FREE JSON FORMATTER

Free JSON Formatter, Validator & Minifier

Check JSON syntax, make it readable, or remove whitespace in one place.

Your JSON input and result are never uploaded or stored.

  1. 1Enter JSON
  2. 2Validate or convert
  3. 3Use result

1 · Enter JSON

Enter your JSON

Your JSON input and result are never uploaded or stored.

Paste text or load a JSON or TXT file.

0 characters · 0 bytesJSON, TXT · up to 5 MB

2 · Validate or convert

Choose an action

Indentation

Integers beyond the JavaScript safe integer range may be rounded.

3 · Use result

JSON result

Run an action to see the result here.

LOCAL BROWSER DATA TOOL

Format JSON online free without uploading

Input, processing, copying, and download all stay in your browser.
1

Enter JSON

Paste JSON or load a local file.

2

Choose an action

Validate, pretty-print, or minify it.

3

Use the result

Copy the result or download a JSON file.

JSON PROCESSING

Keep the page responsive

The work runs in a separate browser thread.

No server upload

Your JSON never leaves the device.

Web Worker

Parsing and conversion run away from the main interface.

Standard JSON

Syntax follows the native JSON parser.

FREE JSON FORMATTER FAQ

JSON formatter FAQ

Learn about syntax, privacy, and limits.
1Is my JSON sent to a server?

No. Input and output are processed only in browser memory.

2Are comments and trailing commas allowed?

No. Standard JSON does not allow comments, single-quoted keys, or trailing commas.

3Do formatting and minifying change values?

They preserve object and array structure and change whitespace. Integers beyond JavaScript’s safe range may be rounded.

4What is the size limit?

Input is limited to 5 MB to reduce browser freezes on mobile devices.