Format JSON

JSON is the most common format for structured data between programs, but in transit it is often squeezed into a single long line that no human can read. This tool brings it back into shape: it parses the JSON and returns it neatly indented, so nesting, lists and objects are visible at a glance. The other way round you can also minify it - every superfluous space removed - when it should be small and fast to transmit.

You choose the indentation (two or four spaces or a tab) and can have the keys of each object sorted alphabetically. Sorting is useful to make two JSON documents comparable or to produce stable, reproducible output. Because the tool genuinely parses and re-serializes the JSON, the output is always valid JSON; broken input is not silently repaired but reported honestly as an error.

All processing runs entirely locally in your browser in pure JavaScript - your JSON is not uploaded, not stored, and no foreign library is loaded from a CDN. That matters precisely for configurations, API responses or exports, which quickly contain confidential values. You can download the result or copy it straight out.

Specifications

In 3 steps

1. Paste the JSON into the text field.
2. Choose the indent, optionally sort keys or minify.
3. Read or download the formatted JSON.

Limitations: The tool reformats valid JSON per RFC 8259; it does not repair broken syntax or add missing quotation marks. Comments are not allowed in JSON and lead to an honest error. Very large documents are limited by your device memory. The order of array elements is always preserved; only object keys are sorted.

FAQ

Related tools

• Change case
• Sort lines
• Regex tester
• Escape JSON