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Pro Express.js: Master Express.js: The Node.js Framework For by Azat Mardan

By Azat Mardan

Professional Express.js is for the reader who desires to speedy get up-to-speed with Express.js, the versatile Node.js framework. writer Azat Mardan basically explains tips to commence constructing with Express.js with a easy 'Hello World', after which delves right into a deep API reference, earlier than universal and summary improvement difficulties. finally, you are going to how you can construct a chain of real-world apps so as to cement your wisdom. that allows you to get the simplest from this e-book, you can be accustomed to Node.js scripts and ready to set up programs utilizing npm. within the deep API reference, each one point of the Express.js API is defined essentially with an easy workout to illustrate its utilization. This contains configuration, settings and environments; diversified middleware and its makes use of; templating engines; extracting parameters and routing; request and reaction; errors dealing with; and working an app. within the subsequent half you are going to delve into abstraction, streams, authentication, multithreading, Socket.io, safety, and extra advanced modules. additionally, you will know about smaller frameworks outfitted utilizing Express.js, akin to Sails.js, and Derby. eventually you are going to construct real-world apps together with a leisure API, Todo App, and Instagram gallery.

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Js uses “weak” ETag. Other possible values are false (no ETag), true (weak ETag), and strong (strong ETag). info Chapter 3 ■ Configuration, Settings, and Environments If you’re not familiar with what weak or strong means, here’s the short explanation of the differences between these types of ETags: an identical strong ETag guarantees the response is byte-for-byte the same, while an identical weak ETag indicates that the response is semantically the same. So you’ll get different levels of caching with weak and strong ETags.

It’s a function that takes two arguments: key and value. If undefined is returned, then the value is omitted. For the key-value pair to make it to the final string, we need to return the value. js uses null as the default value for json replacer. stringify(obj, null, 2) when I need to print pretty JSON. The spaces parameter is in essence an indentation size. Its value defaults to 2 in development and to 0 in production. In most cases, we leave these settings alone. js, we have a /json route that sends us back an object with a book’s information.

Js. js settings. js positions itself as a configuration over convention framework. js, you can configure pretty much anything! To do so, you use configuration statements and know the settings. What are the settings? Think of settings as key-value pairs that typically act in a global or application-wide manner. Settings can augment behavior of the server, add information to responses, or be used for references later. js system settings that the framework uses behind the scene, and arbitrary settings that developers use for their own code.

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