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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

By : Ray Rischpater, Brian Ritchie
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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

1 (2)
By: Ray Rischpater, Brian Ritchie

Overview of this book

If you're writing applications that move structured data from one place to another, this book is for you. This is especially true if you've been using XML to do the job because it's entirely possible that you could do much of the same work with less code and less data overhead in JSON. While the book's chapters make some distinction between the client and server sides of an application, it doesn't matter if you're a frontend, backend, or full-stack developer. The principles behind using JSON apply to both the client and the server, and in fact, developers who understand both sides of the equation generally craft the best applications.
Table of Contents (12 chapters)
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11
Index

Encoding binary data as a base64 string using Node.js


If you have binary data that you need to encode to pass to the client as JSON, you can convert it to base64, a common means on the Internet to represent eight-bit values in solely printable characters. Node.js provides the Buffer object and a base64 encoder and decoder for this task.

How to do it…

First, you'll allocate a buffer, and then you'll convert it to a string, indicating that the string you want should be base64-encoded, like this:

var buffer = newBuffer('Hello world');
var string = buffer.toString('base64');

How it works…

The Node.js Buffer class wraps a collection of octets outside the Node.js V8 runtime heap. It's used in Node.js anytime you need to work with purely binary data. The first line of our example makes a buffer, populating it with the string Hello world.

The Buffer class includes the toString method, which takes a single argument, the means to encode the buffer. Here, we're passing base64, indicating that we want s to...

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