Validating JS Tests against a JSON Schema

I have an API which returns response in the format

[
{"id": 12345,
"value": "some_string",
"practice_id": "12344"},

{"id": 12346,
"value": "some_other_string",
"practice_id": "12345"},
]

I am testing that the response validates a specific JSON-Schema, and my schema test is

response.body.should.have.schema({
        type: 'array',
        required: ['id', 'value', 'practice_id'],
        properties: {
            id: {
                type: 'number',
            },
            value: {
                type: 'string',
            },
            practice_id: {
                type: 'string',
                minLength: 5,
            }            
        }
    });

The issue is that the test passes even if I change the type of id to string or change the value of practice_id to number, which is not correct.

What am I doing wrong here? I am using Postman-BDD to validate the responses.