JSON Formatter & Validator
Format, beautify, minify and validate your JSON data. Get instant error detection and syntax highlighting.
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 the most common data format used in REST APIs, configuration files, and web applications.
Common JSON Use Cases
- API responses from web services (REST APIs)
- Configuration files (package.json, tsconfig.json)
- Data storage and exchange between applications
- NoSQL databases like MongoDB
JSON Value Types
- String: "hello world" (in double quotes)
- Number: 42, 3.14, -7
- Boolean: true, false
- Null: null
- Array: [1, 2, 3]
- Object: {"key": "value"}
Frequently Asked Questions
Formatting adds indentation and newlines for human readability. Minifying removes all whitespace to reduce file size for faster network transfer.
Click the 'Validate' tab and paste your JSON. The tool shows 'Valid JSON' with key/depth stats, or an error message with the exact syntax issue.
Yes. Processing happens locally in your browser so there is no file size limit. Very large files (10+ MB) may be slow depending on your device.
No. All processing runs in your browser. Your data is never sent to any server.