JSON Formatter & Validator
Beautify, validate, minify, copy, and download JSON directly in your browser.
Input JSON
Output
How it works
This tool validates JSON using the browser's native parsing support and formats it using built-in JSON serialization methods, which makes it fast and fully client-side for normal formatting and minifying workflows. Your JSON can be prettified with indentation or compacted into a minified form without sending it to a server.
- Use Format JSON to beautify valid JSON with 2 or 4 spaces.
- Use Minify JSON to remove extra whitespace and compact the payload.
- Use Validate JSON to check whether the input is valid JSON and show parse errors.
- All processing happens locally in your browser - no data is sent to any server.
Frequently Asked Questions
JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write and easy for machines to parse and generate. It's commonly used for transmitting data between a server and web application, as well as for configuration files and data storage.
Formatting (or beautifying) JSON adds indentation, line breaks, and spacing to make it human-readable. Minifying removes all unnecessary whitespace, line breaks, and indentation to reduce file size for faster data transmission.
The validator uses JavaScript's built-in JSON.parse() method to check if your input is valid JSON. If the parsing succeeds, the JSON is valid. If it fails, the validator shows the specific syntax error and line number where the issue occurred.
Yes, all processing happens locally in your browser. Your JSON data is never sent to any server, making it completely secure and private. This is especially important when working with sensitive or proprietary data.
Since all processing is done in your browser, the limit depends on your browser's memory and the JavaScript engine's capacity. Most modern browsers can handle JSON files up to several megabytes without issues.
Yes, you can paste any JSON response from APIs directly into the input field and use the Format JSON button to beautify it. This makes it easier to read and debug API responses.