how to create json variable in javascript code example

Example 1: json example

{ "name":"John", "age":30, "car":null }

Example 2: js create json from object

JSON.stringify(the_data);

Example 3: set variable with json javascript

var sammy = {
  "first_name"  :  "Sammy",
  "last_name"   :  "Shark",
  "online"      :  true
}
sammy.first_name --> "Sammy"
sammy.last_name  --> "Shark"
sammy.online     -->  true

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