Set and Get Custom Response Header values using Angular 5 and Express.js – Node.JS

While working with Node.js and Angular, sometimes you might need to set some custom values in Response Header from the server-side and get these values in your Angular application. These values can be some tokens, keys or anything. This article is about completing this requirement. Server-side using Express.js and Node.js To set a custom value in the response header, you have to write the following code in your Express.JS server

Even if you set this token in the response header, to get this in your Angular application you need to allow these header values. The allowed default header values are Cache-Control Content-Language Content-Type Expires Last-Modified Pragma To allow your custom header value, you need to use the Cors module of Node.JS. To install the Cors module, use the following command.

Now the code to allow the customer header values with Cors module use the following code

Accessing the header values in your Angular 5 application   To get the header value in the application, you need to access the whole response object. For this, you need to add on observe: “response”  to the request options in the following way

When subscribing to the observable, you can get the…

Write Cloud Functions on Cloud Firestore and deploy – Introduction
databases , firestore , Node.js / May 16, 2019

Contents > What is Cloud Firestore >What are Cloud functions >Writing and Deploying Cloud Functions to write data to Cloud Firestore Collection What is Cloud Firestore It’s a NoSQL document database that lets you store data for your Mobile Application, web Application, APIs… It is Cloud-based, highly scalable and flexible. To see your Firestore database dashboard visit the below URL Firestore has the following Datatypes string number boolean map array null timestamp geopoint reference Firestore is a Document database.We can save data as collections -> documents  ->  subcollections in a nested structure. Here we can see that the created date is a timestamp ,reciever_data is a map and reciever_id is a string data. What are Cloud functions Cloud Functions help to achieve serverless execution by providing access to Firebase and Cloud events .Operations can be done in response to these events. For example, you can do CRUD operations on the Firestore / Realtime database using Cloud Functions. You can deploy the Cloud function and hit them to perform these CRUD operations. The event handler for an HTTP request to the Cloud Functions listens for the onRequest event Writing and Deploying Cloud Functions to add data to Cloud Firestore Collection step 1…

Using express-validator to validate password to have minimum 8 characters including at least one special character and at least one number

Q How to use express-validator to validate passwords to have minimum 8 characters including at least one special character at least one number? A The regular expression used to validate a password which will follow the above-mentioned pattern is as follows

While using express-validator, we use  the chain method .matches() to check the input password against regular expression as follows

The above validator checks whether the request body of the post request has a password which is a minimum of 8 characters long, and contains an alphabet and a special character.   If there are any validation errors, it can be obtained using  validationResult(req)  

To display only the first error at a time we add the following object to errors.array() 

Now handling the error part looks like this

So the final code looks like this


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