My code looks like this
const TIME_REPEAT = 62e5
const getCities = () =>
fetch('mocky url')
.then(response => {
console.log(response)
return response.json()
})
.then(json => {
console.log('hello json:', json)
return json
})
const cities = setInterval(getCities, TIME_REPEAT)
console.log('hello cities:', cities)
output
hello cities: Timeout {
_idleTimeout: 6200000,
_idlePrev: [TimersList],
_idleNext: [TimersList],
_idleStart: 4013,
_onTimeout: [Function: getCities],
_timerArgs: undefined,
_repeat: 6200000,
_destroyed: false,
[Symbol(refed)]: true,
[Symbol(asyncId)]: 14375,
[Symbol(triggerId)]: 0
}
Last console statement should be showing the json which I want to pass down to my express router. But I don't get the desired output.
Reason why I used setInterval was because it does not return a promise. I want to get the cities json and pass it down to my express router.
What I did without setInterval
const cities = fetch('mocky url')
.then(response => {
console.log(response)
return response.json()
})
.then(json => {
console.log('hello json:', json)
return json
})
this cities object returned a promise. But I need a proper json. What can I use or do here to?
SetInterval or say the polling approach is not a good idea to go with. That is sort of anti pattern when it comes to this sort of async handling.
You may go with async/await or promises as demonstrated below:
const exec = async function(){
const cities = await getCities();
console.log(cities)
}
exec()
or
getCities.then((cities)=>{
console.log(cities)
})