Post an Array in Javascript to Node.js

Question

First thank you for trying to help me. I want to know how pass(post,get) an Array in JS to Node.js backend to parse it then. This is my Array:

var Coordinates = [
      {lat: 37.772, lng: -122.214},
      {lat: 21.291, lng: -157.821},
      {lat: -18.142, lng: 178.431},
      {lat: -27.467, lng: 153.027}
                              ];

In the real stage, this Array is created when the user click the Google map. But this Array is an example what i need to send to my Node.js backend. Thank you

Pranesh Ravi · Accepted Answer · 2016-09-24 14:15:44Z

2

You can do JSON.stringify(). This will convert your array into a string, which can be passed across the network via GET or POST. In the node server, you can parse this string and get the array using JSON.parse. Adding a working Example below

var Coordinates = [
      {lat: 37.772, lng: -122.214},
      {lat: 21.291, lng: -157.821},
      {lat: -18.142, lng: 178.431},
      {lat: -27.467, lng: 153.027}
                              ];

var a = JSON.stringify(Coordinates)
console.log('Coordinates string: ', a)

var parsed = JSON.parse(a)
console.log('Parsed Coordinates: ', parsed)

answered Sep 24, 2016 at 14:15

Pranesh Ravi

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2 Comments

Little crazy Over a year ago

How can i Parse with node.js, i have this code in my backend, but it does not work: var jsonParser = bodyParser.json() app.post(':8081/load_coordinates',jsonParser, function(request, response){ var parsed = JSON.parse(request.body) console.log(parsed); }); app.listen(8081); In my frontend i have this: function httpPOST(data) { var client = new XMLHttpRequest(); var url = "localhost:8081/load_coordinates"; client.open("POST", url, true); client.setRequestHeader("Content-Type", "application/json;charset=UTF-8"); client.send(data); }

Pranesh Ravi Over a year ago

You can do JSON.parse() in node js too.

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