JSON Formatter & Validator
Format, validate, and minify JSON instantly in your browser. No uploads, no backend processing, and no unnecessary complexity.
What is JSON formatting?
JSON formatting transforms compact or messy JSON into a structured layout with indentation and line breaks. It improves readability, makes debugging easier, and helps teams review payloads faster.
How to validate JSON
Validation checks whether JSON follows strict syntax rules. If there is a structural issue, the parser returns an error. Use Validate to verify payload integrity before using data in APIs, config files, or automation flows.
Common JSON errors
- Missing commas between key-value pairs
- Trailing commas after the last item
- Unquoted object keys
- Invalid string escaping
- Mismatched braces or brackets
Why use an online JSON formatter?
A browser-based formatter is quick, portable, and frictionless. You can clean payloads without installing extra software, and this tool runs fully client-side to keep your data on your device.
FAQ
Is this JSON formatter free?
Yes. The formatter and validator are free to use.
Does it store my data?
No. Processing happens in your browser and no JSON is uploaded.
How do I minify JSON?
Paste your JSON and click Minify to remove unnecessary whitespace.
What makes JSON invalid?
Issues like trailing commas, missing quotes, or mismatched brackets can break JSON syntax.