JSON Formatter & Validator

Beautify, validate, and minify JSON instantly. 100% browser-based. Your data never leaves your device.

Format & Beautify Validate Syntax Minify No Data Uploaded

Indent:

INPUT 0 chars

OUTPUT 0 chars

How It Works

Paste or Load JSON

Paste JSON text, use the Paste button, or load a .json file from your device.

Format or Minify

Click Format to beautify with proper indentation, or Minify to compress it.

Copy & Use

Copy the result to clipboard. If JSON is invalid, you'll see the exact error location.

Features

Pretty Print

Beautify minified JSON into readable, indented format. Choose 2 or 4 spaces.

Validate

Instantly detect syntax errors with precise error messages showing what went wrong.

Minify

Compress JSON by removing whitespace. See the percentage reduction instantly.

100% Private

Your JSON data stays in your browser. Nothing is sent to any server.

File Support

Load .json files directly from your computer. No size limit.

Instant

No loading time. Format megabytes of JSON data in milliseconds.

Why choose ToolKnit JSON Formatter?

Format & validate

Pretty-print with adjustable indentation, or minify for production. Instant error detection.

No data leaves your browser

Safe for API keys, tokens, and config files. Nothing is uploaded.

Copy with one click

Copy formatted or minified output to clipboard instantly.

Pro Tips

● Validate before debugging — paste your API response here to spot errors.
● Instantly find missing commas, unclosed brackets, or trailing commas.
● Minify for production — remove whitespace from config files to save bandwidth.
● A 50 KB formatted JSON might become 20 KB minified.
● Press Tab in the input area to insert spaces, just like a code editor.
● Safe for sensitive data — use this for API keys, tokens, and config files.
● Nothing leaves your browser — 100% client-side processing.