Using just one design pattern in application

I'm trying to learn how to make my application has the same "face" in all files, the same pattern, but I do not know if this is the right thing to do.

I want know if the more correct in software development, is to limit the application to only one type of pattern.

For example, that's how my application looks like (just a piece)

Api.js:

'use strict'
var Server = require('./server');
var Api = {
 init: function() {
   Server.init('start');
 }
};

Server.js:

'use strict'
var Server = {
 init: function(command) {
  this.command = command;

  if (command === 'start') {
    this.start();
  }
 }
};

I'm using the "initializer object pattern" in all my application. So i'm avoiding decorator pattern, facade, everything.

Should i avoid or i can use more than one? If the right answer is use several, depending on the needs, i have other question. This doesn't make the maintenance more difficult? Is not make the code like a spaghetti?

Thanks.