I’m trying to test a fetch that responds with a readable stream for an image, but I’m stuck and not sure how to approach this specific case. Is there a simple, easy way to mock the call’s response? Any help would be appreciated 😀 The generator function looks like the following: Answer You can use testing the saga generator function
Tag: fetch
Return promise from Fetch when posting through Nodemailer
I want to run code in a .then() after a fetch() resolves, the issue is that my .then() does not run after the POST method resolves, it does however if it rejects. What I am doing is sending a mail through my server using Nodemailer. So I’m not entirely sure what the issue is but perhaps Nodemailer doesn’t return a
How do I use a fetch get response more than once?
I want to set both of these values in the state to be used later as variables. But it gives the error: How do I fix this? Answer Try this: The last two .then statements need to be combined. By calling .then twice, you’re sending the result of setDollarValue() (a void function) to the next .then, which is not what
Update DataTable when doing fetch call
This is the table i want to apply DataTable on : In my basic code, i have a dateRangePicker that displays the calendar, and based on the interval of dates chosen, there will be a fetch method to my server to fetch data from the database and display them in the table. The problem that i have is regarding the
Flaky errors when fetching & rendering data using React Hooks
I’m fetching data from an API & rendering the results. This is working for a while & then I’m getting the following error: itemList.js:23 Uncaught TypeError: items.map is not a function & also Consider adding an error boundary to your tree to customize error handling behavior. Any ideas on why is this happening? This is my code sample: Answer useEffect(callback,
Intercepting Fetch function – Request Headers
I am intercepting already intercepted fetch and I cannot read final request data (specifically request headers). By intercepting I mean wrapping original window.fetch() See comments below. Answer Okay, so once the window.Fetch is wrapped second time, then you cannot get the latest arguments before the actual request. It would be perfect to be able to make the first wrap, but
Yelp API Request returning as “undefined”
I am making an API call to the yelp-fusion. However, when I try to log this result, the log shows as undefined. I assume this is due to something regarding promises or async functions. Note: I need to keep this in a function as I intend to export this function to other files. Answer I think you are handling the
Abort a JS fetch() after request is sent and before the wait/download time
My problem: I am currently trying to send several fetch() requests to a url without having to wait for the server’s response. The exact use case is to build a small chrome extension that increase a counter on an external server (which I do not have control on) that increments on GET requests. But, for the sake of UX, I
How to pass data from a JSON file to a JavaScript class
I have a local JSON file with the following structure: and a class project, which I’m not sure should be like this: Now, I can work with the data after using fetch, but I do not know how to use it outside of the response. I want to fetch the JSON file and put it into a class I can
why does the fetch request not work when I try to fetch a markdown file?
I am trying to display a markdown file from my computer to the browser window with fetch, but the response (text) is undefined, why is this happening? I leave a codepen with my code. https://codepen.io/matiasConchaSoto/pen/popvQgp somebody help me please. Answer The first .then() has a missing return. Try: Even better, something like: