Originally posted at Medium.
TL;DR
async/await allows us to program using asynchronous requests in a "synchronous" manner using the mo...
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I find more readable :
Fetch returns a promise, no need to wrap this in an async function.
Not working...
SyntaxError: await is only valid in async functions and async generators
Yo dog I heard you like await, so I put an await inside your await:
const data = await (await fetch('https://api.com/values/1')).json();It would be nice if fetch offered a one-step method to get straight to the JSON data.
How do you get the nice sublime font colors?
LOL
You could create a function for that.
I just create a javascript code block in markdown for the colors. :)
your request function doesn't return the json result, only logs it. The function still returns a promise in my code, is it normal behavior? should the request function be sync when called as
const res = request()?
ahh the function wrapping that should also be async, so it should be like:
given that you return the
jsoninstead of just logging it in therequest()function.Exactly what I needed to know too - thanks!
I have the following problem, I have an express API endpoint which returns a token, although the promise .then() returns SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data like the Promise is still not resolved. Anyone else have such issues? I tried your code as well but with the same result.
Hey! When I get this error, it's usually because the result I get isn't in JSON. Try
await response.text()and check the response.Guys, i would like to solve one issue with this async function. How to load output from that function to a variable usable in later non-async code? Like lets say i collect data from couple of APIs within async function, then i need to do some logic on top of that data with non-async code.
You can pass an objetc to the function, and then take care to only change the content of the object without making a copy of it, then what is passed is the address of the object. And when you modify it with methods of the object that don't make copies, you will be modifying the object itself outside the scope of the function.
I imagine that you already solved this but since I haven't seen anybody ever give you an answer I am posting this to help others with the same problem.
I've mostly stayed on the sidelines in terms of the new JavaScript features, but I'm starting to get back into it, and async await is something I look forward to playing with.
This is a great article, very new to this area and this is something that's been bugging me for days. I knew there had to be a better way to do what i wanted and this is it.
Plenty of examples out there going off on tangents or using jQuery etc - and also pointed me in the direction of something to read up on further.
Hi
May be I am a bit naive. But this bit of code not working for me. I am trying to put this in a react component in componentDidMount to get data from asp.net controller and getting various errors. Any pre-requisites for this code to work.
if fetch end in catch this Will Block the app.
Yes, indeed. You can prevent it by wrapping those lines in a try / catch block
(async () => {
const todo = await Model.create(
{
//data
}
);
const todoItem = await todo.save();
great!!!!!!! thanks for all