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Simple REST API with Deno

Mohamed Amine Griche on May 14, 2020

After 2 years of its first release, Deno v1.0 is finally here. So, what is Deno anyway ? Deno is a simple, modern and secure runtime...

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Arthur Zhuk • May 18 '20 • Edited

Thanks for the simple proof-of-concept. How are you liking Deno so far? Do you see yourself using it in the future over Node?

Don't forget the import in app.ts

import router from './routes.ts'

Mohamed Amine Griche • May 18 '20 • Edited

I like it, and I love the built in typescript support, do I see myself using it in the future over node? maybe in the future.
Thank you

Hagop Jamkojian • May 23 '20 • Edited

Thanks for the article, it was really helpful.
Taking this as a starting point, I created a similar Deno project that stores the data in MongoDB.
Have a look at it and let me know what you think: github.com/hagopj13/deno-books-api

Jlomaka • Feb 15 '21

any, really ? Why then do you use TS, it would be better to write to JS right away, since there is no minute to go in and read which interface to use in request and response. For those who are also confused by this, here are the interface to import for these parameters:

import {Request, Response} from "https://deno.land/x/oak/mod.ts";

Typing was not invented to simply ignore it, it was created to exclude a very large number of bugs at the time of writing before writing tests.

Mohamed Amine Griche • Feb 21 '21

I totally agree with you and I am sorry for the bad practices in the code.
This was not supposed to be full fledged, secure, scalable app, it is just a simple demonstration on how you can create a simple deno REST, as simple as that.

Luke Secomb • May 15 '20

Great article.

Might need to add those last few lines to the controller.ts file.

/* return the book if found and undefined if not */
const searchBookByIsbn = (isbn: string): ( IBook | undefined ) => books.filter(book => book.isbn === isbn )[0]

export { getBooks, getBook, addBook, updateBook, deleteBook }

Mohamed Amine Griche • May 15 '20

Ah yes, Thank you.

Rudy Sarmiento • May 15 '20

Hey,
you also left out:

const app = new Application()

app.use(router.routes())
app.use(router.allowedMethods())

console.log(`Listening on port ${PORT} ...`)
await app.listen(`${HOST}:${PORT}`)

Mohamed Amine Griche • May 15 '20

Thank you.

PauloTumba • May 22 '20

const getBook = ({ params, response }: { params: { isbn: string }; response: any }) => {
const book: IBook | undefined = searchBookByIsbn(params.isbn)
let indece:any;

indece=params.isbn
let index=indece-1

if (book) {

response.status = 200
response.body = books[index]

} else {
response.status = 404
response.body = { message: Book not found. }
}

}

i made some changes, on get by id it was returning only the first register

Francisco Quintero 🇨🇴 • May 15 '20

Writing TS code is mandatory or optional in Deno?

Rudy Sarmiento • May 15 '20

optional
deno.land/manual/getting_started/t...

Peter Storm • May 18 '20

I'm a TS noob, but a Haskell intermediate. Is it really not possible to give types to request and response? Is there a library for that?

Great guide though!

Ramki A • Jun 14 '20

Great article. @vincent Mancini
May i know which tool you're for API testing.
Thanks

Mohamed Amine Griche • Jun 14 '20

I used "Servistate HTTP Editor & REST API Client" a chrome extension.

Parth Kharecha • May 20 '20

Thank you Vincent Mancini for example
I have tested this example ane add new small changes
here is the git repository link: github.com/parthkharecha/denojs-ap...

teraaret • May 23 '20

There is error in getBook method:

response.body = books[0]

must be:

response.body = book