Free Online JSON Validator

Paste JSON below and click "Check & Suggest Fix" in the toolbar to validate it.

Input Ready

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Output

Output statistics are available via the Stats button above this field.

Results are provided for informational purposes only and may contain errors. Please verify important information independently. Use of this tool is at your own risk.

What the JSON Validator does

The JSON Validator checks whether your text is valid JSON according to the standard (RFC 8259). If it is not, it tells you what is wrong and where: the line and column of the first error, plus a suggested fix.

Validation is strict. JSON is a narrower format than JavaScript, so things a JavaScript engine accepts in code, such as comments, single-quoted strings, unquoted keys and trailing commas, are reported as errors.

When to use it

  • An API or library returns a parse error and you need to find the exact spot.
  • Checking a hand-edited config file (package.json, tsconfig.json, app settings) before deploying it.
  • Confirming that data exported from another tool is really JSON before converting it with the JSON to CSV Converter or the JSON to YAML Converter.

Worked example

Input

{
  "name": "Ana",
  "age": 30,
}

Output

Expected double-quoted property name in JSON at position 32 (Line 4, Column 1)

Suggestion: Check for missing/extra commas, unquoted keys, single quotes instead of double quotes, or a trailing comma before } or ].

Common questions about the JSON Validator

Why is a trailing comma an error?

The JSON standard does not allow a comma after the last item of an object or array. Many editors and JavaScript itself accept it, which is why it is the most common validation error.

Does it support JSON5 or comments?

No. It validates standard JSON only. Remove // and /* */ comments and use double quotes for all keys and strings.

Is valid JSON the same as correct data?

No. The validator checks syntax, not meaning. A value can be valid JSON and still have a wrong type or a missing field for your application.

Frequently Asked Questions

Does it tell me exactly where the error is?

Yes - errors are reported with line and column numbers whenever the underlying parser provides a position, so you don’t have to scan the whole document manually.

Does it check my data against a schema?

No - this validates JSON syntax (that it parses correctly), not structural rules like required fields or types. For that you’d need a JSON Schema validator.

Is this tool free?

Yes, it's free to use. No signup, no email required. Get results on this page.

How do I get my result?

Use the tool on this page. Your result appears here; no email delivery is required.