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Nodejs Express Examples

See also

Generate Express project

npm install express-generator -g

express         # Create boiler plate

Enabling CORS in Express

To set CORS headers add an app.use() block like this
app.use(function (req, res, next) {
    res.setHeader('Access-Control-Allow-Origin', 'http://server:8080');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
    res.setHeader('Access-Control-Allow-Credentials', true);
    next();
});

Debugging Express Applications

Ensure to install the 'debug' module
npm install debug
And the run with debugging enabled by setting the DEBUG environment variable like this
DEBUG=express:* node index.js
DEBUG=http,mail,express:* node index.js

DEBUG=<app name>  node ./bin/www

DEBUG_FD=3 node index.js 3> logfile
Debugging code would look like
    d = debug('http:instance1');

    d('Some logged event');
    d('Another logged event');