Question

How to get the first key of an object in TypeScript

Answer 1

let person = {
    id: 838209872,
    name: "John",
    age: 46,
    city: "New York"
};
 
const firstKey: string = Object.keys(person)[0];
 
console.log(firstKey); 
 
  
     
/*
run:
 
"id" 
 
*/ 
 

 

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Answer 2

// Defining an interface to specify the structure of the object.
interface Person {
    id: number;
    name: string;
    age: number;
    city: string;
}

let person: Person = {
    id: 838209872,
    name: "John",
    age: 46,
    city: "New York"
};

const firstKey: string = Object.keys(person)[0];

console.log(firstKey);

   
     
/*
run:
 
"id" 
 
*/ 
 

 

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