Data and developer tool
Free JSON formatter and validator
Paste JSON to validate its syntax, pretty-print it with your chosen indentation, minify it for compact transport, and inspect basic structure details. Aegis processes the input locally in the browser.
Optional recursive key sorting is available when you want deterministic object-key order. Valid output can be copied or downloaded as JSON.
How to format JSON
- Paste JSON. Add an object, array, or other valid JSON value to the input.
- Choose the output mode. Pretty-print for readability or minify for compact output, then choose indentation when formatting.
- Validate and export. Review the parser status and structure metrics, then copy or download the formatted result.
JSON tool features
- Syntax validation using the browser’s JSON parser.
- Pretty output with 2, 4, 6, or 8 spaces.
- Minified output for compact JSON.
- Optional recursive key sorting.
- Root type, line, byte, and depth details.
- Copy and download controls.
JSON formatter FAQ
Common questions
What does a JSON formatter do?
It parses JSON and writes it in a readable layout. Aegis also offers minified output, optional key sorting, validation status, and export controls.
Can Aegis validate invalid JSON?
Yes. Paste the input and the tool reports whether the browser parser accepts it. When parsing fails, the output stays unavailable until the input is corrected.
Does formatting change the data?
Pretty-printing changes whitespace. Optional key sorting changes object-key order, so use it only when that ordering change is acceptable for your workflow.
Is my JSON uploaded?
The formatter and validator run locally in the browser and do not need a server request to parse or format the input.