freeCodeCamp/guide/english/javascript/standard-objects/promise/promise-reject/index.md

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Promise Reject

Promise Reject

A Promise.reject function returns an error condition to the calling function. It takes a single parameter, an Error object or value, as the reason for rejection.

Chaining a catch function at the end of a Promise caller will allow you to catch the error condition.

promiseCallingFunction(paramList)
  .then( ... )
  ...
  .then( ... )
  .catch( function(err) { // catch function
    /*
     * this is where you can access the reason for the rejection
     */ 
  });