JSON Formatter & Validator

Paste JSON to format it for reading, minify it for production, or validate syntax before using it in an API, app, or spreadsheet workflow.

Browser-based No signup required Private input

Input

Paste JSON

Output

Formatted JSON

Readable JSONIndent messy JSON so APIs, logs, and settings files are easier to inspect.
Minify for productionRemove extra whitespace when you need compact JSON for transport or storage.
Private by designYour JSON is processed locally in your browser and is not uploaded.

How to use this JSON formatter

  1. Paste JSON or upload a .json file.
  2. Choose Format, Minify, or Validate.
  3. Copy or download the result when the JSON is ready.

FAQ

Does it fix invalid JSON automatically?

No. It shows a syntax error so you can correct the original data safely.

Is my JSON uploaded?

No. The formatting and validation happen in your browser.

Can I format API responses?

Yes. Paste a JSON response from an API to make it easier to read.

How to format JSON

  1. 1
    Paste your JSONDrop raw or minified JSON into the input box.
  2. 2
    Format or validateBeautify it with clean indentation, or let the validator point out exactly where the syntax breaks.
  3. 3
    Copy the resultCopy the formatted or minified JSON with one click to use in your code.

Why use this JSON formatter

  • Beautify, minify, and validate in one place
  • Clear error messages that point to the problem
  • Runs in your browser — your data is never uploaded
  • Free, with no sign-up and nothing to install

Developer Tools

Format and validate JSON in your browser

Raw JSON from an API or a log is often a single unreadable line. This formatter indents and beautifies it so the structure is easy to scan, flags syntax errors so you can find the missing comma or bracket, and can minify it again when you need the smallest possible payload. It runs entirely in your browser, so the data you paste, including API responses and config, never leaves your device.

Best results

  • Format API responses before reading them
  • Validate before pasting JSON into config files
  • Minify when you need the smallest payload

Common fixes

  • Invalid JSON? Check for trailing commas and unquoted keys
  • Numbers look wrong? Very large integers can lose precision
  • Broken characters? Make sure the source is UTF-8

Private by design

Formatting and validation run entirely in your browser using client-side JavaScript. Your JSON is never uploaded, stored, or shared, so API responses and config data stay on your device.

Frequently asked questions

Is the JSON formatter free?

Yes. Formatting, minifying, and validating JSON is completely free with no sign-up required.

Is my data safe to paste?

Yes. Everything runs in your browser and nothing is sent to a server, so sensitive responses and config never leave your device.

Can it validate JSON, not just format it?

Yes. It checks the syntax and points out where the JSON is invalid so you can fix it quickly.

Can it minify JSON too?

Yes. You can beautify JSON for reading or minify it to the smallest size for transfer.

Why does my JSON fail to parse?

The most common causes are trailing commas, single quotes, unquoted keys, and missing brackets. The validator highlights the spot.