JSON Validator
Paste JSON to instantly check whether it is valid, catching syntax errors before they cause problems elsewhere.
About this json validator
A single missing comma or unclosed bracket can break an entire API call or config file. This tool checks validity instantly so you can fix the problem before it causes a bigger headache downstream.
How json validator works
Your JSON is parsed using the browser's native JSON parser, if it parses successfully, it is valid, if not, the parser's error message is shown to help you locate the problem.
Common uses
- Catching a syntax error before deploying a config file
- Verifying an API response or request body is well-formed
- Debugging why a JSON parser is failing elsewhere
How to use this tool
- Paste your JSON.
- Click Process.
- See whether it is valid, or where the error is.
What to know before using it
Confirms syntactic validity only, it does not check your JSON against a specific schema or expected structure.
Privacy and browser-first processing
Your JSON is processed entirely in your browser and is never uploaded or stored.
Frequently asked questions
What is the most common JSON error?
Trailing commas and mismatched quotes are among the most common, JSON (unlike JavaScript objects) does not allow a trailing comma after the last item.