Json

1. JSON Syntax Rules

JSON syntax is derived from JavaScript object notation syntax:

• Data is in name/value pairs

• Data is separated by commas

• Curly braces hold objects

• Square brackets hold arrays

The JSON format is almost identical to JavaScript objects.

In JSON, _keys _must be strings, written with double quotes:

In JavaScript, keys can be strings, numbers, or identifier names:

2. JSON values

in JSON, values must be one of the following data types:

1. a string

2. a number

3. an object(JSON object)

4. an array

5. a boolean

6. null

in JavaScript values can be all of the above, plus any other valid JavaScript expression, including:

1. a function

2. a date

3. undefined

3.Jackson(API) Jackson Library

Jackson is a high-performance JSON processor for Java. It provides many ways of working including simple POJO converted to/from JSON for simple cases. Jackson provides a set of annotations for mapping too.