I was trying to use react starter kit.
Few hours ago I was able to run my html code on local server. I started server by "node server.js". But now I am not able to run my application.
When ever I try to run it I shows a web page like this. I am getting error like this when I am running "node server.js".
I know this means that port 3000 is already in use but things doesn't work when I start it for the first time also. All this was working few hours ago.
server.js
var fs = require('fs');
var path = require('path');
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
var COMMENTS_FILE = path.join(__dirname, 'comments.json');
app.set('port', (process.env.PORT || 3000));
app.use('/', express.static(path.join(__dirname, 'public')));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
// Additional middleware which will set headers that we need on each request.
app.use(function(req, res, next) {
// Set permissive CORS header - this allows this server to be used only as
// an API server in conjunction with something like webpack-dev-server.
res.setHeader('Access-Control-Allow-Origin', '*');
// Disable caching so we'll always get the latest comments.
res.setHeader('Cache-Control', 'no-cache');
next();
});
app.get('/api/comments', function(req, res) {
fs.readFile(COMMENTS_FILE, function(err, data) {
if (err) {
console.error(err);
process.exit(1);
}
res.json(JSON.parse(data));
});
});
app.post('/api/comments', function(req, res) {
fs.readFile(COMMENTS_FILE, function(err, data) {
if (err) {
console.error(err);
process.exit(1);
}
var comments = JSON.parse(data);
// NOTE: In a real implementation, we would likely rely on a database or
// some other approach (e.g. UUIDs) to ensure a globally unique id. We'll
// treat Date.now() as unique-enough for our purposes.
var newComment = {
id: Date.now(),
author: req.body.author,
text: req.body.text,
};
comments.push(newComment);
fs.writeFile(COMMENTS_FILE, JSON.stringify(comments, null, 4), function(err) {
if (err) {
console.error(err);
process.exit(1);
}
res.json(comments);
});
});
});
app.listen(app.get('port'), function() {
console.log('Server started: http://localhost:' + app.get('port') + '/');
});
Here is hello.html
<!-- index.html -->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>React Tutorial</title>
<script src="https://npmcdn.com/react@15.3.0/dist/react.js"></script>
<script src="https://npmcdn.com/react-dom@15.3.0/dist/react-dom.js"></script>
<script src="https://npmcdn.com/babel-core@5.8.38/browser.min.js"></script>
<script src="https://npmcdn.com/jquery@3.1.0/dist/jquery.min.js"></script>
<script src="https://npmcdn.com/remarkable@1.6.2/dist/remarkable.min.js"></script>
</head>
<body>
<div id="content"></div>
<script type="text/babel">
// tutorial1.js
var CommentBox = React.createClass({
render: function() {
return (
<div className="commentBox">
Hello, world! I am a CommentBox.
</div>
);
}
});
ReactDOM.render(
<CommentBox />,
document.getElementById('content')
);
// To get started with this tutorial running your own code, simply remove
// the script tag loading scripts/example.js and start writing code here.
</script>
</body>
</html>
