Tool
JSON Validator
Validate JSON syntax and catch parse errors instantly.
Developer Tools
What this tool does
Paste JSON to validate syntax before sending to APIs, saving configs, or converting to other formats.
How to use
- Paste JSON text.
- Click Validate.
- Fix any reported syntax errors and re-validate.
Examples
Valid object
Input: {"name":"Ada","active":true}
Output: Valid JSON ✓
Parses without errors.
Invalid trailing comma
Input: {"name":"Ada",}
Output: Invalid JSON error
Trailing commas are not allowed in standard JSON.
Common use cases
- Debug API response syntax
- Validate config files before deploy
- Check JSON before CSV conversion
FAQ
Does this format JSON?
Use the JSON Formatter to pretty-print or minify valid JSON.
Can I validate large JSON files?
Large payloads depend on browser memory. Very large files may be slow.
Is my JSON uploaded?
No. Validation runs locally in your browser.
Explore related workflows
JSON workflow
- JSON Formatter and ValidatorValidate, pretty-print, and minify JSON with clear parse error messages.
- JSON to CSV Converter ProConvert JSON or NDJSON arrays into CSV with file drop, column reorder, flatten, and Excel BOM.
- JSON to YAML ConverterConvert JSON objects into readable YAML configuration files.
More related tools
Last reviewed: 2026-05-23