Javascript promise returns unexpected token error

Question

Hi am trying to use request module with promise in nodeJS.

Here is my Script

require('promise'); var request = require('request'); const requestget = function (url) { return new Promise((resolve, reject) { request(url, function (error, response, body) { if (!error && response.statusCode == 200) { resolve(body); } else { reject(error); } }); }); } requestget('http://www.modulus.io').then(console.log);

but am getting the following error.

/home/xyz/reques.js:14 return new Promise((resolve, reject) { ^ SyntaxError: Unexpected token { at Module._compile (module.js:439:25) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Function.Module.runMain (module.js:497:10) at startup (node.js:119:16) at node.js:906:3

I really don't know what's wrong in this script any one can help me out.

choose between function (resolve, reject) { or (resolve, reject) => { — Jaromanda X
– Jaromanda X, Commented Mar 29, 2017 at 6:01
This worked for me. Thanks. I was using a very early version of Node. Arrow functions landed in version ~8. — PiggyMacPigPig
– PiggyMacPigPig, Commented Mar 27, 2018 at 16:00

meyer9 · Accepted Answer · 2017-03-29 05:59:27Z

5

On this line, you need to make sure you are defining a function. You can do this using arrow functions like so:

return new Promise((resolve, reject) => {

Arrow functions have the syntax (param1, param2) => {function body}, which is the same thing as saying function(param1, param2) {function body}. You can read more about them here.

answered Mar 29, 2017 at 5:59

meyer9

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4 Comments

sakthivel Over a year ago

Hi tried the same but am getting error like this. '. /home/xyz/reques.js:5 return new Promise((resolve, reject) => { ^ SyntaxError: Unexpected token >'

meyer9 Over a year ago

try using return new Promise(function(resolve, reject) { instead then. you could also run node with node --harmony if you want the latest features like arrow functions as they are now the recommended way of doing this (to preserve scope)

sakthivel Over a year ago

thanks it works like charm return new Promise(function(resolve, reject) still I don't know why => function not working

meyer9 Over a year ago

you're using an older version of node. You can make it work if you run it with node --harmony.

aaronw · Accepted Answer · 2017-03-29 06:01:22Z

You are trying to use arrow functions without arrows.

require('promise'); var request = require('request'); const requestget = function (url) { //Add the arrow on the below line return new Promise((resolve, reject) => { request(url, function (error, response, body) { if (!error && response.statusCode == 200) { resolve(body); } else { reject(error); } }); }); } requestget('http://www.modulus.io').then(console.log);

still am getting the following error: /home/xyz/reques.js:5 return new Promise((resolve, reject) => { ^ SyntaxError: Unexpected token > at Module._compile (module.js:439:25) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Function.Module.runMain (module.js:497:10) at startup (node.js:119:16) at node.js:906:3
You may have an older version of node, upgrade to anything past node v6 and you will have full support. If that's not an option just use new Promise(function(resolve, reject) { //Code here });

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