How to .catch a Promise.reject

Question

I have a helper function for using fetch with CouchDB which ends as:

... return fetch(...)   .then(resp => resp.ok ? resp.json() : Promise.reject(resp))   .then(json => json.error ? Promise.reject(json) : json) 

and when I use it elsewhere, I was under the impression that I could .catch those explicit rejections:

  above_function(its_options)     .then(do_something)     .catch(err => do_something_with_the_json_error_rejection_or_resp_not_ok_rejection_or_the_above(err)) 

but alas, I can't seem to be able to get a hold of the rejections. The specific error I'm after is a HTTP 401 response.

What gives?

(Please note that there are implicit ES6 return's in the .thens)

Answer 1

    function test() {       return new Promise((resolve, reject) => {         return reject('rejected')       })     }      test().then(function() {       //here when you resolve     })     .catch(function(rej) {       //here when you reject the promise       console.log(rej);     });