Question

How to lowercase all keys in an object with Node.js

Answer 1

function keysToLower(obj) {
    return Object.keys(obj).reduce((accumulator, key) => {
            accumulator[key.toLowerCase()] = obj[key];
            return accumulator;
    }, {});
}
 
let obj = {
    Q: 'NodeJS',
    LANG: 'en',
    LIMIT: 10
};
 
obj = keysToLower(obj); 
 
console.log(obj); 
   
 
 
   
/*
run:
   
{ q: 'NodeJS', lang: 'en', limit: 10 }
   
*/

 

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Answer 2

let obj = {
    Q: 'NodeJS',
    LANG: 'en',
    LIMIT: 10
};
 
obj = Object.fromEntries(Object.entries(obj).map(([key, value]) => [key.toLowerCase(), value]));
 
console.log(obj); 
   
 
 
   
/*
run:
   
{ q: 'NodeJS', lang: 'en', limit: 10 }
   
*/

 

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