superagent-use 
Global plugin support for SuperAgent.
Summary
Instead of manually calling use() for every request, use() is called automatically for every request.
Example
/* The superagent-use module returns a clone of the superagent provided with the new functionality. */
var agent = require('superagent-use')(require('superagent'));
/* A sample superagent plugin/middleware. */
var prefix = require('superagent-prefix');
agent.use(prefix('https://api.example.com'));
agent
.post('/auth')
.send({user: 'foo', pass: 'bar123'})
.on('request', function(req) {
console.log(req.url); // => https://api.example.com/auth
})
.end(function(err, res) {
//
});