how to convert a text into object havascript code example

Example 1: convert string to object javascript

var mystr = '{ "hello":"world" }' // NB: Has enclosing ""
var myobj = JSON.parse(mystr);

Example 2: convert json to object

Jackson Data-bind depdendency that take care of 
Converting between 
JSON to Java Object 
and 
Java Object to JSON

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.0</version>
</dependency>