Paste JSON to verify syntax before sending to an API or saving a config file. Results update as you type.
JSON input
Validation result
Enter JSON to validate.
Related tools
How it works
The tool runs JSON.parse on your input. Success means valid JSON; failure shows the parser message.
Only syntax is checked—schema, types, and business rules are not validated here.
What is validated
Standard JSON: objects, arrays, strings, numbers, booleans, and null with correct quoting and commas.
Privacy
Validation runs locally. Your JSON never leaves this page.
Common questions
- Trailing commas?
- Standard JSON does not allow trailing commas; they will fail validation.
- Single quotes?
- JSON requires double quotes for strings.
- Comments?
- JSON does not support comments; remove them or use JSONC elsewhere.
- Format after validating?
- Use the JSON formatter tool for pretty-printed output.