内容简介:Fedora Workstation uses GNOME Shell by default and this one was mainly written in JavaScript.JavaScript is famous as a language of front-end development but this time we‘ll show it‘s usage for back-end.We‘ll implement a new API using the following technolo
Fedora Workstation uses GNOME Shell by default and this one was mainly written in JavaScript.
JavaScript is famous as a language of front-end development but this time we‘ll show it‘s usage for back-end.
We‘ll implement a new API using the following technologies: JavaScript, Express and Fedora Workstation. A web browser is being used to call the service (eg. Firefox from the default Fedora WS distro).
Installing of necessary packages
Check: What we already have?
$ npm -v $ node -v
Maybe we already have both of them installed and can skip the next 2 install steps.
Setup dnf repo
$ sudo dnf install -y gcc-c++ make $ curl -sL https://rpm.nodesource.com/setup_12.x | sudo -E bash -
Install Node.js
$ sudo dnf install nodejs
A new simple service (low-code style)
Let‘s navigate to our working directory (‚work‘) and create a new directory for our new sample back-end app.
$ cd work $ mkdir newApp $ cd newApp $ npx express-generator
## This one generates an application skeleton for us
$ npm i
## installs dependencies
Please mind the security warnings – never use this one for production.
Crack open the routes/users.js
Modify line #6 to:
res.send(data);
Insert this code block below var router …
let data = { '1':'Ann', '2': 'Bruno', '3': 'Celine' }
Save the modified file.
We modified a route and added a new variable data. This one could be declared as a const as we didn‘t modify it anywhere.
The result:
Running the service on your local Fedora workstation machine
$ npm start
Note: The application entry point is bin/www. You may want to change the port number there.
Calling our new service
Let‘s launch our Firefox browser and type-in:
http://localhost:3000/users
It‘s also possible to leverage the Developer tools (F12 – Network tab – select the related GET request and look at the side bar response tab) to check the data.
Conclusion
Now we have got a service and and an unnecessary index accessible through localhost:3000/.
How to get quickly rid of this one?
1) remove ‚views‘ directory
2) remove ‚public‘ directory
3) remove routes/index.js
4) inside app.js file:
modify the line 37 to: res.status(err.status || 500).end();
remove the next line res.render(‘error’)
Restart the service
$ npm start
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