How to add,modify or remove attribute from a json string?

JavaScript
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how to add,modify or remove attribute from a json string?

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Do you mean Java Script Object Notation? Visit json.org for more

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Suppose if you have a JSON object as

a = { 'A' : 1, 'B': 2 };

To delete the key ‘A’, use:

delete a.A;
//For testing:
console.log( a );