JSON Validator

What is JSON Validator?

A JSON validator checks whether a string of text conforms to the JSON specification (RFC 8259). It identifies syntax errors such as missing commas, unmatched brackets, invalid escape sequences, trailing commas, and single quotes (which are not valid in JSON). Beyond syntax checking, this validator also reports structural information: the root data type (object, array, string, number, boolean, null), the number of top-level keys, array lengths, and the overall data size in bytes. Validation is essential before processing JSON data in applications, submitting API payloads, or storing configuration files to prevent runtime errors and data corruption.

How to Use JSON Validator

1. Paste your JSON into the input field.
2. Click Validate JSON.
3. See whether the JSON is valid or invalid.
4. Review the type, size, and key information.

Examples

{"valid": true, "items": [1, 2, 3]}

{"invalid": true,}  // trailing comma

Common Use Cases

• Checking API payloads before sending requests
• Validating configuration files for deployment pipelines
• Debugging JSON parsing errors in applications
• Verifying data exports from databases and services

Related Variations