JSON Validator & Lint Online

Validate JSON syntax with detailed error messages including line numbers, error type, and fix suggestions.

How to Use

  1. 1

    Paste JSON

    Paste your JSON data into the editor.

  2. 2

    See results

    Valid JSON shows a green checkmark. Invalid JSON shows the error with location.

  3. 3

    Fix and re-validate

    Follow the error message to fix issues, then re-validate.

FAQ

What are the most common JSON errors?

Trailing commas after the last item, single quotes instead of double quotes, unquoted property keys, comments (not allowed in JSON), and missing closing brackets or braces.

What is the difference between JSON validation and formatting?

Validation only checks if JSON is syntactically correct (pass/fail). Formatting takes valid JSON and adds indentation for readability. Our JSON Formatter tool does both.