JSON Formatter

Format and validate JSON locally in your browser. Pretty print, minify, and copy. No upload.

Tip: Explanations come first. The tool is below. Ads are placed last.

Overview

Format, validate, and minify JSON safely in your browser. JSON is easy for machines but hard for humans when it’s unformatted. This tool helps you pretty‑print JSON with indentation, validate syntax, and compress it when needed.
Paste JSON, choose Format or Minify, and copy the result. Processing happens locally for privacy.

How to use

Read the notes above so you know what the tool will do.
Enter your input and click the main action button.
Copy or download the result when you’re done.

Privacy

This page is designed for fast, local processing in your browser. We don’t ask you to create an account, and we avoid uploading inputs to our server whenever possible.

Sort keys Indent with tabs Pretty uses 2 spaces by default.

1) Input

Paste JSON. We never upload it.

2) Output

Formatted result or error message.

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Ready.

FAQ

Does this tool upload my data?
Most tools run locally in your browser. If a tool ever needs a network request (for example, to load a library), it will be mentioned on the page.

Why does the output look different from another site?
Different tools can use different defaults (timezones, whitespace rules, encoding behavior). Check the options and try a small sample first.