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Toolify
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JSON Validator

Quickly confirm whether a block of JSON is syntactically valid. Paste your data and the validator either confirms it's well-formed or returns a precise, human-readable error describing what went wrong and where — ideal for debugging API payloads and config files.

Start typing or paste JSON to check it.

How to use the JSON Validator

  1. 1Paste your JSON. Add the JSON you want to check.
  2. 2Review the verdict. Get an instant valid/invalid result as you type.
  3. 3Fix any errors. Read the error message to locate and correct the problem.

Frequently asked questions

What makes JSON invalid?

Missing or extra commas, unquoted keys, single quotes, trailing commas, and unclosed brackets or braces are the most common issues.

Does this validate against a schema?

This tool checks JSON syntax, not JSON Schema. It confirms the data is well-formed and parseable.