How to catch 401 error using fetch method of javascript

Question

I need to catch error 401 Code of response so that I can retry after getting a new token from token endpoint. I am using fetch method get data from API.

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Answer 1

You can check the status of the response in then:

fetch(request)
  .then(function(response) {
    if (response.status === 401) {
      // do what you need to do here
    }
  })
  .catch(function(error) {});