Middleware refers to functions or modules between a request and response cycle, which can be broadly classified into three types: request, response, and error middlewares. The Node.js request processing pipeline is a sequential process where each middleware function executes in a specific order. Best practices for implementing middleware include keeping it lightweight, using async/await syntax, and complying with security best practices.
Mastering the art of testing asynchronous code is crucial for fullstack developers, as it's an essential part of modern web development. However, testing async code can be daunting due to challenges like timing issues, callback hell, and promise purgatory.
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