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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 the JSONPath dot-notation to query JSON documents


JSONPath uses expressions written in either the dot-notation or bracket-notation to denote a traversal of fields in the JSON document. Dots separate field names, as if they were object attributes.

How to do it…

Here are a few examples of dot-notation:

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

How it works…

In the first line, we reference the first (counting from zero) book in the store, returning the title field. The second line is similar, except that it returns a collection of all titles of all the books. The third example returns a collection of all price fields in all records in the store collection. The fourth example finds the fourth book item in the store.

The notation is fairly intuitive, except for the use of .. and *. These are examples of some of the special characters used by JSONPath to denote slices across the document.

There's more…

JSONPath defines the following special characters you can use when...

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