JSON Validator

Runs entirely in your browser

Check your JSON for syntax errors directly in your browser. Get an exact error location, or a structural summary when it's valid.

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— Status
— Root type
— Keys / items
— Depth
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How to use JSON Validator

  1. Paste your JSON into the Input box.
  2. Click Validate.
  3. Fix the reported error, or review the structure summary and pretty preview for valid JSON.

Features

  • Clear valid/invalid status with exact error location.
  • Root type, key/item count and nesting depth for valid JSON.
  • Pretty-printed preview of valid JSON.
  • 100% client-side — your data never leaves your browser.

Frequently Asked Questions

Is my JSON uploaded to a server?

No. JSON Validator checks your JSON directly in your browser. Your data never leaves your device.

How do I find the exact error in my JSON?

When your JSON is invalid, the error message includes the line and column where the problem was found, when your browser provides that information.

What information do I get for valid JSON?

You'll see the root data type, the number of keys or items, the nesting depth, and a pretty-printed preview of your JSON.

Does this tool format my JSON too?

Valid JSON is shown pretty-printed in the Output box so you can review its structure, but for dedicated Beautify and Minify controls, use the JSON Formatter tool.

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