diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..aada95f
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+insert_final_newline = true
+end_of_line = lf
+indent_style = space
+indent_size = 2
+max_line_length = 80
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..fd77750
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  pull_request:
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  prettier:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@1d0ff469b7ec7b3cb9d8673fde0c81c44821de2a # v4.2.0
+        with:
+          node-version: 22.14.0
+          cache: pnpm
+
+      - name: Install dev dependencies
+        run: pnpm install --frozen-lockfile --dev
+
+      - run: pnpm run prettier:check
diff --git a/.gitignore b/.gitignore
index 485dee6..7a1537b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 .idea
+node_modules
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..d93a75a
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1,2 @@
+public-hoist-pattern[]=*eslint*
+public-hoist-pattern[]=*prettier*
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..bd5535a
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1 @@
+pnpm-lock.yaml
diff --git a/.prettierrc.js b/.prettierrc.js
new file mode 100644
index 0000000..d3f5e1e
--- /dev/null
+++ b/.prettierrc.js
@@ -0,0 +1,10 @@
+/**
+ * @see https://prettier.io/docs/configuration
+ * TODO migrate to TS when node lts supports it without flags
+ * @type {import("prettier").Config}
+ */
+const config = {
+  plugins: ["prettier-plugin-sort-json"],
+};
+
+export default config;
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..75a7eb4
--- /dev/null
+++ b/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "backstage-renovate-config",
+  "packageManager": "pnpm@10.4.1",
+  "volta": {
+    "node": "22.14.0",
+    "pnpm": "10.4.1"
+  },
+  "type": "module",
+  "scripts": {
+    "prettier:check": "prettier --check .",
+    "prettier:fix": "prettier --write ."
+  },
+  "devDependencies": {
+    "prettier": "3.5.2",
+    "prettier-plugin-sort-json": "4.1.1"
+  }
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
new file mode 100644
index 0000000..0b4f5e2
--- /dev/null
+++ b/pnpm-lock.yaml
@@ -0,0 +1,37 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    devDependencies:
+      prettier:
+        specifier: 3.5.2
+        version: 3.5.2
+      prettier-plugin-sort-json:
+        specifier: 4.1.1
+        version: 4.1.1(prettier@3.5.2)
+
+packages:
+
+  prettier-plugin-sort-json@4.1.1:
+    resolution: {integrity: sha512-uJ49wCzwJ/foKKV4tIPxqi4jFFvwUzw4oACMRG2dcmDhBKrxBv0L2wSKkAqHCmxKCvj0xcCZS4jO2kSJO/tRJw==}
+    engines: {node: '>=18.0.0'}
+    peerDependencies:
+      prettier: ^3.0.0
+
+  prettier@3.5.2:
+    resolution: {integrity: sha512-lc6npv5PH7hVqozBR7lkBNOGXV9vMwROAPlumdBkX0wTbbzPu/U1hk5yL8p2pt4Xoc+2mkT8t/sow2YrV/M5qg==}
+    engines: {node: '>=14'}
+    hasBin: true
+
+snapshots:
+
+  prettier-plugin-sort-json@4.1.1(prettier@3.5.2):
+    dependencies:
+      prettier: 3.5.2
+
+  prettier@3.5.2: {}