posting a javascript array as a an array of JSON objects

Question

I am posting to a rails controller an array of json objects via a jQuery ajax request. Do I need to use JSON.stringify or should jQuery handle it for me?

  var vals = [{"name":"item name #1"},{"name":"item name #2"}];
  $.ajax({
    url: '/arc/api/v1/calculate_items',
    type: 'POST',
    data: {line_items: vals},
    dataType: 'json'
  }).done(function(r){

vs

  var vals = [{"name":"item name #1"},{"name":"item name #2"}];
  $.ajax({
    url: '/arc/api/v1/calculate_items',
    type: 'POST',
    data: {line_items: JSON.stringify(vals)},
    dataType: 'json'
  }).done(function(r){

using JSON.stringify seemed to work but would like to hear something more definitive. — timpone
– timpone, Commented May 31, 2017 at 4:01

Roman Kiselenko · Accepted Answer · 2017-05-31 04:14:03Z

1

Do I need to use JSON.stringify?

You need to use JSON.stringify to first serialize your object(or an array of objects) to JSON, and then specify the content-type so your server understands it's JSON.

jQuery handle it for me?

No, it is not.

There are two jQuery method which does it automaticly, getJSON, post

$.getJSON("/some/url", function(data) { 
   // the data is already a plain JSON object
})


var data = /* Your data in JSON format - see below */;
$.post("/some/url", data, function(returnedData) {
  // the returnedData is already a plain JSON object    
})

edited May 31, 2017 at 4:14

answered May 31, 2017 at 4:08

Roman Kiselenko

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