JSON Validator
Validate JSON syntax instantly and detect formatting errors. Beautify and minify JSON data. Check against JSON Schema. 100% free and private - all validation happens in your browser.
Input JSON
Syntax Validation
Validate JSON syntax with detailed error messages pointing to exact issues
Auto-Format
Automatically format JSON with proper indentation and syntax highlighting
Schema Validation
Validate JSON against JSON Schema to ensure data structure compliance
Frequently Asked Questions
What's a common JSON error?
Most common: single quotes instead of double quotes, trailing commas, missing commas, and unquoted keys. Our validator points to the exact line.
What causes JSON parsing errors?
Invalid syntax: wrong quotes, trailing commas, unquoted keys. Encoding issues: wrong character encoding. Our tool identifies the exact problem and line number.
How do I fix "unexpected token" errors?
Check the line number indicated. Common fixes: remove trailing commas, use double quotes, add missing commas, fix quote mismatches. Our validator highlights the issue.
Can I validate API responses?
Perfect for that! Paste API response JSON to validate the structure. Useful for debugging API integrations and checking response formats.
What is JSON Schema validation?
JSON Schema defines the structure your JSON should follow. We validate both that JSON is valid AND that it matches your schema structure.
Can I format large JSON files?
Yes! Handle files up to 10MB. Large JSON files are processed and validated efficiently. Download formatted results as a file.