JSON Validator

Check JSON syntax with our free JSON validator and JSON validator online tool. Quickly validate JSON, use the JSON checker, and identify formatting or syntax problems in your data. Our JSON validation, JSON syntax checker, and JSON syntax validator make it easy to determine whether JSON is valid. You can also use the tool as a JSON lint, JSON lint online, and check JSON utility before using data in an application or API. Easily validate JSON online and identify invalid structures. Wondering how do I validate JSON, how do I check if JSON is valid, or how can I fix invalid JSON? Paste your JSON and check it instantly.

How to use the JSON Validator

  1. Paste JSON.
  2. Read the verdict and top-level type.

JSON Validator features and limits

How the JSON Validator works

The text is passed to JSON.parse; success or the thrown message is shown.

Privacy and browser processing

Your input is processed locally in this page and is not uploaded or stored by Best Web Tools. Your hosting provider may still keep ordinary server logs for page requests.

Frequently asked questions

Are comments allowed?

No. JSON forbids comments and trailing commas.

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Why use the JSON Validator?

A single misplaced comma breaks an API call or config file. Validating first narrows the problem quickly.