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JSON Formatter & Validator

Paste JSON to instantly format, validate, and minify it. Supports pretty-print with custom indentation, error highlighting, and copy/download.

JSON Input Paste JSON below

Formatted Output 0 chars

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What is a JSON Formatter?

JSON (JavaScript Object Notation) is the universal data interchange format used by APIs, config files, and databases. Raw API JSON is often minified (one line) for efficiency. A formatter adds indentation and line breaks so humans can inspect the structure easily.

Features

Format / Prettify: Adds indentation — 2 spaces, 4 spaces, or tabs.
Minify: Strips all whitespace for compact transmission.
Validate: Checks syntax and shows the exact error location.
Download: Save the output as a .json file.

Frequently Asked Questions

Is my JSON data sent to a server?

No. All JSON processing happens entirely in your browser using JavaScript. Your data never leaves your device, making it safe to use with API keys, tokens, or confidential data.

What does "invalid JSON" mean?

JSON has strict syntax rules — keys must be in double quotes, trailing commas are not allowed, and special characters must be escaped. The Validate button shows the exact error location.

What is minified JSON?

Minified JSON removes all unnecessary whitespace, reducing file size for network transmission. Our minify button converts prettified JSON into a single compact line.

Can I format JSON with tabs instead of spaces?

Yes! Select "Tab" from the Indent selector before clicking Format. All three options (2 spaces, 4 spaces, tab) produce syntactically valid, equivalent JSON.