diff --git a/.github/workflows/ci-node18.yml b/.github/workflows/ci-node18.yml
new file mode 100644
index 0000000..fb3f38f
--- /dev/null
+++ b/.github/workflows/ci-node18.yml
@@ -0,0 +1,36 @@
+name: CI - Node 18
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js 18
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: TypeScript type checking
+        run: npm run type-check
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Run tests
+        env:
+          CI: true
+          NODE_ENV: test
+        run: npm test
+
+      - name: Build package
+        run: npm run build
diff --git a/.github/workflows/ci-node20.yml b/.github/workflows/ci-node20.yml
new file mode 100644
index 0000000..ee1f47c
--- /dev/null
+++ b/.github/workflows/ci-node20.yml
@@ -0,0 +1,36 @@
+name: CI - Node 20
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js 20
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: TypeScript type checking
+        run: npm run type-check
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Run tests
+        env:
+          CI: true
+          NODE_ENV: test
+        run: npm test
+
+      - name: Build package
+        run: npm run build
diff --git a/.github/workflows/ci-node22.yml b/.github/workflows/ci-node22.yml
new file mode 100644
index 0000000..ef33102
--- /dev/null
+++ b/.github/workflows/ci-node22.yml
@@ -0,0 +1,44 @@
+name: CI - Node 22
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js 22
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: TypeScript type checking
+        run: npm run type-check
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Run tests with coverage
+        env:
+          CI: true
+          NODE_ENV: test
+        run: npm run coverage
+
+      - name: Build package
+        run: npm run build
+
+      - name: Upload coverage reports
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          directory: ./coverage
+          name: coverage
+          fail_ci_if_error: false
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 44ce511..5ad70ed 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,118 +11,19 @@ permissions:
   pull-requests: write
 
 jobs:
-  test:
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version: [18, 20, 22]
-
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          fetch-depth: 0
-
-      - name: Setup Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
-        with:
-          node-version: ${{ matrix.node-version }}
-          cache: 'npm'
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: TypeScript type checking
-        run: npm run lint
-
-      - name: Format check
-        run: npm run format:check
-
-      - name: Run tests with coverage
-        env:
-          CI: true
-          NODE_ENV: test
-        run: npm run coverage
-
-      - name: Build package
-        run: npm run build
-
-      - name: Upload coverage reports
-        if: matrix.node-version == 22
-        uses: codecov/codecov-action@v4
-        with:
-          directory: ./coverage
-          name: coverage
-          fail_ci_if_error: false
-
-  # Auto-format job (only runs on Node 22, separate from matrix)
   format:
-    runs-on: ubuntu-latest
-    needs: test
-    if: failure() == false
-
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          fetch-depth: 0
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '22'
-          cache: 'npm'
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Format code with Prettier
-        run: npm run format
-
-      - name: Check for formatting changes
-        id: verify-changed-files
-        run: |
-          if [ -n "$(git status --porcelain)" ]; then
-            echo "changed=true" >> $GITHUB_OUTPUT
-          else
-            echo "changed=false" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Check if fork PR
-        id: check-fork
-        if: steps.verify-changed-files.outputs.changed == 'true'
-        run: |
-          if [ "${{ github.event_name }}" == "pull_request" ] && [ "${{ github.event.pull_request.head.repo.full_name }}" != "${{ github.repository }}" ]; then
-            echo "is_fork=true" >> $GITHUB_OUTPUT
-          else
-            echo "is_fork=false" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Warn about fork PRs
-        if: steps.verify-changed-files.outputs.changed == 'true' && steps.check-fork.outputs.is_fork == 'true'
-        run: |
-          echo "::warning::Formatting changes detected in fork PR. Please run 'npm run format' locally and push the changes."
+    uses: ./.github/workflows/format.yml
+    secrets: inherit
 
-      - name: Commit formatting changes
-        if: steps.verify-changed-files.outputs.changed == 'true' && steps.check-fork.outputs.is_fork == 'false'
-        env:
-          BRANCH_NAME: ${{ github.head_ref }}
-          REF_NAME: ${{ github.ref_name }}
-        run: |
-          set -e
-          git config --local user.email "action@github.com"
-          git config --local user.name "GitHub Action"
-          git add .
-          git commit -m "Auto-format code with Prettier
+  test-node18:
+    needs: format
+    uses: ./.github/workflows/ci-node18.yml
 
-          This commit was automatically generated by GitHub Actions
-          to ensure consistent code formatting across the project."
+  test-node20:
+    needs: format
+    uses: ./.github/workflows/ci-node20.yml
 
