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JSON Validator

Free

Paste any JSON string to validate its syntax. Get precise error messages showing the exact line and column where the problem is. Useful for debugging API responses, config files, and data payloads.

How to Use JSON Validator

  1. 1

    Paste or type your JSON string into the input field. Validation begins automatically as you type.

  2. 2

    Check the status badge — a green badge means your JSON is valid; a red badge means errors were detected.

  3. 3

    If errors are found, the exact line number and column position are shown, pointing you directly to the problem.

  4. 4

    Fix the reported error in the input field. The status badge updates instantly as soon as the JSON becomes valid.

Features

  • ✓ Real-time validation as you type
  • ✓ Precise error location (line + column)
  • ✓ Valid/invalid badge
  • ✓ Runs in browser

Frequently Asked Questions

What kind of errors does it detect?

All standard JSON syntax errors: missing quotes, trailing commas, unexpected tokens, mismatched brackets, and more.