How do I format JSON?

Paste your JSON into the input area and click Format. The output shows your JSON with proper indentation. Use the indent selector to choose 2 spaces, 4 spaces, or tabs.

How do I validate JSON?

Click Validate. If the JSON is valid, you see a success message. If it is invalid, the exact error message and line number are displayed.

How do I minify JSON?

Click Minify to remove all whitespace and produce the most compact valid JSON string. This reduces file size for network transfers.

Is my JSON data sent to a server?

No — all processing happens entirely in your browser using the native JSON.parse and JSON.stringify APIs. Your data never leaves your device.

JSON Formatter & Validator

Format, validate, and minify JSON with instant error detection. Your data never leaves your browser.

Your files never leave your device

Indent:

Input

Output

Output appears here…

How to JSON Formatter & Validator

Paste your JSON into the input area on the left.
Click Format to beautify with your chosen indentation (2 spaces, 4 spaces, or tab).
Click Validate to check if the JSON is valid — errors show with a line number.
Click Minify to produce a compact JSON string with no whitespace.
Use Copy or Download to save the output.

Why Use This Tool?

Raw JSON is hard to read. This formatter adds proper indentation so you can instantly understand the structure. The validator catches syntax errors and tells you exactly which line is wrong, saving debugging time. Minify removes all unnecessary whitespace to reduce file size for APIs and storage.

JSON Formatter & Validator

How to JSON Formatter & Validator

Why Use This Tool?

Frequently Asked Questions