JSON Formatter & Validator

JSON Formatter & Validator takes minified or messy JSON and restructures it into properly indented, color-coded output that you can actually read. Paste a webhook payload from Stripe, a GraphQL response, or a Kubernetes manifest and the tool immediately tells you whether the structure is valid — and if not, exactly which line and character broke. The parser surfaces specific error types: missing commas, trailing commas, unquoted keys, single-quote strings, and unescaped control characters. Each error message points to the exact position, so you spend seconds debugging instead of scanning hundreds of lines. The tree view lets you collapse nested objects and arrays, which is invaluable when navigating deep API responses from services like AWS or GitHub. Use cases come up constantly during development: inspecting fetch() responses in the browser console, verifying config files before deployment, comparing API request and response bodies, preparing fixture data for unit tests, or cleaning up JSON exported from a database. The indentation width is adjustable (2, 4, or tab), and you can minify output back to a single line for production payloads where byte count matters. Everything runs through the browser's native JSON.parse — no external libraries, no network calls. Large payloads from production APIs work without freezing. Copy the formatted result with one keystroke or download it as a .json file for your test suite.