JSON Schema Validator
Validate JSON data against common schema rules including types, required fields, properties, arrays, enums, ranges, and patterns.
Validation Result
Supported Rules and Privacy
Validation runs locally in your browser. This tool supports common rules such as type, required, properties, additionalProperties, items, enum, const, numeric and length limits, pattern, uniqueItems, allOf, anyOf, oneOf, and not. It does not implement every JSON Schema draft keyword, format checker, or external $ref.
Checking JSON Structure Against Common Schema Rules
Valid JSON syntax only confirms that a parser can read the text. It does not confirm that required fields exist, values use the expected types, arrays contain valid items, or application rules are met.
This validator checks JSON data against a practical subset of JSON Schema rules directly in the browser. It is useful for API payloads, webhook examples, configuration data, fixtures, and integration debugging.
How to Use the JSON Schema Validator
- Paste the JSON data into the first editor.
- Paste a JSON Schema object into the second editor.
- Click Validate JSON.
- Review each reported path and rule before changing the data or schema.
Supported Validation Areas
- Primitive, object, array, and integer type checks.
- Required properties and nested property validation.
- Array item rules, length limits, and unique items.
- Enums, const values, numeric ranges, and string patterns.
- Common allOf, anyOf, oneOf, and not combinations.
Example JSON Schema
{
"type": "object",
"required": ["name", "email"],
"properties": {
"name": {
"type": "string",
"minLength": 2
},
"email": {
"type": "string"
}
},
"additionalProperties": false
}Frequently Asked Questions
Is valid JSON automatically valid against a schema?
No. JSON syntax can be valid while fields, types, required values, or nested structures do not match the schema.
Does this implement every JSON Schema keyword?
No. It supports the common rules listed above but does not provide complete draft compliance, format validation, or external reference resolution.
Can I use this for API payload checks?
Yes, for quick development checks. Production validation should use a standards-compliant library configured for the JSON Schema draft used by your application.
Is my JSON uploaded?
No. The JSON data and schema are processed locally in the browser.