Loosely detecting JSON responses

test.js

// console.log(pm.response.headers.has('application/json')); doesn't work, too strict.

const isJsonResponse = (pm.response.headers.filter((header) => header.value.indexOf('application/json') !== -1).length > 0);

if (isJsonResponse) {
    pm.test("it should match schema", () => {
       const schema = {
            "$schema": "http://json-schema.org/draft-06/schema#",
            "$ref": "#/definitions/Welcome",
            "definitions": {
                // ... schema generated at https://app.quicktype.io
            }
        }
 
        pm.expect(tv4.validate(pm.response.json(), schema)).to.be.true;
    });
}

const isJsonResponse = pm.response.headers.filter(header => header.value.indexOf('application/json') > -1).length;

or even

const isJsonResponse = pm.response.headers.filter(({value}) => value.indexOf('application/json') > -1).length;

ohh the deconstructing the object... nice...