diff --git a/npm/npm-diff/action.yaml b/npm/npm-diff/action.yaml
index 0f1c61a..6b4633f 100644
--- a/npm/npm-diff/action.yaml
+++ b/npm/npm-diff/action.yaml
@@ -23,7 +23,7 @@ inputs:
   registry:
     description: "NPM registry URL."
     required: false
-    default: "https://npm.pkg.github.com"
+    default: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json
   authToken:
     description: "Authentication token for the registry."
     required: true
diff --git a/npm/npm-get-next-branched-version/action.yaml b/npm/npm-get-next-branched-version/action.yaml
index 8579953..db58147 100644
--- a/npm/npm-get-next-branched-version/action.yaml
+++ b/npm/npm-get-next-branched-version/action.yaml
@@ -11,7 +11,7 @@ inputs:
   registry:
     description: "NPM registry URL."
     required: false
-    default: "https://npm.pkg.github.com"
+    default: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json
   authToken:
     description: "Authentication token for the registry."
     required: true
diff --git a/npm/npm-install/action.yaml b/npm/npm-install/action.yaml
index eb3455b..72339a2 100644
--- a/npm/npm-install/action.yaml
+++ b/npm/npm-install/action.yaml
@@ -19,7 +19,7 @@ inputs:
   registry:
     description: "NPM registry URL."
     required: false
-    default: "https://npm.pkg.github.com"
+    default: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json
   authToken:
     description: "Authentication token for the registry."
     required: true
diff --git a/npm/npm-pack-and-compare/action.yaml b/npm/npm-pack-and-compare/action.yaml
new file mode 100644
index 0000000..b8768d5
--- /dev/null
+++ b/npm/npm-pack-and-compare/action.yaml
@@ -0,0 +1,101 @@
+name: npm-pack-and-compare
+description: "Build and pack an NPM package into a .tgz file."
+inputs:
+  name:
+    description: "The name of the package."
+    required: true
+  workingDirectory:
+    description: "Working directory containing package.json."
+    required: false
+    default: "."
+  nodeVersion:
+    description: "Node.js version to use."
+    required: false
+    default: "20"
+  buildScript:
+    description: "Build script to run before packing (e.g., 'build' for 'npm run build'). Set to empty string to skip build step."
+    required: false
+    default: "build"
+  defaultVersion:
+    description: "Version of the package."
+    required: true
+    default: "1.0.0"
+  outputDirectory:
+    description: "Directory for the output .tgz."
+    required: true
+    default: "out"
+  registry:
+    description: "NPM registry URL."
+    required: false
+    default: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json
+  authToken:
+    description: "Authentication token for the registry."
+    required: true
+  skipCompare:
+    description: "Skip in-depth comparison."
+    required: true
+    default: "false"
+outputs:
+  tgz:
+    description: "The generated output .tgz file."
+    value: ${{ steps.package.outputs.tgz }}
+  tgzName:
+    description: "The generated output .tgz file's name."
+    value: ${{ steps.package.outputs.tgzName }}
+  hasChanged:
+    description: "Whether or not the package files match."
+    value: ${{ !steps.npm.outputs.latestVersion || inputs.skipCompare == 'true' || steps.compare.outputs.hasDifferences == 'true' }}
+runs:
+  using: "composite"
+  steps:
+  - name: "Get the next version of the package."
+    uses: act/common/npm/npm-get-next-branched-version@master
+    id: npm
+    with:
+      name: ${{ inputs.name }}
+      defaultVersion: ${{ inputs.defaultVersion }}
+      registry: ${{ inputs.registry }}
+      authToken: ${{ inputs.authToken }}
+  - name: "Pack with latest version for comparison"
+    if: ${{ steps.npm.outputs.latestVersion && inputs.skipCompare == 'false' }}
+    id: pack_comparison
+    uses: act/common/npm/npm-pack@master
+    with:
+      version: ${{ steps.npm.outputs.latestVersion }}
+      workingDirectory: ${{ inputs.workingDirectory }}
+      nodeVersion: ${{ inputs.nodeVersion }}
+      buildScript: ${{ inputs.buildScript }}
+      outputDirectory: ${{ inputs.outputDirectory }}/comparison
+      registry: ${{ inputs.registry }}
+  - name: "Compare to remote package"
+    if: ${{ steps.npm.outputs.latestVersion && inputs.skipCompare == 'false' }}
+    id: compare
+    uses: act/common/npm/npm-diff@master
+    with:
+      name: ${{ inputs.name }}
+      lhsVersion: ${{ steps.npm.outputs.latestVersion }}
+      rhsVersion: ${{ steps.npm.outputs.latestVersion }}
+      workingDirectory: ${{ inputs.workingDirectory }}
+      registry: ${{ inputs.registry }}
+      authToken: ${{ inputs.authToken }}
+      failOnDifferences: "false"
+  - name: "Pack with next version"
+    if: ${{ !steps.npm.outputs.latestVersion || inputs.skipCompare == 'true' || steps.compare.outputs.hasDifferences == 'true' }}
+    id: pack_final
+    uses: act/common/npm/npm-pack@master
+    with:
+      version: ${{ steps.npm.outputs.nextVersion }}
+      workingDirectory: ${{ inputs.workingDirectory }}
+      nodeVersion: ${{ inputs.nodeVersion }}
+      buildScript: ${{ inputs.buildScript }}
+      outputDirectory: ${{ inputs.outputDirectory }}
+      registry: ${{ inputs.registry }}
+      skipInstall: ${{ steps.pack_comparison.conclusion != '' }}
+  - name: "Generate package outputs"
+    id: package
+    run: |
+      TGZ_NAME="${{ inputs.name }}-${{ steps.npm.outputs.nextVersion }}.tgz"
+      TGZ_PATH="${{ inputs.outputDirectory }}/$TGZ_NAME"
+      echo "tgz=$TGZ_PATH" >> "$GITHUB_OUTPUT"
+      echo "tgzName=$TGZ_NAME" >> "$GITHUB_OUTPUT"
+    shell: bash
diff --git a/npm/npm-pack/action.yaml b/npm/npm-pack/action.yaml
new file mode 100644
index 0000000..b81bc7d
--- /dev/null
+++ b/npm/npm-pack/action.yaml
@@ -0,0 +1,79 @@
+name: npm-pack
+description: "Build and pack an NPM package into a .tgz file."
