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Check if your JSON is valid, see errors with the exact line number, and get the formatted version in one click.
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Why validate JSON?
JSON (JavaScript Object Notation) is the standard format for data exchange between web apps, APIs, and services. A missing comma, an unclosed quote, or an incorrect structure can cause hard-to-spot errors in your app.
Validating JSON helps you quickly identify syntax issues, with the exact line and position of the error. Auto-formatting also transforms compact JSON into a clear, indented structure that's easy to read and understand.
Our tool runs 100% in the browser — your code is never sent to any server. Validate API responses, config files, database data, or any JSON content, quickly and safely.