JavaScript reference

Promise.resolve

Creates a promise that is already fulfilled with a value.

Available since: ES2015

Syntax

Promise.resolve(value)

Parameters

Parameter	Type	Description
value	any	The value the promise is fulfilled with.

Return value

PromiseAn already fulfilled promise.

Examples

A ready promise:

const promise = Promise.resolve('cached data');
 
console.log(await promise);

Output:

cached data

A function that always returns a promise:

const cache = new Map([['anna', { name: 'Anna' }]]);
 
function getUser(id) {
  if (cache.has(id)) return Promise.resolve(cache.get(id));
  return new Promise((resolve) => setTimeout(() => resolve({ name: 'Loaded' }), 50));
}
 
console.log((await getUser('anna')).name);
console.log((await getUser('oleg')).name);

Output:

Anna
Loaded

Notes

If you pass a promise it is returned as is. Inside an async function Promise.resolve is unnecessary: any returned value is wrapped in a promise anyway.

In the tutorial

Promises — Promises in JavaScript: promise states, then, catch, finally, creating a promise with new Promise, and chains.

Thanks for reading!