Manipulate URL parameters with map() method in JavaScript

Question

I need to map through an array so i can get all the notes pushed in an array params.createdNotes can i map inside the variable sortNotes so i can have a url like below :

/api/35678&page=1&notes[]=2&notes[]=4&notes[]=5

params.createdNotes = [2, 4, 5]

instance.fetchNotes = (params) => {
    let sortNotes =  (params.createdNotes.length === 0) ? '' : '&notes[]='+params.createdNotes;
    return  instance.get(
        '/api/'+params.section+'&page='+params.currentPage+sortNotes
    )
}

I suggest using the built-in URLSearchParams API so you don't have to fiddle with (and probably mess up) creating query strings yourself. — k.tten
– k.tten, Commented Mar 24, 2023 at 15:14
If you want an answer, you have to tell us what exactly params is. It looks like params.section starts with a ?; otherwise, you wouldn't be creating a querystring. — k.tten
– k.tten, Commented Mar 24, 2023 at 15:20
section, currentPage and createdNotes are states, i gave the example of the array createdNotes because thats where i am having trouble i don't know how tu use map() to get multiple &notes[]=x in my url — Elichy
– Elichy, Commented Mar 24, 2023 at 15:23
Does this answer your question? javascript modify url parameter array — Heretic Monkey
– Heretic Monkey, Commented Mar 24, 2023 at 15:55
Does this answer your question? Adding parameters to URL, putting array in query string — k.tten
– k.tten, Commented Mar 24, 2023 at 16:07

k.tten · Accepted Answer · 2023-03-24 15:27:17Z

0

Use the built-in URLSearchParams API to take care of creating a valid querystring first. Then when we're done, call toString to get the resulting querystring.

const createdNotes = [2, 4, 5];

const params = new URLSearchParams();

createdNotes.forEach((note) => params.append("note[]", note));

console.log(params.toString());

In the context of your code:

instance.fetchNotes = (params) => {
  const params = new URLSearchParams();

  params.set("section", params.section); // or whatever
  params.set("page", params.currentPage);

  // append params
  params.createdNotes.forEach((note) => params.append("notes[]", note));

  return instance.get(
    "/api/?" + params.toString() // now we're done, turn into querystring
  );
};

answered Mar 24, 2023 at 15:27

community wiki

k.tten

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6 Comments

Heretic Monkey Over a year ago

This answer would be better suited on the duplicate

Elichy Over a year ago

params.toString() returns %5B%5D instead of [] and %26 instead of &

k.tten Over a year ago

@Elichy %5B%5D is explainable because that's the URI encoding of [], but why are you using &?

k.tten Over a year ago

@HereticMonkey I don't think the target question is suitable. I think a better one would be stackoverflow.com/questions/39664019/…

k.tten Over a year ago

@Elichy You don't need &. URLSearchParams will handle creating the final query string for you. Are you even using URLSearchParams (like my answer uses)?

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