contains JSON Schema Keyword JSON Schema

Array

Schema template

JSON Schema

{
  "type": "array",
  "contains": {
    "type": "number",
    "minimum": 10
  }
}

Valid example JSON

[
  2,
  12,
  4
]

Invalid example JSON

[
  1,
  2,
  3
]

Fields

Field	Type	Required	Description
`contains`	schema	Yes	The array is valid when one or more elements match this schema. Later drafts can combine it with minContains and maxContains.

How to use this schema

contains is useful for feature lists, mixed event arrays, and validation where one required marker or qualifying value must appear somewhere in an array.

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.

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contains JSON Schema Keyword