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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

By : Ray Rischpater
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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

1 (2)
By: Ray Rischpater

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

Using JSONPath bracket-notation to query JSON documents


JSONPath provides an alternate notation, bracket-notation, which works just like dot-notation to query fields. The syntax is reminiscent of how you access fields in associative arrays, where you pass the field name as the selector to operator[] to obtain the value in the named field.

How to do it…

In bracket notation, we will write the previous recipe's example as follows:

$['store']['book'][0].['title']
$['store']['book'][*].['title']
$['store']..['price']
$..['book'][3]

How it works…

As seen earlier, the first example extracts the title of the first book in the object in the field named store. The second example extracts all titles of all books in the store. The third example returns a collection of all price fields for every item in the store, and the fourth example returns the fourth book in the store.

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