[javascript] Setting query string using Fetch GET request

I'm trying to use the new Fetch API:

I am making a GET request like this:

var request = new Request({
  url: 'http://myapi.com/orders',
  method: 'GET'
});
fetch(request);

However, I'm unsure how to add a query string to the GET request. Ideally, I want to be able to make a GET request to a URL like:

'http://myapi.com/orders?order_id=1'

In jQuery I could do this by passing {order_id: 1} as the data parameter of $.ajax(). Is there an equivalent way to do that with the new Fetch API?

Template literals are also a valid option here, and provide a few benefits.

You can include raw strings, numbers, boolean values, etc:

    let request = new Request(`https://example.com/?name=${'Patrick'}&number=${1}`);

You can include variables:

    let request = new Request(`https://example.com/?name=${nameParam}`);

You can include logic and functions:

    let request = new Request(`https://example.com/?name=${nameParam !== undefined ? nameParam : getDefaultName() }`);

As far as structuring the data of a larger query string, I like using an array concatenated to a string. I find it easier to understand than some of the other methods:

let queryString = [
  `param1=${getParam(1)}`,
  `param2=${getParam(2)}`,
  `param3=${getParam(3)}`,
].join('&');

let request = new Request(`https://example.com/?${queryString}`, {
  method: 'GET'
});

var paramsdate=01+'%s'+12+'%s'+2012+'%s';

request.get("https://www.exampleurl.com?fromDate="+paramsDate;

Maybe this is better:

const withQuery = require('with-query');

fetch(withQuery('https://api.github.com/search/repositories', {
  q: 'query',
  sort: 'stars',
  order: 'asc',
}))
.then(res => res.json())
.then((json) => {
  console.info(json);
})
.catch((err) => {
  console.error(err);
});

Was just working with Nativescript's fetchModule and figured out my own solution using string manipulation. Append the query string bit by bit to the url. Here is an example where query is passed as a json object (query = {order_id: 1}):

function performGetHttpRequest(fetchLink='http://myapi.com/orders', query=null) {
    if(query) {
        fetchLink += '?';
        let count = 0;
        const queryLength = Object.keys(query).length;
        for(let key in query) {
            fetchLink += key+'='+query[key];
            fetchLink += (count < queryLength) ? '&' : '';
            count++;
        }
    }
    // link becomes: 'http://myapi.com/orders?order_id=1'
    // Then, use fetch as in MDN and simply pass this fetchLink as the url.
}

I tested this over a multiple number of query parameters and it worked like a charm :) Hope this helps someone.

let params = {
  "param1": "value1",
  "param2": "value2"
};

let query = Object.keys(params)
             .map(k => encodeURIComponent(k) + '=' + encodeURIComponent(params[k]))
             .join('&');

let url = 'https://example.com/search?' + query;

fetch(url)
  .then(data => data.text())
  .then((text) => {
    console.log('request succeeded with JSON response', text)
  }).catch(function (error) {
    console.log('request failed', error)
  });

I know this is stating the absolute obvious, but I feel it's worth adding this as an answer as it's the simplest of all:

const orderId = 1;
fetch('http://myapi.com/orders?order_id=' + orderId);

You can use #stringify from query string

import { stringify } from 'query-string';

fetch(`https://example.org?${stringify(params)}`)

A concise ES6 approach:

fetch('https://example.com?' + new URLSearchParams({
    foo: 'value',
    bar: 2,
}))

URLSearchParams's toString() function will convert the query args into a string that can be appended onto the URL. In this example, toString() is called implicitly when it gets concatenated with the URL. You will likely want to call toString() explicitly to improve readability.

IE does not support URLSearchParams (or fetch), but there are polyfills available.

If using node, you can add the fetch API through a package like node-fetch. URLSearchParams comes with node, and can be found as a global object since version 10. In older version you can find it at require('url').URLSearchParams.

As already answered, this is per spec not possible with the fetch-API, yet. But I have to note:

If you are on node, there's the querystring package. It can stringify/parse objects/querystrings:

var querystring = require('querystring')
var data = { key: 'value' }
querystring.stringify(data) // => 'key=value'

...then just append it to the url to request.

However, the problem with the above is, that you always have to prepend a question mark (?). So, another way is to use the parse method from nodes url package and do it as follows:

var url = require('url')
var data = { key: 'value' }
url.format({ query: data }) // => '?key=value'

See query at https://nodejs.org/api/url.html#url_url_format_urlobj

This is possible, as it does internally just this:

search = obj.search || (
    obj.query && ('?' + (
        typeof(obj.query) === 'object' ?
        querystring.stringify(obj.query) :
        String(obj.query)
    ))
) || ''

encodeQueryString — encode an object as querystring parameters

/**
 * Encode an object as url query string parameters
 * - includes the leading "?" prefix
 * - example input — {key: "value", alpha: "beta"}
 * - example output — output "?key=value&alpha=beta"
 * - returns empty string when given an empty object
 */
function encodeQueryString(params) {
    const keys = Object.keys(params)
    return keys.length
        ? "?" + keys
            .map(key => encodeURIComponent(key)
                + "=" + encodeURIComponent(params[key]))
            .join("&")
        : ""
}

encodeQueryString({key: "value", alpha: "beta"})
 //> "?key=value&alpha=beta"

Solution without external packages

to perform a GET request using the fetch api I worked on this solution that doesn't require the installation of packages.

this is an example of a call to the google's map api

// encode to scape spaces
const esc = encodeURIComponent;
const url = 'https://maps.googleapis.com/maps/api/geocode/json?';
const params = { 
    key: "asdkfñlaskdGE",
    address: "evergreen avenue",
    city: "New York"
};
// this line takes the params object and builds the query string
const query = Object.keys(params).map(k => `${esc(k)}=${esc(params[k])}`).join('&')
const res = await fetch(url+query);
const googleResponse = await res.json()

feel free to copy this code and paste it on the console to see how it works!!

the generated url is something like:

https://maps.googleapis.com/maps/api/geocode/json?key=asdkf%C3%B1laskdGE&address=evergreen%20avenue&city=New%20York

this is what I was looking before I decided to write this, enjoy :D