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JSON Validator

A powerful and free online tool to handle JSON Validator operations instantly in your browser. Fast, secure, and fully local by OrbitInfra.

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Validating JSON Syntax and Detecting Formatting Errors

A single missing comma, misplaced bracket, or accidental trailing comma can break an entire API integration or cause server deployment failures. Finding syntax mistakes in thousand-line JSON files manually is frustrating and prone to oversight.

Our online JSON Validator inspects your document against the official RFC 8259 JSON specification, highlights syntax mistakes down to the exact line and column, and provides clear explanations on how to fix them.

How to Use

  1. Paste your JSON data into the validation editor.
  2. The validator immediately parses the text in real time.
  3. If valid, a green confirmation badge with key counts and data type summary appears.
  4. If invalid, an error banner pinpoints the exact line number, column, and syntax issue.

Key Features & Capabilities

  • Pinpoints exact error line and column position with clear explanations.
  • Displays comprehensive statistics including object depth, array count, and key metrics.
  • Detects common pitfalls such as trailing commas, single quotes, and unquoted keys.
  • 100% private in-browser linting without server submission.

Common Developer Workflows

  • Validating API request and response bodies before sending them to production servers.
  • Linting manifest files like `app.json`, `package.json`, or OpenAPI JSON specs.
  • Troubleshooting webhook payload parsing failures.
  • Testing mock JSON datasets used in frontend unit testing.

Frequently Asked Questions

Are single quotes allowed in JSON?

No. The JSON standard strictly requires double quotes (") for both property names and string values. Single quotes (') will trigger a validation error.

Can JSON objects have trailing commas?

No. Unlike standard JavaScript object literals, standard JSON does not permit trailing commas after the final element of an array or property of an object.

Can I validate JSON files containing comments?

Standard RFC 8259 JSON does not permit comments (// or /* */). If your file contains comments, it is JSONC (JSON with Comments), which must be stripped before standard parsing.