The Promise.resolve(value) method returns a Promise object that is resolved with the given value. If the value is a thenable (i.e. has a "then" method), the returned promise will "follow" that thenable, adopting its eventual state; otherwise the returned promise will be fulfilled with the value.




Argument to be resolved by this Promise. Can also be a Promise or a thenable to resolve.

Return value

A Promise that is resolved with the given value.


The static Promise.resolve function returns a Promise that is resolved.


Using the static Promise.resolve method

Promise.resolve("Success").then(function(value) {
  console.log(value); // "Success"
}, function(value) {
  // not called

Resolving an array

var p = Promise.resolve([1,2,3]);
p.then(function(v) {
  console.log(v[0]); // 1

Resolving another Promise

var original = Promise.resolve(true);
var cast = Promise.resolve(original);
cast.then(function(v) {
  console.log(v); // true

Resolving thenables and throwing Errors

// Resolving a thenable object
var p1 = Promise.resolve({ 
  then: function(onFulfill, onReject) { onFulfill("fulfilled!"); }
console.log(p1 instanceof Promise) // true, object casted to a Promise

p1.then(function(v) {
    console.log(v); // "fulfilled!"
  }, function(e) {
    // not called

// Thenable throws before callback
// Promise rejects
var thenable = { then: function(resolve) {
  throw new TypeError("Throwing");

var p2 = Promise.resolve(thenable);
p2.then(function(v) {
  // not called
}, function(e) {
  console.log(e); // TypeError: Throwing

// Thenable throws after callback
// Promise resolves
var thenable = { then: function(resolve) {
  throw new TypeError("Throwing");

var p3 = Promise.resolve(thenable);
p3.then(function(v) {
  console.log(v); // "Resolving"
}, function(e) {
  // not called


Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Promise.resolve' in that specification.
Standard Initial definition in an ECMA standard.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Promise.resolve' in that specification.

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari Servo
Basic Support32.0(Yes)29.0No support197.1No support
Feature Android Chrome for Android Edge Mobile Firefox for Android IE Mobile Opera Mobile Safari Mobile
Basic Support4.4.432.0(Yes)29No support(Yes)8.0

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

ECMAScript6 JavaScript Method Promise