Free JSON Validator & Formatter
Validate and format JSON data online. Check JSON syntax, beautify, and minify JSON instantly.
Try These WebTooly JSON Examples
Click any example to validate and format it instantly with our free AI-powered JSON validator tool.
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About JSON Validator
Our free JSON Validator helps you check if your JSON data is valid and properly formatted. Instantly validate JSON syntax, format it for readability, or minify it for production use. Essential for developers working with APIs and data.
How to Use JSON Validator
- 1Paste your JSON data into the input area.
- 2Click "Validate & Format" to check syntax and beautify the JSON.
- 3Or click "Minify" to compress the JSON into a single line.
- 4Copy the result or fix any errors shown.
Key Features
- Instant JSON syntax validation
- Automatic JSON formatting/beautification
- JSON minification option
- Clear error messages with line numbers
- Syntax highlighting
- Copy formatted output easily
Benefits
- •Quickly identify JSON syntax errors before they cause issues
- •Format JSON for better readability during development
- •Minify JSON to reduce payload size for APIs
- •Debug API responses and configuration files easily
Frequently Asked Questions
What is valid JSON?
Valid JSON must follow strict syntax rules: strings must use double quotes, no trailing commas, no comments, and proper nesting of objects and arrays.
Why is my JSON invalid?
Common issues include: single quotes instead of double quotes, trailing commas, missing commas between elements, unquoted keys, or JavaScript-style comments.
Can I validate large JSON files?
Yes, our validator works with JSON of any size. However, very large files may take a moment to process in your browser.