Online
JSON Formatter
Format and validate JSON in your browser. Paste raw JSON on the left, then Prettify it with your chosen indentation or Compress it to a single line — the result appears on the right. Nothing is sent to a server.
Console
json-formatter
Input
Output · Lines 0
Formatted JSON appears here…
Operation
- 01 Paste or type your JSON into the input box on the left.
- 02 Pick an indentation (2 spaces, 4 spaces, or tab) and press Prettify — or press Compress to minify.
- 03 Read the line count, then copy the formatted JSON from the right.
Reference
- Is my JSON sent to a server?
- No. Formatting and validation run entirely in your browser — your data never leaves your device.
- What does Compress do?
- It re-serializes your JSON with no spaces or line breaks, producing the smallest single-line form — useful for embedding or transport.
- What happens if my JSON is invalid?
- The formatter shows the parser error message so you can locate the problem; the last valid output stays visible.
- Which indentation options are supported?
- Two spaces, four spaces, or a tab character — pick the one your project or style guide uses.