auth.js

var basicAuth = require('basic-auth');

/**
 * Simple basic auth middleware for use with Express 4.x.
 *
 * @example
 * app.use('/api-requiring-auth', utils.basicAuth('username', 'password'));
 *
 * @param   {string}   username Expected username
 * @param   {string}   password Expected password
 * @returns {function} Express 4 middleware requiring the given credentials
 */
exports.basicAuth = function(username, password) {
    return function(req, res, next) {
        var user = basicAuth(req);

        if (!user || user.name !== username || user.pass !== password) {
            res.set('WWW-Authenticate', 'Basic realm=Authorization Required');
            return res.status(401).end('Authentication Failure');
        }

        next();
    };
};