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Organizing your expressjs routes in separate files.

When you first start out build­ing nodejs/expressjs appli­ca­tions, there are a tonne of things to think about. One of the most cru­cial of them is — how to orga­nize your routes. A lot of begin­ner exam­ples start with defin­ing routes in the main file of your appli­ca­tion (app.js or server.js or index.js). Althought that helps you pick up the con­cepts quicky, you’re kinda on your own when you start build­ing your application.

In this post, I will talk about an appli­ca­tion orga­ni­za­tion struc­ture that I set­tled on. It took me some time to keep refin­ing and arrive at this stage, and it has served me well for quite some time now.

The struc­ture.

This is prob­a­bly one of the sim­plest ways in which you can orga­nize your express routes while still main­tain­ing a good level of clarity.

nodejs code organization

The app.js acts as the start­ing point of the appli­ca­tion. In this file, you instan­ti­ate
1. An instance of express — app
2. An instance of a con­fig­u­ra­tion object — appEnv. This may con­tain infor­ma­tion such as your data­base con­nec­tion, any other com­mon objects that needs to be shared by mul­ti­ple route handlers.

One of the key advan­tages of this orga­ni­za­tion is that it makes it super easy to unit test express routes since you can stub your con­fig­u­ra­tion objects for your test cases pretty easily.

We keep all of our routes han­dlers in the routes folder, orga­nized by the routes they han­dle. But there are also 2 other files -
1. index.js:- This is the default file which gets loaded when you require the routes folder, or any other folder what­so­ever. In this file, we export a func­tion which receives an app and appEnv objects as argu­ments. These argu­ments are then passed down to the indi­vid­ual route han­dler func­tions in the same man­ner which them­selves export a func­tion the same way that index does.
2. main.js: — Any arbi­trary routes that can’t be grouped together log­i­cally in their own files (like users, orders, etc).

There are other approaches that let you require all the files in the routes folder directly in one com­mand from the app.js itself instead of writ­ing mul­ti­ple require state­ments in the routes/index.js. If that works for you, its great, but I explic­itly chose to stick to the approach described above for one main rea­son — When devel­op­ing, if there’s some­thing wrong with a route, you can sim­ply turn it off by com­ment­ing out a sin­gle line in routes/index.js. Whereas if you require all the files in a folder, you lose this flex­i­bil­ity. The down­side of this approach is that when­ever you plan to expose a new route, you have to remem­ber to add it to your routes/index.js because adding it to the routes folder alone is not enough. I think I can live with that :).

The nodejs-starter-kit appli­ca­tion uses the same struc­ture as dis­cussed above. If you are start­ing out afresh, you might want to try it out.

Ryan Sukale

Ryan is just a regular guy next door trying to manage his life and finances.

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