Free JSON Formatter & Validator Online
JSON (JavaScript Object Notation) is the format most apps and APIs use to exchange data — lightweight, text-based, and readable once it's laid out properly. Formatting indents it so you can actually read the structure; validating catches the stray comma or bracket that breaks it. And because JSON often needs to move into a spreadsheet, a config file, or typed code, this tool also converts JSON to CSV, XML, YAML, and TypeScript in a click.
Frequently Asked Questions
- Is the JSON formatter completely free?
- Yes — completely free, no signup, no usage limits.
- Does my JSON data stay private?
- All processing happens in your browser. Your data never leaves your device or reaches our servers.
- Can it fix malformed JSON?
- Yes. Auto-Repair corrects common mistakes like trailing commas, JavaScript-style comments, single-quoted strings, and unquoted keys.
- What can I convert JSON to?
- Use the Converters tab to export JSON as CSV, YAML, XML, or TypeScript interface types.