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 and if it's not 200 (ok) throw an error

 fetch("some-url")
    .then(function(response)
     {
      if(response.status!==200)
       {
          throw new Error(response.status)
       }
     })
    .catch(function(error)
    {
      ///if status code 401...
    });