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type JSON Schema Keyword

Use type to require a JSON value to be a string, number, integer, boolean, object, array, or null before other rules are evaluated.

Validation

Schema template

Try in Validator

JSON Schema

{
  "type": "string"
}

Valid example JSON

"ticket-123"

Invalid example JSON

123

Fields

FieldTypeRequiredDescription
typestring | string[]YesDeclares the allowed JSON data type. Use an array such as ["string", "null"] when a value may be nullable.

How to use this schema

Start most schemas with type. It gives validators a clear base rule and makes downstream errors for properties, items, format, and numeric constraints easier to understand.

Version support and combinations

This keyword or pattern is commonly supported across modern JSON Schema workflows. Check your validator for Draft-04, Draft-07, 2019-09, and 2020-12 behavior before relying on newer composition or conditional features.

Common combination: pair this reference with type, required, and properties so validation errors are specific enough for API clients and form users.

Batch validation seed

Want to validate JSON Schema in bulk? Toolumina Pro can grow into batch validation for 100+ files, saved schemas, and repeatable API contract checks.

Related reference pages

properties JSON Schema KeywordUse properties to define named fields and their schemas inside a JSON object.items JSON Schema KeywordUse items to define the schema that each element in an array must satisfy.format JSON Schema KeywordUse format to ask validators to check common string shapes such as email, uri, date-time, hostname, uuid, and ip-address.