diff --git a/.github/workflows/json-schema-validation.yaml b/.github/workflows/json-schema-validation.yaml
new file mode 100644
index 0000000..9b9f01a
--- /dev/null
+++ b/.github/workflows/json-schema-validation.yaml
@@ -0,0 +1,38 @@
+# This workflow validates the JSON schema of the cluster-app, which is located in
+# `helm/*/values.schema.json`, using schemalint. It also ensures that the `values.yaml`
+# file located in `helm/*/values.yaml` is generated with helm-values-gen, using the
+# defaults defined in the JSON schema.
+
+name: JSON schema validation
+
+on:
+  workflow_call: {}
+
+permissions: {}
+
+jobs:
+  validate:
+    name: Verify values.schema.json with schemalint
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Run schemalint
+        id: run-schemalint
+        uses: giantswarm/schemalint/actions/verify-helm-schema@5d64fa08da5ef5d593b0298a1ebb6c0e02dfa0b6 # v2.6.1
+        with:
+          rule-set: 'cluster-app'
+  generate:
+    name: Check that values.yaml is generated from values.schema.json with helm-values-gen
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Run helm-values-gen
+        id: run-helm-values-gen
+        uses: giantswarm/helm-values-gen/actions/ensure-generated@6b3fba3fca3e197dd57767eb7245d4f7b3fec21f  # v1.0.4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac9c503..ac69e8a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ Instead this file uses a date-based structure.
 
 ### Added
 
+- Add reusable workflow `json-schema-validation.yaml`.
 - Add reusable workflow `cluster-values-validation.yaml`.
 - Add reusable workflow `helm-render-diff.yaml`.
 - Add reusable workflow `update-chart.yaml`.