Data
JSON Formatter
Format, validate, and minify JSON data. Everything happens on this device.
Tip: press Ctrl/⌘ + Enter
Your input stays private
This tool runs entirely in your browser. DevCalc does not send or store the content you enter.
How to use JSON Formatter
- Paste JSON into the input editor.
- Select Format & validate or press Ctrl/⌘ + Enter.
- Review the indented output and copy it when valid.
Example and important notes
A compact API response becomes consistently indented, making nested objects and arrays easier to inspect.
- JSON requires double-quoted keys and strings.
- Comments and trailing commas are not valid standard JSON.
Frequently asked questions
Does formatting change my data?
It changes whitespace only after parsing the JSON. Values and structure remain the same.
Is my JSON uploaded?
No. Parsing and formatting happen in this browser.