What is JSON Formatter?
JSON Formatter is a free online tool that pretty-prints messy JSON with indentation, minifies it, and validates it with clear error messages. Ideal for debugging API responses and config files.
Format and minify JSON online with validation. Clean messy payloads before debugging — free JSON beautifier on Fah Swe Tools.
Key features
- Pretty print (beautify) JSON
- Minify JSON
- Validation with error location
- Private — nothing stored
Popular uses
- Read API responses easily
- Fix invalid JSON config files
- Shrink JSON for production
Also known as: JSON Beautifier, JSON Validator, JSON Pretty Print, JSON Minifier.
How it works
- Paste JSON.
- Format or minify.
- Fix errors shown by the validator.
FAQ
Max size?
500 KB of text.
Why is my JSON invalid?
Common causes are trailing commas, single quotes instead of double quotes and missing brackets.
What is the difference between beautify and minify?
Beautify adds indentation for reading; minify removes whitespace to reduce size.