We'll see how data validation works in Node before implementing it in Express.

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Data validation is crucial in both frontend and backend applications to ensure data correctness, consistency, and security. This tutorial focuses on implementing data validation in Node.js using the express-validator library. It covers the importance and benefits of validating incoming requests, explains validation chains and schema-based validation, and provides sample code for validating route parameters, query parameters, and body data in an Express application.

How to Perform Data Validation in Node.js

Main Benefits of Validating Incoming Requests in Node.js

Data Validation in Node.js With Validation Chains

Data Validation in Node.js with Schema Validation

Wrapping Up: Protect Your Node.js Server From Unexpected Incoming Data

There are a lot of really powerfull validation libraries with good typescript support now. We extensively use them for configuration for example and here is the article about that <a href="https://dev.to/mrspartak/mastering-web-app-configurations-without-losing-your-mind-54ha" target="_blank" rel="noopener nofollow">https://dev.to/mrspartak/mastering-web-app-configurations-without-losing-your-mind-54ha</a>

There are a lot of libraries here like - express-validator, zod, VineJS, Joi etc. Which one is best to use for specific case and what are the differences between them are important.

I would recommend using Ajv for most use cases (even for an integration with expressJS), as it’s by far the most complete and performant JSON parser/validator on the market.