Learn HOW TO PARSE JSON IN JAVA: A Quick Guide

When you want to know how to parse JSON in Java, there are so many different libraries to select from. What are the different solutions? Show me a quick example with code samples and what are the application security issues I should be aware of for parsing JSON?

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Chapters

00:00 Introduction
00:25 Overview of video
01:39 What is JSON
02:57 JSON Example
03:28 Picking a parsing library
04:46 Code the solution
07:39 Adding the library to Maven pom
11:03 Discussion of application security

So the question we address in this video is: How can we parse JSON in Java.

This is a great question and we could spend hours discussing the nuances of this topic.

In this video, we’ll present a JSON file or document, discuss the format and pull out some the data elements in an example Java application

First, let’s talk about JSON.

What is it?

JSON stands for Javascript Object Notation

it’s a language independent data format that we can use to express objects as a human readable list of properties

The data format represents an object as a curly brace delimited set, with a comma separated list of properties in between to represent the properties and state of the object

For each property, the name is expressed as a double quoted string

The property string name is followed by a colon character which is followed by the value of the property which is in one of the allowed JSON types

The supported types are number, string, Boolean, array, object and null

Numbers are unadorned by any punctuation such as double quotes, so you will see a number by itself

A string will be surrounded by double quotes

A boolean will be either true or false

Null will be the word null

An opening and closing set of curly braces represents a JSON object

And finally an array is represented by an opening and closing set of square brackets

Of course an object or array can be nested and contain additional objects and arrays so a JSON object can be quite complex

Let’s take a look at a short example JSON object.

A few things to note about this object

First you’ll see it is an anonymous object meaning it does not have a name in double quotes followed by a colon before the opening curly brace

The overall object has 4 properties.

They include 2 strings: firstname and lastname

Age which is a number

And another object called address

Notice address is not an anonymous object since it has a name, a colon and then a set of curly braces

Within the address object, we see 4 properties.

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