Experiencing difficulty in parsing the JSON document

I am struggling with reading a .JSON file (todo.json) in my Angular.Js project. The file is stored on the server, and all static files are saved within the 'public' folder of my basic Express server. Even though I can access the todo.json file directly from the browser, I am facing difficulties in retrieving its data using JavaScript.

As someone who is new to JavaScript, any assistance or guidance on this matter would be greatly appreciated.

Below is the code snippet for jsdemo.html:

<!DOCTYPE html>
<html ng-app="demo">
 <head >
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>JavaScript Demo</title;

<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<script src="js/angular.js"></script>

<script type="text/javascript">
var myApp = angular.module("demo", []);

myApp.controller("demoCtrl", function ($scope, $http) {
var promise = $http.get("/todo.json");
promise.success(function (data) {
$scope.todos = data;
  });
});

</script>

<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
 <!--[if lt IE 9]>
  <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
  <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->   
</head>

 <body ng-controller="demoCtrl">
 <H1>This is the JavaScript demo file</H1>
 <div class="panel">
<h1>To Do</h1>
<table class="table">
<tr><td>Action</td><td>Done</td></tr>
<tr ng-repeat="item in todos">
<td>{{item.action}}</td>
<td>{{item.done}}</td>
</tr>
</table>
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<!--
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.8/angular.min.js"></script>
-->


<script src="js/bootstrap.min.js"></script>

<script src="js/todoApp.js"></script>

</body>
</html>

Here is the code from my server.js file:

//Modules===================================================
var express=require ('express');
var app=express();
var bodyParser=require('body-parser');
var methodOverride=require ('method-override');


// set our port
var port = process.env.PORT || 3000; 

// parse application/json 
app.use(bodyParser.json()); 

// parse application/vnd.api+json as json
app.use(bodyParser.json({ type: 'application/vnd.api+json' })); 

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: true })); 

// override with the X-HTTP-Method-Override header in the request. simulate DELETE/PUT
app.use(methodOverride('X-HTTP-Method-Override')); 

// set the static files location /public/img will be /img for users
app.use(express.static(__dirname + '/public')); 

app.get('/', function(req, res) {
        res.sendfile('./public/views/index.html'); // load our public/index.html file
    });


 // start app ===============================================
 // startup our app at http://localhost:3000
 app.listen(port);               

// shoutout to the user                     
console.log('Magic happens on port ' + port);

// expose app           
exports = module.exports = app;  

Answer №1

In my Node.js Express application, here is the structure of my directory:

expressTest
├── public
│   ├── css
│   │   └── bootstrap.min.css
│   ├── js
│   │   ├── angular.js
│   │   ├── bootstrap.min.js
│   │   └── todoApp.js (currently empty)
│   ├── todo.json
│   └── views
│       └── index.html
└── server.js

I have used the same versions of Twitter Bootstrap and Angular.js as indicated in your jsdemo.html. They were downloaded to my project using wget with the provided URLs.

The content of my index.html file mirrors what was shared as jsdemo.html, while my server.js code matches your original post.

Here is a snippet from my todo.json file:

[
    {
        "action": "Action #1",
        "done": false
    },
    {
        "action": "Action #2",
        "done": true
    },
    {
        "action": "Action #3",
        "done": false
    },
    {
        "action": "Action #4",
        "done": true
    }
]

All necessary dependencies for node.js have been installed. I am currently running node.js version 0.10.35.

npm install express
npm install body-parser
npm install method-override

To start the server, I executed this command in the console:

node server.js

Under these conditions, the example works fine. Accessing the URL http://localhost:3000 on my browser displays the expected table data.


If you are facing issues with your todo.json syntax, it might be similar to a problem I encountered (an extra comma prevented data from displaying). Feel free to update your post with the file contents if further assistance is needed.


UPDATE:

Your JSON object should follow this format:

[
    {
        "action": "Buy Flowers", 
        "done": false
    }, 
    {
        "action": "Get Shoes", 
        "done": false
    }, 
    {
        "action": "Collect Tickets", 
        "done": true
    }, 
    {
        "action": "Call Joe", 
        "done": false
    }
]

Remember to enclose property names within double quotes for correct syntax.

Additionally, after installing express, an error message regarding deprecated function res.sendfile was shown in my command line. Consider using res.sendFile instead for future development.

Answer №2

It appears that the server's view engine makes use of curly brackets {{ }}, similar to Angular.

  1. To customize the angular binding expression symbols, you could consider overriding them.
var myApp = angular.module("app", []).config(function($interpolateProvider){
    $interpolateProvider.startSymbol("{[").endSymbol("]}");
});

Subsequently, in your HTML, utilize:

<span>{[item.value]}</span>
  1. Alternatively, you might opt for using ng-bind.
<div ng-bind="item.value"></div>

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