Developer Tools

JSON Validator – Free Online Tool

Validate JSON syntax against RFC 8259 standards with line and column error indicators.

How to Use JSON Validator

  1. Paste the JSON snippet you want to check.
  2. Click "Validate JSON".
  3. View instant status: Valid JSON badge or exact error line and column.
  4. Fix errors with guided suggestions.

Key Highlights & Features

  • ✓ Line and column pinpointing
  • ✓ Strict RFC 8259 compliance
  • ✓ Auto-fix common errors

Frequently Asked Questions

Does it highlight trailing comma errors?

Yes, it immediately detects invalid trailing commas which violate the strict JSON standard.

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