Question

How to lowercase all keys in an object with TypeScript

Answer 1

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

 

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Answer 2

let obj = {
    Q: 'TypeScript',
    LANG: 'en',
    LIMIT: 10
};
 
obj = Object.fromEntries(Object.entries(obj).map(([key, value]) => [key.toLowerCase(), value]));

console.log(obj); 
   
 
 
   
/*
run:
   
{
  "q": "TypeScript",
  "lang": "en",
  "limit": 10
} 
   
*/

 

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