-          if [ "${{ github.event_name }}" == "pull_request" ]; then
-            git push origin HEAD:"$BRANCH_NAME"
-          else
-            git push origin HEAD:"$REF_NAME"
-          fi
+  test-node22:
+    needs: format
+    uses: ./.github/workflows/ci-node22.yml
+    secrets: inherit
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
new file mode 100644
index 0000000..25643cb
--- /dev/null
+++ b/.github/workflows/format.yml
@@ -0,0 +1,78 @@
+name: Format
+
+on:
+  workflow_call:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Format code with Prettier
+        run: npm run format
+
+      - name: Check for formatting changes
+        id: verify-changed-files
+        run: |
+          if [ -n "$(git status --porcelain)" ]; then
+            echo "changed=true" >> $GITHUB_OUTPUT
+          else
+            echo "changed=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Check if fork PR
+        id: check-fork
+        if: steps.verify-changed-files.outputs.changed == 'true'
+        run: |
+          if [ "${{ github.event_name }}" == "pull_request" ] && [ "${{ github.event.pull_request.head.repo.full_name }}" != "${{ github.repository }}" ]; then
+            echo "is_fork=true" >> $GITHUB_OUTPUT
+          else
+            echo "is_fork=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Warn about fork PRs
+        if: steps.verify-changed-files.outputs.changed == 'true' && steps.check-fork.outputs.is_fork == 'true'
+        run: |
+          echo "::warning::Formatting changes detected in fork PR. Please run 'npm run format' locally and push the changes."
+          exit 1
+
+      - name: Commit formatting changes
+        if: steps.verify-changed-files.outputs.changed == 'true' && steps.check-fork.outputs.is_fork == 'false'
+        env:
+          BRANCH_NAME: ${{ github.head_ref }}
+          REF_NAME: ${{ github.ref_name }}
+        run: |
+          set -e
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git add .
+          git commit -m "Auto-format code with Prettier
+
+          This commit was automatically generated by GitHub Actions
+          to ensure consistent code formatting across the project."
+
+          if [ "${{ github.event_name }}" == "pull_request" ]; then
+            git push origin HEAD:"$BRANCH_NAME"
+          else
+            git push origin HEAD:"$REF_NAME"
+          fi
diff --git a/README.md b/README.md
index 1ff4f11..700bec2 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # @jackmisner/utm-toolkit
 
+[![CI](https://github.com/jackmisner/utm-toolkit/actions/workflows/ci.yml/badge.svg)](https://github.com/jackmisner/utm-toolkit/actions/workflows/ci.yml)
+
 A comprehensive TypeScript library for capturing, storing, and appending UTM tracking parameters. Framework-agnostic core with optional React integration.
 
