JSON Formatter
Validate, format, and minify JSON data instantly in your browser.
Related Guide
How to Format JSON Online for Free
About This Tool
Free JSON formatter and validator online — paste raw, minified, or malformed JSON and instantly get it formatted with proper indentation, syntax highlighting, and error messages pinpointing exactly where the JSON is invalid. Also minifies JSON back to a compact single line for production use. 100% browser-based: your JSON never leaves your device. Developers use this tool daily to debug API responses, inspect configuration files, validate JSON schemas before committing, and make minified JSON readable for code review. The formatter supports nested objects and arrays of any depth and handles very large JSON documents. Paste your JSON, fix errors using the highlighted line numbers, then copy the formatted output.
How to Use
- 1
Paste your JSON
Paste raw, minified, or malformed JSON into the input field.
- 2
Format or Minify
Click Format to beautify with indentation, or Minify to compress to a single line.
- 3
Fix errors
If your JSON has errors, the tool highlights the problem and shows an error message. Fix the issue and reformat.
- 4
Copy the output
Copy the formatted or minified JSON to your clipboard.