Month: Mar 2022

On API call, we usually get data from database or through Http request. Here in our API call, we get custom list of records and we add to console and check the results

when we run through postman, we can get those results and the console output results

Now , lets cancel the request in postman and check the output results

Now i cancelled the request but still the results are returned

To save the resources returning the results we can use cancellation token.

Now when we cancel a request, it will throw TaskCancelledException

By using this we are saving resources and thread pools and saving time by not running the task

Code in my Github: https://github.com/pbndru/Phani.CancellationToken

Lets build simple nodejs app with CRUD database operations

I will be using MongoDB for DB

Please install mongodb and check the server is runing by running mongo demon and mongo server:

Now, lets create a database and a table

I created phani-dev database and developers table and inserted rows.

use above commands to insert

Install the below npm packages

express, morgan, helmet, monk, body-parser, eslint, nodemon, dotenv, joi

express is a nodejs framework

morgan is a middleware logger

helmet is for HTTP header security

monk: Its a tiny layer which provides improvements for MongoDb usage

nodemon: Automatic restarting of our application when any file changes

joi: its a validator

Create an env variable file for our database

Create a schema for our database

Create a database connection

Create middleware for handling errors

Now in our main app lets use all the packages mentioned above and add a developer route

Now, lets create a developer route with CRUD operations

I created for all types of requests here

api/developers – GET – return all developers

api/developers/id – GET – return specific developer details

api/developers – POST – add a new developer

api/developers/id – PUT – update details for an existing developer

api/developers/id – DELETE – delete developer

Now, we are ready to run our application

Get all developers by running: http://localhost/3000/api/developers

Note: port is not specific

You can see statuscode with success response

Lets add a developer

Lets update an existing developer

Now lets see the updated results

I updated by adding “p” to the end

Lets DELETE a record

Now run and see the results. we will see phani b developer deleted

Thats it. hope you enjoyed the article

Code in my Github: https://github.com/pbndru/phani-express-api