What is deno?

Deno is secure run time for javascript & typescript. Deno aims to provides secure scripting environment. It is built on top of V8 engine, Rust and TypeScript. Also deno supports typescript out of the box.

Goal

• Create a simple todo rest api.
• Use oak middleware for routing etc,
• Expose routes for GET, POST, DELETE and PUT methods.

Demo

API list

• GET - /
• GET - /todos
• POST - /todos (form data)
• PUT - /todos/:id (form data)
• DELETE - /todos/:id

Project structure

.
├── Dockerfile
├── LICENSE
├── README.md
├── config.js
├── controllers
│   └── todos
│       ├── delete.js
│       ├── get.js
│       ├── post.js
│       └── put.js
├── data
│   └── todos.json
├── fly.toml
├── index.js
└── router.js

Source code

Install & Run

Step 1: Install

curl -fsSL https://deno.land/x/install/install.sh | sh

Step 2: Run

deno run --allow-net --allow-read --allow-write ./index.js

Note:

--allow-net is to allow network access
--allow-read is to allow read access to file system
--allow-write is to write to file system.

Step 3: Open https://localhost:8080

Step 4 (optional): denon for deno like nodemon for node

deno install --unstable --allow-read --allow-run -f https://deno.land/x/denon/denon.ts

denon ./index.js

Note:

Denon uses .denonrc.json file in root for configuration

Step 5 (optional): To run using docker

docker build -t app . && docker run -it --init -p 8080:8080 app

Deployment

Deployed using https://fly.io/ with docker.

Deploy in 4 steps

1. Install Flyctl - you'll need it.

2. Sign up/Log in to Fly - run flyctl auth signup to create an account or flyctl auth login to log in.

3. Run flyctl apps create - let Fly generate you a name (recommended) or enter one of your own. Generates fly.toml file with config.

4. Run flyctl deploy - To deploy

Run flyctl info - Fly will deployment details.

Hope this post was helpful. If you have any questions or query comment below.

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