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I just started working with node.js and json objects in my college course. One of our assignments this week was to create a few json objects and extract parts of the object into an html page. I thought I had a good grasp on how to do this, but I am running into an error when I try to start node. If I remove the colleges object and the parse statement then node runs fine.
Here is the error I get when I run "node index.js":
undefined:1
[object Object],[object Object],[object Object],[object Object],[object Object
^
SyntaxError: Unexpected token o
at Object.parse (native)
at Object.<anonymous> (/home/ubuntu/node_stuff/node_json/requestHandlers.js:13:20)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/home/ubuntu/node_stuff/node_json/index.js:3:23)
at Module._compile (module.js:449:26)
And here is the code I am working with.
var querystring = require("querystring"),
fs = require("fs"),
formidable = require("formidable");
var colleges = [
{"name":"A-B Tech","street":"340 Victoria Road","city":"Asheville","state":"NC","zip":"28801","phone":"828-254-1921"},
{"name":"UNC Asheville","street":"1 University Heights","city":"Asheville","state":"NC","zip":"28804","phone":"828-251-6600"},
{"name":"UNC Charlotte","street":"9201 University City Blvd","city":"Charlotte","state":"NC","zip":"28223","phone":"704-687-8622"},
{"name":"Western Carolina","street":"North Carolina 107","city":"Cullowhee","state":"NC","zip":"28723","phone":"877-928-4968"},
{"name":"NC State","street":"2200 Hillsborough","city":"Raleigh","state":"NC","zip":"27695","phone":"919-515-2011"}
];
var college = JSON.parse(colleges);
function abtech(response) {
console.log("Request handler 'abtech' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" '+
'content="text/html; charset=UTF-8" />'+
'</head>'+
'<body>'+
'<ul>'+
'<li>' + college[0].name + '</li>'+
'<li>' + college[0].street + '</li>'+
'<li>' + college[0].city + ' ' + college[0].state + ' ' + college[0].zip + '</li>'+
'<li>' + college[0].phone + '</li>'+
'</ul>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function unca(response) {
console.log("Request handler 'abtech' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" '+
'content="text/html; charset=UTF-8" />'+
'</head>'+
'<body>'+
'<ul>'+
'<li></li>'+
'<li></li>'+
'<li></li>'+
'<li></li>'+
'</ul>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function home(response) {
console.log("Request handler 'home' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" '+
'content="text/html; charset=UTF-8" />'+
'</head>'+
'<body>'+
'<h1>Welcome to College</h2>'+
'<p>Where would you like to visit?</p>'+
'<ul>'+
'<li><a href="/colleges">Colleges</a></li>'+
'<li><a href="/hours">Hours of Operation</a></li>'+
'<li><a href="/start">Upload a Photo</a></li>'+
'<li><a href="/show">View Gallery</a></li>'+
'</ul>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function colleges(response) {
console.log("Request handler 'colleges' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" '+
'content="text/html; charset=UTF-8" />'+
'</head>'+
'<body>'+
'<h1>Colleges</h2>'+
'<ul>'+
'<li><a href="/abtech">A-B Tech</a></li>'+
'<li><a href="/unca">UNC Asheville</a></li>'+
'<li><a href="/uncc">UNC Charlotte</a></li>'+
'<li><a href="/wcu">Western Carolina</a></li>'+
'<li><a href="/ncsu">NC State</a></li>'+
'</ul>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function hours(response) {
console.log("Request handler 'gallery' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" '+
'content="text/html; charset=UTF-8" />'+
'</head>'+
'<body>'+
'<h1>Hours of Operation</h2>'+
'<table>'+
'<tr><td>Monday - Thursday</td><td>9 a.m. - 7 p.m.</td></tr>'+
'<tr><td>Friday</td><td>9 a.m. - 5 p.m.</td></tr>'+
'<tr><td>Saturday</td><td>9 a.m. - 12 p.m.</td></tr>'+
'</table>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function start(response) {
console.log("Request handler 'start' was called.");
var body = '<html>'+
'<head>'+
'<meta http-equiv="Content-Type" '+
'content="text/html; charset=UTF-8" />'+
'</head>'+
'<body>'+
'<h1>Upload a file</h2>'+
'<p>It will be shown on the /show url after</p>'+
'<form action="/upload" enctype="multipart/form-data" '+
'method="post">'+
'<input type="file" name="upload" multiple="multiple">'+
'<input type="submit" value="Upload file" />'+
'</form>'+
'</body>'+
'</html>';
response.writeHead(200, {"Content-Type": "text/html"});
response.write(body);
response.end();
}
function upload(response, request) {
console.log("Request handler 'upload' was called.");
var form = new formidable.IncomingForm();
console.log("about to parse");
form.parse(request, function(error, fields, files) {
console.log("parsing done");
/* Possible error on Windows systems:
tried to rename to an already existing file */
fs.rename(files.upload.path, "/home/ubuntu/node_stuff/node_assignment/test.jpg", function(err) {
if (err) {
fs.unlink("/home/ubuntu/node_stuff/node_assignment/test.jpg")
fs.rename(files.upload.path, "/home/ubuntu/node_stuff/node_assignment/test.jpg");
}
});
response.writeHead(200, {"Content-Type": "text/html"});
response.write("received image:<br/>");
response.write("<img src='/show' />");
response.end();
});
}
function show(response) {
console.log("Request handler 'show' was called.");
fs.readFile("/home/ubuntu/node_stuff/node_assignment/test.jpg", "binary", function(error, file) {
if(error) {
response.writeHead(500, {"Content-Type": "text/plain"});
response.write(error + "\n");
response.end();
} else {
response.writeHead(200, {"Content-Type": "image/jpg"});
response.write(file, "binary");
response.end();
}
});
}
exports.start = start;
exports.upload = upload;
exports.show = show;
exports.home = home;
exports.colleges = colleges;
exports.hours = hours;
exports.abtech = abtech;
Any hints about what I am doing wrong would be very much appreciated. My instructor is tough to get a hold of during the weekend, so I don't really have anywhere else to turn. Thank you.
824
Your colleges variable is already a valid JavaScript Object. You do not have to use JSON.parse on it.
JSON.parse expects a String as first argument, but you provide an Object. Thus it is coerced to a String looking like the one you see in the Error message.
For the rest of your code, you might want to take a look at Express or Zappa to be able to write the code a bit more compact ;)
93
the solution is to use JSON.stringify as follows
var target=JSON.parse(JSON.stringify(source));
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