 ## Features
diff --git a/package-lock.json b/package-lock.json
index a3c467d..8be57d5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "@types/react": "^18.0.0",
         "@vitest/coverage-v8": "^2.0.0",
         "jsdom": "^25.0.0",
+        "oxlint": "^1.0.0",
         "prettier": "^3.0.0",
         "react": "^18.0.0",
         "react-dom": "^18.0.0",
@@ -715,6 +716,118 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@oxlint/darwin-arm64": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/darwin-arm64/-/darwin-arm64-1.41.0.tgz",
+      "integrity": "sha512-K0Bs0cNW11oWdSrKmrollKF44HMM2HKr4QidZQHMlhJcSX8pozxv0V5FLdqB4sddzCY0J9Wuuw+oRAfR8sdRwA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ]
+    },
+    "node_modules/@oxlint/darwin-x64": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/darwin-x64/-/darwin-x64-1.41.0.tgz",
+      "integrity": "sha512-1LCCXCe9nN8LbrJ1QOGari2HqnxrZrveYKysWDIg8gFsQglIg00XF/8lRbA0kWHMdLgt4X0wfNYhhFz+c3XXLQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ]
+    },
+    "node_modules/@oxlint/linux-arm64-gnu": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/linux-arm64-gnu/-/linux-arm64-gnu-1.41.0.tgz",
+      "integrity": "sha512-Fow7H84Bs8XxuaK1yfSEWBC8HI7rfEQB9eR2A0J61un1WgCas7jNrt1HbT6+p6KmUH2bhR+r/RDu/6JFAvvj4g==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@oxlint/linux-arm64-musl": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/linux-arm64-musl/-/linux-arm64-musl-1.41.0.tgz",
+      "integrity": "sha512-WoRRDNwgP5W3rjRh42Zdx8ferYnqpKoYCv2QQLenmdrLjRGYwAd52uywfkcS45mKEWHeY1RPwPkYCSROXiGb2w==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@oxlint/linux-x64-gnu": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/linux-x64-gnu/-/linux-x64-gnu-1.41.0.tgz",
+      "integrity": "sha512-75k3CKj3fOc/a/2aSgO81s3HsTZOFROthPJ+UI2Oatic1LhvH6eKjKfx3jDDyVpzeDS2qekPlc/y3N33iZz5Og==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@oxlint/linux-x64-musl": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/linux-x64-musl/-/linux-x64-musl-1.41.0.tgz",
+      "integrity": "sha512-8r82eBwGPoAPn67ZvdxTlX/Z3gVb+ZtN6nbkyFzwwHWAh8yGutX+VBcVkyrePSl6XgBP4QAaddPnHmkvJjqY0g==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ]
+    },
+    "node_modules/@oxlint/win32-arm64": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/win32-arm64/-/win32-arm64-1.41.0.tgz",
+      "integrity": "sha512-aK+DAcckQsNCOXKruatyYuY/ROjNiRejQB1PeJtkZwM21+8rV9ODYbvKNvt0pW+YCws7svftBSFMCpl3ke2unw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
+    "node_modules/@oxlint/win32-x64": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/@oxlint/win32-x64/-/win32-x64-1.41.0.tgz",
+      "integrity": "sha512-dVBXkZ6MGLd3owV7jvuqJsZwiF3qw7kEkDVsYVpS/O96eEvlHcxVbaPjJjrTBgikXqyC22vg3dxBU7MW0utGfw==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
     "node_modules/@pkgjs/parseargs": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
@@ -2300,6 +2413,40 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/oxlint": {
+      "version": "1.41.0",
+      "resolved": "https://registry.npmjs.org/oxlint/-/oxlint-1.41.0.tgz",
+      "integrity": "sha512-Dyaoup82uhgAgp5xLNt4dPdvl5eSJTIzqzL7DcKbkooUE4PDViWURIPlSUF8hu5a+sCnNIp/LlQMDsKoyaLTBA==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "oxlint": "bin/oxlint"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      },
+      "optionalDependencies": {
+        "@oxlint/darwin-arm64": "1.41.0",
+        "@oxlint/darwin-x64": "1.41.0",
+        "@oxlint/linux-arm64-gnu": "1.41.0",
+        "@oxlint/linux-arm64-musl": "1.41.0",
+        "@oxlint/linux-x64-gnu": "1.41.0",
+        "@oxlint/linux-x64-musl": "1.41.0",
+        "@oxlint/win32-arm64": "1.41.0",
+        "@oxlint/win32-x64": "1.41.0"
+      },
+      "peerDependencies": {
+        "oxlint-tsgolint": ">=0.11.1"
+      },
+      "peerDependenciesMeta": {
+        "oxlint-tsgolint": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/package-json-from-dist": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/package-json-from-dist/-/package-json-from-dist-1.0.1.tgz",
diff --git a/package.json b/package.json
index 39190c4..cc2af0b 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,9 @@
     "test": "vitest run",
     "test:watch": "vitest",
     "coverage": "vitest run --coverage",
-    "lint": "tsc --noEmit",
+    "type-check": "tsc --noEmit",
+    "lint": "oxlint",
+    "lint:fix": "oxlint --fix",
     "format": "prettier --write \"src/**/*.{ts,tsx}\" \"__tests__/**/*.{ts,tsx}\"",
     "format:check": "prettier --check \"src/**/*.{ts,tsx}\" \"__tests__/**/*.{ts,tsx}\"",
     "prepublishOnly": "npm run clean && npm run build && npm run test"
@@ -60,6 +62,7 @@
     "@types/react": "^18.0.0",
     "@vitest/coverage-v8": "^2.0.0",
     "jsdom": "^25.0.0",
+    "oxlint": "^1.0.0",
     "prettier": "^3.0.0",
     "react": "^18.0.0",
     "react-dom": "^18.0.0",
diff --git a/src/config/loader.ts b/src/config/loader.ts
index b3442b2..e4b6c3f 100644
--- a/src/config/loader.ts
+++ b/src/config/loader.ts
@@ -24,7 +24,7 @@ function mergeShareContextParams(
     if (value !== undefined) {
       // Merge platform-specific params with base
       result[key] = {
-        ...(base[key] || {}),
+        ...base[key],
         ...value,
       }
     }