Fetch data from an API in regular interval in NodeJS

Question

I want to fetch data from an API in regular interval. I wrote a script which is fetching data successfully but how to repeat this step for infinite time, so that I can fetch data in regular interval.

I want to fetch data in the interval of 1sec, what should I do?

const fetch = require('node-fetch') const time = new Date() function saveData(metrics) { console.log(time.getSeconds()) console.log(metrics) console.log(time.getSeconds()) } const getData = () => { fetch('http://example.com/api/v1') .then(response => response.json()) .then(saveData) .catch(err => console.error(err)) } getData()

Does this answer your question? Run JavaScript function at regular time interval — Jorge Fuentes González
– Jorge Fuentes González, Commented Jan 25, 2021 at 10:10
Just a side note: maybe I misunderstood your aim but it looks to me that it does not make a lot of sens to declare const time = new Date() outside the saveData() function, if it has to be executed at regular intervals. — secan
– secan, Commented Jan 25, 2021 at 10:16

mss · Accepted Answer · 2021-01-25 10:27:15Z

3

Just use it like this

const interval = setInterval(() => { getData(); }, 1000);

If you want to avoid making wrapper callback like above, you can just pass getData as a callback, which setInterval will call after each specified interval time i.e 1 second here

const interval = setInterval(getData, 1000);

edited Jan 25, 2021 at 10:27

answered Jan 25, 2021 at 10:10

mss

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4 Comments

Andre Buschermöhle Over a year ago

Seems to be a nice solution for this problem. A shorter solution might be const interval = setInterval(getData, 1000) but I don't think you get any benefit from using the shorter version of this code. I just wanted to mention that.

mss Over a year ago

@Nope, you are right, we can just pass the getData as a callback to the setInterval, which it will call after each specified interval. I have just wrapped getData with my own callback, wanted to make it more readable to OP

mss Over a year ago

@Nope, added your suggestion too

user2066480 Over a year ago

Are both solutions asynchronous (because of the callbacks)? So I could have several functions set up like this in the same file going off at different intervals?

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