+inputs:
+  version:
+    description: "Version to set in package.json before packing."
+    required: true
+  workingDirectory:
+    description: "Working directory containing package.json."
+    required: false
+    default: "."
+  nodeVersion:
+    description: "Node.js version to use."
+    required: false
+    default: "20"
+  buildScript:
+    description: "Build script to run before packing (e.g., 'build' for 'npm run build'). Set to empty string to skip build step."
+    required: false
+    default: "build"
+  outputDirectory:
+    description: "Directory for the output .tgz."
+    required: true
+    default: "out"
+  registry:
+    description: "NPM registry URL."
+    required: false
+    default: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json
+  skipInstall:
+    description: "Skip npm ci step (dependencies already installed)."
+    required: false
+    default: "false"
+outputs:
+  tgz:
+    description: "The generated output .tgz file."
+    value: ${{ steps.package.outputs.tgz }}
+  tgzName:
+    description: "The generated output .tgz file's name."
+    value: ${{ steps.package.outputs.tgzName }}
+runs:
+  using: "composite"
+  steps:
+  - name: "Setup Node.js"
+    uses: https://github.com/actions/setup-node@v4
+    with:
+      node-version: ${{ inputs.nodeVersion }}
+      cache: npm
+      cache-dependency-path: ${{ inputs.workingDirectory }}/package-lock.json
+      registry-url: ${{ inputs.registry }}
+  - name: "Install dependencies"
+    if: ${{ inputs.skipInstall != 'true' }}
+    run: npm ci
+    working-directory: ${{ inputs.workingDirectory }}
+    shell: bash
+  - name: "Update package version"
+    run: npm version ${{ inputs.version }} --no-git-tag-version
+    working-directory: ${{ inputs.workingDirectory }}
+    shell: bash
+  - name: "Build package"
+    if: ${{ inputs.buildScript != '' }}
+    run: npm run ${{ inputs.buildScript }}
+    working-directory: ${{ inputs.workingDirectory }}
+    shell: bash
+  - name: "Create output directory"
+    run: mkdir -p "${{ inputs.outputDirectory }}"
+    shell: bash
+  - name: "Pack package"
+    run: npm pack --pack-destination "${{ github.workspace }}/${{ inputs.outputDirectory }}"
+    working-directory: ${{ inputs.workingDirectory }}
+    shell: bash
+  - name: "Generate package outputs"
+    id: package
+    run: |
+      # Extract package name from package.json
+      PACKAGE_NAME=$(node -p "require('./package.json').name")
+      TGZ_NAME="$PACKAGE_NAME-${{ inputs.version }}.tgz"
+      TGZ_PATH="${{ inputs.outputDirectory }}/$TGZ_NAME"
+      echo "tgz=$TGZ_PATH" >> "$GITHUB_OUTPUT"
+      echo "tgzName=$TGZ_NAME" >> "$GITHUB_OUTPUT"
+    working-directory: ${{ inputs.workingDirectory }}
+    shell: bash
diff --git a/npm/npm-push/action.yaml b/npm/npm-push/action.yaml
index ae72484..faf72e9 100644
--- a/npm/npm-push/action.yaml
+++ b/npm/npm-push/action.yaml
@@ -7,7 +7,7 @@ inputs:
   registry:
     description: "NPM registry URL."
     required: false
-    default: "https://npm.pkg.github.com"
+    default: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json
   apiKey:
     description: "NPM authentication token."
     required: true
diff --git a/npm/npm-query-versions-latest/action.yaml b/npm/npm-query-versions-latest/action.yaml
index d752809..e4f3d43 100644
--- a/npm/npm-query-versions-latest/action.yaml
+++ b/npm/npm-query-versions-latest/action.yaml
@@ -7,7 +7,7 @@ inputs:
   registry:
     description: "NPM registry URL."
