JSON Formatter & Validator
Format, validate, and beautify JSON instantly. Free online tool with syntax highlighting.
How to Use
- Paste your JSON into the input field on the left
- Click "Format JSON" to beautify and validate
- Use "Minify" to compress JSON by removing whitespace
- Copy the formatted output with one click
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that's 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.
JSON is built on two structures: a collection of key/value pairs (objects) and an ordered list of values (arrays). It supports strings, numbers, booleans, null, objects, and arrays as data types.
Frequently Asked Questions
Is my data safe?
Yes. This tool runs entirely in your browser. Your JSON data is never sent to any server.
What JSON errors can this detect?
The formatter detects syntax errors like missing brackets, invalid quotes, trailing commas, and malformed values.
Is there a size limit?
Since processing happens in your browser, the limit depends on your device's memory. Most JSON files up to several MB work fine.