You are on the right track, you may just have made a mistake in the reference. Try to console.log out the

response.body

first, then see what appears when you console.log out

response.body.messages

etc. until you get to the proper key. I cannot tell from the test code whether you are using intercept, but if you do there is a good chance you are confusing yourself with the naming. when you use intercept command and then use e.g.

cy.wait()

what you will get is an object that will contain both request and response. this means, that if you name your callback parameter

response

than you would end up with something like this:

js
cy.wait('@myThing')
  .then( response => {
  console.log(response) // will contain response and request
  console.log(response.request) // will contain request
  console.log(response.response) // will contain your response
})

I’d suggest using different alias in the

.then()

callback parameter, so something like

.then( myThing => {})

or even better, use destructuring:

js
cy.wait('@myThing')
  .then( ({response, request}) => {
  console.log(request) // will contain request
  console.log(response) // will contain your response
})

this way you don’t need to worry about naming things so much. I wrote an article on using destructuring and also on finding the right key in the response object, so that might give you some more useful info: https://filiphric.com/reading-and-testing-json-object-in-cypress https://filiphric.com/using-destructuring-in-cypress