You can do something like this:
var students = [ { city: 'California', company: 'ABC'}, { city: 'LA', company: 'PQR'}, { city: 'Mumbai', company: 'XYZ'}];
students.forEach((obj) => {
obj['email']= '[email protected]';
console.log(obj);
});
// Final Output
console.log(students);
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solved How to add key value pair to the json?