Multiple var is node app.js

Question

Is it bad form to have multiple var calls, such as:

 var init = require('./config/init')(),
     config = require('./config/config'),
     express = require('express'),
     errorHandler = require('errorhandler'),
     bodyParser = require('body-parser'),
     expressValidator = require('express-validator'),
     mongoose = require('mongoose'),
     path = require('path'),
     _ = require('lodash'),
     passport = require('passport'),
     passport_config = require('./config/passport'),
     session = require('express-session'),
     MongoStore = require('connect-mongo')(session),
     swagger = require("swagger-node-express"),
     secrets = require('./config/secrets'),
     multer = require('multer');

Or should I set each one by itself?

Answer 1

Since you're using it to import npm modules on a global scope, it's fine. But in general, it's better practice to declare var for each variable. The reason being that missing a , will create any following variables in a global scope. For example, try catching the error in this:

var init = require('./config/init')(),
     config = require('./config/config'),
     express = require('express'),
     errorHandler = require('errorhandler'),
     bodyParser = require('body-parser')
     expressValidator = require('express-validator'),
     mongoose = require('mongoose'),
     path = require('path'),
     _ = require('lodash'),
     passport = require('passport'),
     passport_config = require('./config/passport'),
     session = require('express-session'),
     MongoStore = require('connect-mongo')(session),
     swagger = require("swagger-node-express"),
     secrets = require('./config/secrets'),
     multer = require('multer');