How to get JSON from URL in JavaScript?
JavascriptJsonJavascript Problem Overview
This URL returns JSON:
{
query: {
count: 1,
created: "2015-12-09T17:12:09Z",
lang: "en-US",
diagnostics: {},
...
}
}
I tried this, and it didn't work:
responseObj = readJsonFromUrl('http://query.yahooapis.com/v1/publ...');
var count = responseObj.query.count;
console.log(count) // should be 1
How can I get a JavaScript object from this URL's JSON response?
Javascript Solutions
Solution 1 - Javascript
You can use jQuery .getJSON()
function:
$.getJSON('http://query.yahooapis.com/v1/public/yql?q=select%20%2a%20from%20yahoo.finance.quotes%20WHERE%20symbol%3D%27WRC%27&format=json&diagnostics=true&env=store://datatables.org/alltableswithkeys&callback', function(data) {
// JSON result in `data` variable
});
If you don't want to use jQuery you should look at this answer for pure JS solution.
Solution 2 - Javascript
If you want to do it in plain javascript, you can define a function like this:
var getJSON = function(url, callback) {
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'json';
xhr.onload = function() {
var status = xhr.status;
if (status === 200) {
callback(null, xhr.response);
} else {
callback(status, xhr.response);
}
};
xhr.send();
};
And use it like this:
getJSON('http://query.yahooapis.com/v1/public/yql?q=select%20%2a%20from%20yahoo.finance.quotes%20WHERE%20symbol%3D%27WRC%27&format=json&diagnostics=true&env=store://datatables.org/alltableswithkeys&callback',
function(err, data) {
if (err !== null) {
alert('Something went wrong: ' + err);
} else {
alert('Your query count: ' + data.query.count);
}
});
Note that data
is an object, so you can access its attributes without having to parse it.
Solution 3 - Javascript
With Chrome, Firefox, Safari, Edge, and Webview you can natively use the fetch API which makes this a lot easier, and much more terse.
If you need support for IE or older browsers, you can also use the fetch polyfill.
let url = 'https://example.com';
fetch(url)
.then(res => res.json())
.then(out =>
console.log('Checkout this JSON! ', out))
.catch(err => throw err);
Even though Node.js does not have this method built-in, you can use node-fetch which allows for the exact same implementation.
Solution 4 - Javascript
ES8(2017) try
obj = await (await fetch(url)).json();
async function load() {
let url = 'https://my-json-server.typicode.com/typicode/demo/db';
let obj = await (await fetch(url)).json();
console.log(obj);
}
load();
you can handle errors by try-catch
async function load() {
let url = 'http://query.yahooapis.com/v1/publ...';
let obj = null;
try {
obj = await (await fetch(url)).json();
} catch(e) {
console.log('error');
}
console.log(obj);
}
load();
Solution 5 - Javascript
Axios is a promise based HTTP client for the browser and node.js.
It offers automatic transforms for JSON data and it's the official recommendation from the Vue.js team when migrating from the 1.0 version which included a REST client by default.
> Performing a GET
request
>
> // Make a request for a user with a given ID
> axios.get('http://query.yahooapis.com/v1/publ...';)
> .then(function (response) {
> console.log(response);
> })
> .catch(function (error) {
> console.log(error);
> });
Or even just axios(url)
is enough as a GET
request is the default.
Solution 6 - Javascript
Define a function like:
fetchRestaurants(callback) {
fetch(`http://www.restaurants.com`)
.then(response => response.json())
.then(json => callback(null, json.restaurants))
.catch(error => callback(error, null))
}
Then use it like this:
fetchRestaurants((error, restaurants) => {
if (error)
console.log(error)
else
console.log(restaurants[0])
});
Solution 7 - Javascript
async function fetchDataAsync(url) {
const response = await fetch(url);
console.log(await response.json());
}
fetchDataAsync('paste URL');
Solution 8 - Javascript
this morning, i also had the same doubt and now its cleared i had just used JSON with 'open-weather-map'(https://openweathermap.org/) api and got data from the URL in the index.html file, the code looks like this:-
//got location
var x = document.getElementById("demo");
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(weatherdata);
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
//fetch openweather map url with api key
function weatherdata(position) {
//put corrdinates to get weather data of that location
fetch('https://api.openweathermap.org/data/2.5/weather?lat='+position.coords.latitude+'&lon='+position.coords.longitude+'&appid=b2c336bb5abf01acc0bbb8947211fbc6';)
.then(response => response.json())
.then(data => {
console.log(data);
document.getElementById("demo").innerHTML =
'
wind speed:-'+data.wind.speed +
'
humidity :-'+data.main.humidity +
'
temprature :-'+data.main.temp
});
}
<div id="demo"></div>
i had give api key openly because i had free subscription, just have a free subscriptions in beginning. you can find some good free api's and keys at "rapidapi.com"
Solution 9 - Javascript
as @DanAlboteanu answer in this page and some error corection of that javascript my suggested code is:
fetchRestaurants((error, data) => {
if (error)
console.log(error);
else
console.log(data)
});
and fetchRestaurants method is(please replace your json url with {your url of json data}):
function fetchRestaurants(callback) {
fetch("{your url of json data}")
.then(response => response.json())
.then(json => callback(null, json))
.catch(error => callback(error, null))
}
Solution 10 - Javascript
You can access JSON data by using fetch() in JavaScript
Update url parameter of fetch() with your url.
fetch(url)
.then(function(response){
return response.json();
})
.then(function(data){
console.log(data);
})
Hope It helps, it worked perfectly for me.
Solution 11 - Javascript
//Resolved
const fetchPromise1 = fetch(url);
fetchPromise1.then(response => {
console.log(response);
});
//Pending
const fetchPromise = fetch(url);
console.log(fetchPromise);