Not sure I fully understand the question, but you can use

cy.intercept

followed with

.then(resp)

to gather the response values from the

resp

resp is usually a JSON object so this is the next step https://stackoverflow.com/questions/9907419/how-to-get-a-key-in-a-javascript-object-by-its-value

You can use an

expect(resp.body).to.have.property('key', 'value');