About this tool
About JSON Validator
Check API responses, configuration files and data payloads before they reach production. This JSON validator highlights syntax problems in the browser and lets you copy a corrected, readable result without an account.
This tool is available for browser processing. The main operation runs on your device when supported by the browser and selected format.
When to use this JSON validator
Use it after editing a request body, debugging an API response, checking a package configuration file, or reviewing JSON copied from another system. Validation catches malformed commas, quotes, brackets and values before an application rejects the file.
How to use this tool
- Paste JSON or add a supported file.
- Run the validator and read the reported line or syntax issue.
- Correct the input, then validate it again until no error remains.
- Copy or download the checked JSON and test it in the destination application.
Validation and privacy
Validation checks syntax; it does not prove that an API schema, business rule or external value is correct. Keep the original input, and do not paste tokens, passwords or private production data. Supported validation runs locally in the browser.
Related data tools
Use the JSON Beautifier to make valid JSON easier to inspect, JSON to CSV when you need rows and columns, or Base64 Decoder when the JSON contains encoded text.