express-validator

In the world of running a public-facing server, it’s crucial to never trust the input you receive. Even though you may have implemented client-side code to sanitize and block any weird input, there are still ways for people to manipulate and exploit your server. That’s why it’s important to sanitize your input. Luckily, the express-validator package that you already use for input validation can also be used for sanitization. Let’s say you have a POST endpoint that accepts parameters like name, email, and age:...

In this blog post, we will learn how to validate input data in your Express endpoints using the express-validator package. Specifically, we will look at how to validate the name, email, and age parameters in a POST endpoint. Let’s start by setting up our Express server and configuring it to parse incoming JSON data: const express = require('express'); const { check, validationResult } = require('express-validator'); const app = express(); app.use(express.json()); Next, let’s define our POST endpoint and perform validation on the input data:...