expressjs

Export MongoDB Collection Data In CSV From Node Express Mongoose Application

Last Updated August 4, 2021 | 2 minutes | 371 words | Talha Awan

Suppose a student collection in mongoDB have some data that we want to export in a CSV file from a Mongoose, Node, and Express app. For simplicity, let us assume only two fields in Mongoose schema: lastName and firstName. To export a CSV file, install moment, json2csv, and mongo-date-query (optional) npm packages: [Read More]

Validate Uploaded CSV Data in Node Express

Confirm existence and data type of all columns within each row.

Last Updated July 10, 2021 | 3 minutes | 564 words | Talha Awan

Continuing from earlier post Node Express Endpoint to Upload and Process CSV File, in this post we will add validation to the uploaded CSV data. With the same index.js file and settings as the earlier post, we only need to add moment library for date validation. [Read More]

nodejs expressjs csv

Integrate Polling Based API In Node/Express Js

Last Updated July 10, 2021 | 5 minutes | 1050 words | Talha Awan

At times we need to integrate in our Node/Express application third party APIs that have implemented polling mechanism i.e. they only send back results once available; the client must keep on attempting until the service has put together all the results to return. [Read More]

nodejs expressjs polling

Unit Testing Expressjs Controller (Part 2)

Detailed Example Of Express Mongoose Update API

Last Updated July 23, 2021 | 12 minutes | 2457 words | Talha Awan

This is part 2 on the topic of Expressjs controller unit testing. Previously, I added unit tests for 5 basic CRUD APIs for vehicle. In this post I will show one more example, where controller logic gets a little longer.

[Read More]

nodejs expressjs mongoose api unit-testing

Unit Testing Expressjs Controller (Part 1)

Stepwise Test Driven Development of Express Mongoose CRUD APIs

Last Updated July 23, 2021 | 9 minutes | 1885 words | Talha Awan

So far, I have not found a real workable example of unit testing Express controller/route for API. Most I saw either label integration test as unit test or offer little meaningful in right direction.

[Read More]

nodejs expressjs mongoose api unit-testing

Node Express Endpoint to Upload and Process CSV File

Last Updated December 26, 2021 | 5 minutes | 923 words | Talha Awan

It is quite common in Node Express backend development to come across a requirement of parsing and processing CSV files. Usually, it is to store the content in the database after processing. In this post, we will upload a CSV file, store it temporarily in the server directory to fetch all rows in JSON form, push all rows in an array, and remove the temporary file. [Read More]

nodejs expressjs csv