JSON validator

Validate JSON syntax and locate errors by line and column. Does not validate JSON Schema and allows duplicate keys. Up to 1 million characters and 100 levels.

Your inputs stay herePUFFINMINT

Set your data

Set your data

Result

Enter your data and run the tool. Your result will appear here.

The values you enter stay on this page. Reloading or closing it clears them.

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How to use the tool

  1. Fill in these fields: Source text.
  2. Select “Validate” to obtain the result.

Method and principles

JSON · RFC 8259

Result details

Result details
ParameterValue
Input characters43

Practical example

Input
  • Source text: {"tool":"Puffinmint","id":9007199254740993}
Result
JSON ✓

Limits and checks

Limits and checks
ParameterValue
Source text≤ 1000000 characters

Sources and further reading

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