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The contains property provides additional validation rules for an array of items.

The contains property holds a schema. In order for the instance JSON document to be valid, at least one item in the array must comply with this schema. 

Example

"AnArrayOfStrings": {
    "type": "array",
    "items": {
        "type": "string"
    },
    "contains": {
        "type": "string",
        "const": "My Required Value"
    }
},

 The schema above specifies a property 'AnArrayOfStrings', and at least one item in the array must be a string "My Required Value".

"AnArrayOfStrings" : [ "a", "b", "My Required Value", "x" ]