How do you get JSON data using $.getJSON with Node.js

问题

I'm new to Node.js. I already have a frontend javascript script that uses an API and gets weather data like so:

function getTextWeatherUsingStation(theStation){

 theURL = 'https://api.weather.gov/stations/' + theStation + '/observations/current';

    //    return new Promise((resolve, reject) => {

            $.getJSON(theURL,function(data){
            var myJSON = JSON.stringify(data)

I read that you can't just use a library as is. I converted it over to a Node.js friendly file by wrapping it in

module.exports = {

and altering the function to:

getTextWeatherUsingStation: function(theStation){

It was having problem with promise so I just commented it out as you can see. I was getting errors on the $.getJSON line and figured it was because I hadn't included jQuery so I used npm to install that.

I'm still getting this and can't figure out why:

....\drupal-8.4.5\stationFunctionsNode.js:34
            $.getJSON(theURL,function(data){
            ^

ReferenceError: $ is not defined
    at Object.getTextWeatherUsingStation (C:\Users\edwin.brown\Sites\devdesktop\drupal-8.4.5\stationFunctionsNode.js:34:13)
    at Object.<anonymous> (C:\Users\edwin.brown\Sites\devdesktop\drupal-8.4.5\nodeTestWData.js:8:18)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
    at Function.Module.runMain (module.js:684:10)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

回答1:

$.getJSON is jQuery's function for front to make http requests.

You are on backend now. So things will be little different here. This is not how you make requests from backend instead should consider using one of the native modules to make http requests which is http module and you use it like

 http.request(Options, function(res) { ...

Or if you want to use something like getJson here is get-json library that you can use like

getJSON('URL', function(error, response){..

Ofcourse you'll have to install it first with npm install get-json

then use in your project like var getJSON = require('get-json')

来源：https://stackoverflow.com/questions/50261117/how-do-you-get-json-data-using-getjson-with-node-js

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