JSON Formatter
Format, validate, and minify JSON with clear syntax error locations.
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JSON Formatter — Format, Validate & Minify JSON
Format messy JSON into readable, indented output, catch syntax errors with the exact line and column, or minify it for production. Runs entirely in your browser.
Quick answer: JSON Formatter
JSON Formatter cleans up messy or minified JSON into readable, indented output, and flags syntax errors with the exact line and column instead of a vague parser message. Paste your JSON, pick an indent width, and copy or download the result.
- Input
- Any JSON text — an API response, a config file, minified output.
- Output
- Pretty-printed or minified JSON, or a precise error location if it's invalid.
- Know before use
- Very large JSON (tens of MB) can slow down or freeze the tab since parsing happens on the main thread; split large files first.
- ✓100% free, no sign-up required
- ✓Runs entirely in your browser — no file upload to server
- ✓Points to the exact line and column of a syntax error
- ✓Sort keys and choose 2-space, 4-space, or tab indentation
- ✓Privacy-first: your data never leaves your device
How to Use
- 1Prepare the input
Any JSON text — an API response, a config file, minified output.
- 2Configure and process
JSON Formatter cleans up messy or minified JSON into readable, indented output, and flags syntax errors with the exact line and column instead of a vague parser message. Paste your JSON, pick an indent width, and copy or download the result.
- 3Review the result
Pretty-printed or minified JSON, or a precise error location if it's invalid.
What do I need to use JSON Formatter?
Any JSON text — an API response, a config file, minified output.
What does JSON Formatter produce?
Pretty-printed or minified JSON, or a precise error location if it's invalid.
What are the limitations of JSON Formatter?
Very large JSON (tens of MB) can slow down or freeze the tab since parsing happens on the main thread; split large files first.