     required: false
-    default: "https://npm.pkg.github.com"
+    default: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json
   authToken:
     description: "Authentication token for the registry."
     required: true
diff --git a/npm/npm-query-versions/action.yaml b/npm/npm-query-versions/action.yaml
index 9ab90ba..cce64e3 100644
--- a/npm/npm-query-versions/action.yaml
+++ b/npm/npm-query-versions/action.yaml
@@ -7,7 +7,7 @@ inputs:
   registry:
     description: "NPM registry URL."
     required: false
-    default: "https://npm.pkg.github.com"
+    default: ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json
   authToken:
     description: "Authentication token for the registry."
     required: true
diff --git a/npm/npm-query-versions/query_versions.sh b/npm/npm-query-versions/query_versions.sh
index 75fa5fa..3deee4f 100644
--- a/npm/npm-query-versions/query_versions.sh
+++ b/npm/npm-query-versions/query_versions.sh
@@ -12,7 +12,7 @@ fi
 
 # Construct the registry URL
 REGISTRY_URL="$REGISTRY"
-if [[ "$REGISTRY" == "https://npm.pkg.github.com" ]]; then
+if [[ "$REGISTRY" == ${{ github.server_url }}/api/packages/${{ github.repository_owner }}/nuget/index.json ]]; then
     # GitHub Packages uses a specific URL format
     REGISTRY_URL="$REGISTRY"
 fi
diff --git a/utils/compare-tgz/action.yaml b/utils/compare-tgz/action.yaml
new file mode 100644
index 0000000..5e8113a
--- /dev/null
+++ b/utils/compare-tgz/action.yaml
@@ -0,0 +1,82 @@
+name: compare-tgz
+description: "Compare the contents of two .tgz files."
+inputs:
+  lhs:
+    description: "Left hand side .tgz file."
+    required: true
+  rhs:
+    description: "Right hand side .tgz file."
+    required: true
+  comparePackageJson:
+    description: "Whether or not to compare the package.json file."
+    required: true
+    default: "false"
+  exitOnFail:
+    description: "Should the program exit on a failure."
+    required: true
+    default: "false"
+  tmpDir:
+    description: "Temporary directory. Default: _tmp"
+    required: true
+    default: _tmp
+outputs:
+  success:
+    description: "The result of the comparison."
+    value: ${{ steps.compare.outputs.success == 'true' && ( inputs.comparePackageJson == 'false' || steps.compare-package-json.outputs.success == 'true' ) }}
+runs:
+  using: "composite"
+  steps:
+  - name: "Make temporary directory for lhs extraction"
+    id: mktemp-lhs
+    uses: act/common/utils/mktemp@master
+    with:
+      outputType: dir
+      tmpDir: ${{ inputs.tmpDir }}
+  - name: "Make temporary directory for rhs extraction"
+    id: mktemp-rhs
+    uses: act/common/utils/mktemp@master
+    with:
+      outputType: dir
+      tmpDir: ${{ inputs.tmpDir }}
+  - name: "Extract lhs."
+    uses: act/common/utils/extract@master
+    with:
+      file: ${{ inputs.lhs }}
+      outputDir: ${{ steps.mktemp-lhs.outputs.tmp }}
+  - name: "Extract rhs."
+    uses: act/common/utils/extract@master
+    with:
+      file: ${{ inputs.rhs }}
+      outputDir: ${{ steps.mktemp-rhs.outputs.tmp }}
+  - name: "Get shasum for lhs."
+    id: lhs-shasum
+    uses: act/common/utils/shasum-files@master
+    with:
+      directory: ${{ steps.mktemp-lhs.outputs.tmp }}
+      pattern: "*"
+  - name: "Get shasum for rhs."
+    id: rhs-shasum
+    uses: act/common/utils/shasum-files@master
+    with:
+      directory: ${{ steps.mktemp-rhs.outputs.tmp }}
+      pattern: "*"
+  - name: "Compare lhs and rhs."
+    id: compare
+    uses: act/common/utils/compare@master
+    with:
+      expected: ${{ steps.lhs-shasum.outputs.sums }}
+      actual: ${{ steps.rhs-shasum.outputs.sums }}
+      exitOnFail: ${{ inputs.exitOnFail }}
+  - name: "Compare package.json files."
+    id: compare-package-json
+    if: ${{ inputs.comparePackageJson == 'true' }}
+    uses: act/common/utils/compare-files@master
+    with:
+      expected: ${{ steps.mktemp-lhs.outputs.tmp }}
+      expectedPattern: /*/package.json
+      actual: ${{ steps.mktemp-rhs.outputs.tmp }}
+      actualPattern: /*/package.json
+      exitOnFail: ${{ inputs.exitOnFail }}
+  - name: "Remove temporary files."
+    run: rm -rf "${{ inputs.tmpDir }}"
+    shell: bash