Validate JSON
Check whether a JSON is valid and locate the exact error (line and column) when it isn't.
Processed on your device. Nothing is sent to any server.
Check whether a text is valid JSON and locate the exact error (line and column) when it isn't, as you type.
Uses the browser's native JSON parser and translates its error message into a readable location (line and column) instead of showing only a technical message.
Use cases
- Quickly checking whether an API response is valid JSON.
- Debugging a JSON that fails to parse in your code.
- Verifying a JSON before pasting it into a configuration file.
How it works
- 1
Paste your JSON
The validation result appears automatically as you type.
Frequently asked questions
- Does it catch trailing commas?
- Yes, standard JSON doesn't allow trailing commas and this tool flags them as an error, just like JSON.parse would in any browser.