JSON Validator
Paste any JSON — an API payload, a config file, a log line — and get instant syntax checking with the exact line and column of any error. It runs entirely in your browser, so sensitive payloads never leave your machine.
Results
Results appear here as you type.
100% private — validation runs entirely in your browser. Your input is never uploaded.
{
"service": "payments-api",
"replicas": 3,
"env": "production",
"limits": { "cpu": "500m", "memory": "512Mi" },
"featureFlags": ["retry-v2", "idempotency-keys"]
} What it checks
- • Syntax errors located to the line and column.
- • Trailing commas — valid in JS, invalid in JSON.
- • Unquoted or single-quoted keys/strings.
- • Unescaped control characters and bad escapes.
- • Reports the detected shape (object, array, and element/key counts).
Keep going
- • YAML validator — syntax + Kubernetes linting.
- • All validators — Terraform, GitLab CI, NGINX.
- • DevOps troubleshooting guides on the blog.