Developer Tools

JSON Validator

Validate JSON syntax and structure instantly online.

Part of Yoopla's 445+ free browser tools.

How to Use JSON Validator

  1. 1

    Paste your JSON into the input box.

  2. 2

    Click "Validate" to check for syntax errors.

  3. 3

    Errors are highlighted with line and column information.

  4. 4

    Fix the errors and re-validate until it passes.

Frequently Asked Questions

What does JSON validation do?

It checks whether your JSON string conforms to the JSON specification (RFC 8259).

Can it validate JSON Schema?

Currently the tool validates JSON syntax. Schema validation is on the roadmap.

Why is my JSON invalid?

Common causes: trailing commas, single quotes, unescaped special chars, or missing braces.

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JSON Validator | Yoopla