JSON Validator

Check JSON syntax, catch parsing errors, and preview valid JSON instantly. Everything runs locally in your browser.

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JSON Validator

Validate JSON syntax, pretty-print, and inspect structure depth and key count — all locally in the browser.

JSON Input
Formatted Output
Valid formatted JSON will appear here.
Paste JSON to validate, or load the sample.
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What is a JSON Validator?

A JSON Validator checks whether a JSON document follows the strict JSON syntax rules required by APIs, configuration files, and data pipelines. It helps you catch missing commas, unclosed brackets, invalid quotes, trailing commas, and other syntax issues before the JSON is used in an application.

How to Use JSON Validator

  1. Paste your JSON into the input panel.
  2. The validator checks the syntax instantly as you type.
  3. If the JSON is valid, review the formatted preview.
  4. If an error appears, use the message to fix the invalid part.
  5. Copy the validated JSON when you are done.

Frequently Asked Questions

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