Prettifies JSON and API response data with configurable indentation, sorting, and syntax validation — fixes malformed JSON and makes nested structures readable.
Content reviewed October 2026 · About Toolzum
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It pretty-prints minified JSON with proper indentation, sorts keys alphabetically (optional), and collapses or expands nested brackets. Malformed JSON gets flagged with the exact line number of the syntax error.
Yes. Select from 2 spaces (default), 4 spaces, tabs, or minified output. The indent setting applies instantly as you switch between options.
Yes. If your JSON has syntax errors — missing commas, trailing braces, unquoted keys — the tool highlights the exact location and describes the error so you can fix it quickly.
Yes. Toggle key sorting to arrange all object keys alphabetically. This is useful for comparing two JSON structures or making large configs easier to navigate.
No. All formatting and validation happens locally in your browser using the JSONLint library. Your data never leaves your device.
The dropped file auto-fills the input as long as it is 1024 x 1024 bytes (1 MB) or smaller; larger files are ignored. Formatting itself offers 3 buttons: Format (2 spaces), Format (4 spaces) and Minify.
Code Formatter
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