JSON Validator
A JSON validator checks whether text can be parsed as standard JSON and surfaces syntax errors that prevent a parser from accepting it.
Quick answer
Validate JSON syntax online and identify parser errors in malformed JSON. The core operation is designed for quick browser-based use without an account.
How to use this tool
- Paste json
- Run validation
- And use the parser message and location to find the problem.
Common errors and things to check
Common failures include trailing commas, unquoted property names, mismatched brackets, and invalid string escaping.
Common use cases
- Checking API responses
- Validating configuration files
- Finding syntax errors before deployment
Privacy and local processing
Core processing for this tool is designed to happen in your browser. The page does not intentionally upload ordinary tool input to a DataToolBase server. Do not paste passwords, private keys, access tokens, personal data, or other sensitive secrets unless you have verified the security requirements for your use case.
Frequently asked questions
Does valid JSON have to be an object?
No. JSON can also be an array, string, number, boolean, or null.
Does validation upload my JSON?
The core validator runs in the browser.