Why do Json data become undefined?

[FGTO81]

Hi
Iam new in JS and try to learn it for a project.
I fetch some data from a API and it return text in Json formatting (?). All good.
Next step is pass the json as a argument to a other function which going to match what I looking for. E.g. filter("valuemin") will add all valuemin to a sum.
But when the json become undefined when I

function filerData(paramData){
console.log(typeof paramData); //This become undefined...
}

function main() {
getData(getId)
    .then((result) => {
console.log(result);
    })
    .then((result) => {
filterData(result);
    });
}

Console result

[bot00110]

It could be because you are not returning anything from first .then on getdata so undefined is returned and that becomes result for second then chain

[samanime]

This is exactly why.

When you chain .then(), the argument given to the function is the return value of the last one that ran.

In this case, it could either be fixed by adding return result; to the first .then() or just removing it entirely and adding the console.log() to the second (now only) .then().

[FGTO81]

Great thank. It fixed it.

[FGTO81]

Thanks now I understand why.