diff --git a/.github/workflows/runner.yml b/.github/workflows/runner.yml
index eac61d73..a5eef6d4 100644
--- a/.github/workflows/runner.yml
+++ b/.github/workflows/runner.yml
@@ -23,6 +23,17 @@ jobs:
         run: python -m mypy --config-file mypy.ini -p ethstaker_deposit
       - name: Run linter
         run: flake8 --config=flake8.ini ./ethstaker_deposit ./tests
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'latest'
+      - name: Install jsonlint
+        run: npm install -g @prantlf/jsonlint
+      - name: Validate JSON files
+        run: |
+          for file in $(find ./ethstaker_deposit/intl -name "*.json"); do
+            jsonlint --no-duplicate-keys --quiet --compact $file
+          done
   ci-runner:
     needs: lint
     if: |
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3da1d0bf..74ee128f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -18,3 +18,8 @@ repos:
         - ssz==0.5.0
       files: ^ethstaker_deposit/
       args: [--config-file, mypy.ini]
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: 'v4.6.0'
+    hooks:
+    - id: check-json
+      files: ^ethstaker_deposit/intl