cfgPath))
 	optsSetups := readCfg(cfgPath)
 
-	c := make(chan os.Signal, 1)
-	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
-
 	for i := range optsSetups {
 		opts := optsSetups[i]
 
@@ -108,7 +103,7 @@ func watchAction(ctx *cli.Context) error {
 	}
 
 	go func() {
-		fmt.Println("Starting live reload server")
+		fmt.Println("Starting live reload server.")
 		port := ctx.Uint("lr-port")
 		lr := lrserver.New(lrserver.DefaultName, uint16(port))
 
@@ -126,8 +121,9 @@ func watchAction(ctx *cli.Context) error {
 		}
 	}()
 
-	<-c
-	fmt.Println("\nStopped watching")
+	runProxy(ctx.Context, filepath.Dir(cfgPath), optsSetups)
+	<-ctx.Done()
+	fmt.Println("Stopped watching.")
 
 	return nil
 }