JSON Formatter & Validator

What is JSON Formatter?

JSON Formatter is a free online tool that formats, minifies, and validates JSON data. Paste your raw or minified JSON and instantly get clean, indented output with syntax highlighting. All processing happens in your browser — no data is sent to any server.

Common Use Cases

• Debugging API Responses — Paste raw JSON from API calls or browser dev tools to make it readable. Quickly spot missing fields, incorrect types, or unexpected nesting in your data.
• Validating Configuration Files — Check that your JSON config files (package.json, tsconfig.json, etc.) are syntactically correct before deploying. The validator pinpoints the exact position of errors.
• Minifying JSON for Production — Reduce JSON payload size by removing whitespace and formatting. Useful for embedding JSON in URLs, localStorage, or minimizing network transfer size.