JSON Formatter & Validator

Pretty-print, validate, and minify JSON — with syntax coloring and instant error reporting.

  • Encoders & Formatters
  • Free
  • No sign-up

Free · No sign-up · Runs in your browser

Why use it

  • Format and minify

    Pretty-print with two-space indentation or compact JSON to a single line.

  • Instant validation

    Errors are reported inline with the line and message.

  • Your data stays put

    Parsing runs in your browser — API responses and secrets are never uploaded.

Great for

  • Reading API responses and webhooks while debugging
  • Validating config files before deploying
  • Minifying JSON payloads for requests or storage

How to use

  1. Paste raw or minified JSON into the input.
  2. Click Format to pretty-print, or Minify to compact it.
  3. Errors are shown inline with the line and message.
  4. Copy the result or clear the form.

Questions

Does my JSON leave the browser?
No. Everything runs in JavaScript in your browser — your data is never uploaded.
What indentation is used?
Two spaces by default, following common style guides. The minified form strips all whitespace.
Can it validate JSON5 or JSONC (with comments)?
No. This tool validates strict RFC 8259 JSON. Comments and trailing commas are not allowed in standard JSON.

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