What does a JSON Validator do?

A JSON Validator checks whether the text you pasted is valid JSON. If it's valid, it confirms this; if not, it shows the type of error and, where possible, the exact line and column it occurred on.

What's the difference between JSON Validator and JSON Formatter?

JSON Validator only checks validity and reports where the error is. JSON Formatter turns valid JSON into readable pretty-printed text or minifies it — they're complementary tools that serve different purposes.

What are the most common JSON errors?

The most common errors include trailing commas (a comma after the last item), unquoted or single-quoted key names, and missing closing brackets or braces.

Is my data sent to a server?

No. Validation happens entirely in your browser using JavaScript; the JSON you enter is never sent to any server.

Tools/💻 Digital Tools/JSON Validator

JSON Validator

Check whether your JSON data is valid; if not, see exactly which line and column the error is on.

Version 1.0 · Last Updated: August 3, 2026 · Maintained by ToolLarder

JSON Input

Paste your JSON here…

Paste some JSON to check it.

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