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Making a Deno project
Deno has many built in tools to make your development experience as smooth as possible. One of these tools is the project initializer, which creates a new Deno project with a basic file structure and configuration.
While you are welcome to use JavaScript, Deno has built-in support for
TypeScript as well, so we'll be using
TypeScript in this guide. If you'd prefer to use JavaScript, you can rename the
files to .js and remove the type annotations.
Initialize a new project Jump to heading
To initialize a new Deno project, run the following command in your terminal:
deno init my_project
This will create a new directory called my_project with the following
structure:
my_project
├── deno.json
├── main_test.ts
└── main.ts
A deno.json file is created to
configure your project, and two
TypeScript files are created; main.ts and main_test.ts. The main.ts file
is where you'll write your application code, on initial creation it will contain
a simple program which adds two numbers together. The main_test.ts file is
where you can write tests, initially it will contain a test for your addition
program.
Run your project Jump to heading
You can run this program with the following command:
$ deno run main.ts
Add 2 + 3 = 5
Run your tests Jump to heading
Deno has a built in test runner. You can write
tests for your code and run them with the deno test command. Run the tests in
your new project with:
$ deno test main_test.ts
running 1 test from ./main_test.ts
addTest ... ok (1ms)
ok | 1 passed | 0 failed (3ms)
Now that you have a basic project set up you can start building your application. Check out our tutorials and examples for more ideas on what to build with Deno.