What this json validator does
Paste JSON and validate it instantly. Valid payloads show basic structure information; invalid payloads show the browser parser error to help you locate the problem.
Input
JSON text that you want to check.
Output
A validation result plus structural details for valid JSON or an error message for invalid JSON.
Example
Use the validator before sending a configuration file to an API to catch a missing quote, extra comma or malformed value.
Privacy
Processed locally in your browser — your working input is not uploaded by this tool. The current implementation uses browser APIs for processing. If Tools Brave later adds a server-powered version of this utility, the page will disclose that change before processing begins.
Limitations to know
- This checks JSON syntax, not whether the data matches a specific JSON Schema.
- Parser error wording can differ slightly between browsers.
- Semantic business rules are outside the scope of syntax validation.
Frequently asked questions
Common causes include trailing commas, unquoted property names, unmatched braces, invalid escape sequences and comments.
No. This version validates standard JSON syntax and reports basic structure information.
Use JSON Formatter after correcting the syntax; a dedicated repair workflow can be added later.