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js-promisify
Advanced tools
A simple utility to convert NodeJS async functions to native JS promises.
JS Promisify is a npm minimal and well-tested async module for NodeJS, that converts NodeJS async style functions to native JS promises (if they're supported by the underlying JavaScript engine, like in Node >= 4.0.0).
For example, it can be used to convert the NodeJS native file system library (fs
), to easily perform file operations with promises.
npm install js-promisify
(add "--save" if you want the module to be automatically added to your project's "package.json" dependencies)
promisify(fun, args, [ctx])
fun
can be any function with a callback argument that follows the Node JS async function pattern signature (i.e. the callback is the last argument and has a signature function(err, data)
).args
is an array containing all the arguments that need to be passed to fun
, excluding the callback.ctx
(optional) is what the variable this
should be bound to when fun
is called with the arguments provided through the args
array.const promisify = require('js-promisify');
const fs = require('fs');
promisify(fs.readFile, ['path/to/myfile.txt', {encoding: 'utf8'}])
.then(function (data) {
console.log(data);
})
.catch(function (err) {
console.log(err);
})
// Same as above, using async / await
(async () => {
console.log(await promisify(fs.readFile, ['path/to/myfile.txt', {encoding: 'utf8'}]))
})()
MIT License
FAQs
A simple utility to convert NodeJS async functions to native JS promises.
The npm package js-promisify receives a total of 1,382 weekly downloads. As such, js-promisify popularity was classified as popular.
We found that js-promisify demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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