Deno is a secure runtime for JavaScript and TypeScript based on the V8 engine and Rust programming language. It was created by Ryan Dahl, the same person who is the creator of good ol’ Node.js.

This article is not meant to teach you Deno, but it’s worth to mention its main cool features:

• Secure by default, runs in a sandbox. No file, network, or environment access, unless explicitly enabled. You need to add flags to gain permissions.
• TypeScript compiler baked in, works out of the box.
• Has built-in utilities like a dependency inspector (deno info) and a code formatter (deno fmt).
• Ships only a single executable file.
• Decentralized packages. No more NPM packages / package.json. Packages are imported from URLs and are cached on the hard drive on load.
• Extensive standard library.
• ES Modules import syntax over require syntax.
• Browser compatible API e.g. fetch.

Without further due, let's move on to next post section where we'll deploy a Deno application with MongoDB on scalable cloud platform.

Deployment

This tutorial show you how to deploy your Deno application with MongoDB database. Let's go!

Before you begin, this guide assumes the following:

• Your Operating System is macOS / Windows / Linux
• You have a Github or Gitlab account

Steps to deploy Deno with Qovery

• Web
• CLI

Sign in to the Qovery web interface.

Deployment

Deno sample application

Get a copy of the sample source code of Deno sample project by forking it.

To deploy your Deno application connected to a MongoDB, you can use our sample code and follow the configuration steps.

In this example we are using MongoDB v3.6.

1. Create a new project

   

2. Create a new environment

   

3. Create a new application

   To follow the guide, you can fork and use our repository

   Use the forked repository (and branch master) while creating the application in the repository field:

   

4. Select application port

   After the application is created:

   • Navigate application settings
   • Select Port
   • Add port 8080

   

5. Use Dockerfile

   In the settings General section, set Build Mode to Dockerfile and set Dockerfile path as "Dockerfile"

6. Deploy a MongoDB database

   In your envioronment view, click on Add and Database buttons:

   

   In the popup window while adding a database, choose your name, select MongoDB and 3.6 version.

   

   To learn how to add a MongoDB database in more details, you can follow this guide.

7. Connect Deno to MongoDB

   Credentials of your MongoDB database are available via Environment Variables and Secrets. Qovery injects environment vars at the runtime.

   You can learn more about environment variables and secrets here.

   To list all the environment variables available to your Deno application, you can open Environment Variables and Secret tabs in your application window:

   

   In the Secrets section, you'll see all names of injected database secrets, including those for the previously created MongoDB database. To connect the Deno app to the MongoDB database, you need to setup the application to use those secrets.

   All you have to do is to open and edit database configuration file in your forked repository. Replace all the QOVERY_DATABASE_XXX variables with values you have in your own environment. Those variable keys contain your database ID, this is why you need to update the file.

   TIP: you could also make use of Variable Aliases to change the name of used environment variables in your Deno application. Learn more here.

8. Deploy the app on Qovery

   All you have to do now is to navigate to your application and click Deploy button

   

   That's it. Watch the status and wait till the app is deployed.

How was it? Did this tutorial work?  Yes  No

Congratulations! Your environment with Deno application and MongoDB database should be in progress.

Trigger a new deployment

Now, you can play with the sample Deno application and commit & push your changes. Qovery detects your actions and triggers new builds and application deployments. Any change you make will be reflected in your deployed application automatically.

Conclusion

Congratulations! Now, you know how to deploy your Deno app with MongoDB in just a few steps.

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