JSON Formatter

Free Online JSON Formatter — Your Data Stays Private

Format, validate, and beautify JSON entirely in your browser — your data is never sent to a server. Paste messy or minified JSON and get a clean, indented output instantly. You can also minify JSON for production. Syntax errors are caught and shown with clear messages so you can fix issues quickly.

How to Format JSON

1. Paste your JSON data into the Input text area on the left.
2. Click Format to beautify the JSON with proper indentation, or click Minify to compress it into a single line.
3. Choose your preferred indent size — 2 spaces, 4 spaces, or tab.
4. If the JSON is invalid, an error message appears showing what went wrong.
5. Click Copy on the output to copy the formatted result to your clipboard.

Tips and Best Practices

• Use the Load Sample button to see an example of valid JSON if you are new to the format.
• Common JSON errors include missing commas between items, trailing commas after the last item, and unquoted keys. The error message will help you locate the problem.
• Use 2-space indentation for compact, readable output. Use 4 spaces if you prefer more visual separation between nesting levels.
• Minified JSON is useful for API requests, configuration files, and any situation where file size matters.
• This tool also works as a JSON validator — if your data parses successfully, it is valid JSON.

Who Needs a JSON Formatter?

Developers use JSON formatters daily when debugging API responses, reviewing configuration files, and inspecting data structures. Frontend and backend engineers format JSON from REST APIs and GraphQL responses to understand the data shape. QA testers validate JSON payloads during testing. Database administrators review JSON documents stored in NoSQL databases. Anyone who works with APIs, web services, or modern data formats will find this tool valuable.

Why Use Our JSON Formatter?

• Completely free with no signup and no limits.
• Instant formatting and validation with clear error messages for invalid JSON.
• Both format and minify modes in one tool.
• Customizable indentation: 2 spaces, 4 spaces, or tabs.
• Everything runs in your browser — your data never leaves your device.
• One-click copy to clipboard for the formatted output.