JSON formatter

Paste JSON and get it pretty-printed with proper indentation, or minified to a single line. Syntax errors are caught immediately, so it doubles as a JSON validator.

Paste JSON and get it pretty-printed with proper indentation, or minified to a single line. Syntax errors are caught immediately, so it doubles as a JSON validator.

How to use

  1. Paste your JSON into the editor
  2. Choose Beautify for readable indentation or Minify for a compact one-liner
  3. Fix any reported syntax error and re-run
  4. Copy the result with one click

Frequently asked questions

Is my JSON uploaded to a server?

No. Formatting and validation run entirely in your browser — the data never leaves your machine.

What errors does the validator catch?

Anything that makes JSON invalid: missing commas or quotes, trailing commas, unclosed brackets, bad escapes.

Can it handle large files?

Yes, within your browser's memory — documents of several megabytes format without problems.

What is minified JSON for?

Minification strips whitespace to shrink payloads sent over the network or stored in databases.