--- title: "#191: Dr. Axel Takes a Look at Node 8's util.promisify()" publication: "Node Weekly" issue: 191 published_at: "2017-06-08" canonical_url: "https://nodeweekly.com/issues/191" --- #191: Dr. Axel Takes a Look at Node 8's util.promisify() This week's Node news[Read this e-mail on the Web](http://nodeweekly.com/issues/191) Node WeeklyJune 8, 2017 #191 Hacker Noon [From Node 6 to Node 8: A Real-World Performance Comparison](https://hackernoon.com/upgrading-from-node-6-to-node-8-a-real-world-performance-comparison-3dfe1fbc92a3)David Gilbertson details how the switch to Node 8 resulted in shaving a quarter off server-rendering time and a third off npm install time on his app. Dr. Axel Rauschmayer [A Look at Node 8's util.promisify()](http://2ality.com/2017/05/util-promisify.html)`util.promisify` converts a callback-based function to a Promise-based one. Dr. Axel shows off how to use it. Node.js Foundation [Node 8.1 Released: A Minor Bugfix and Upgrade Release](https://nodejs.org/en/blog/release/v8.1.0/)npm upgraded to 5.0.3, libuv to 1.12.0. `fs.exists()` now works properly with `util.promisify()` and more. RedisgreenSponsor [Highly available, scalable Redis](http://www.redisgreen.net/?utm_source=nodeweekly&utm_medium=email&utm_campaign=2017b&utm_content=primary&utm_term=ha+scalable)See inside your database with large key detection, memory mapping, auto-scaling and more from RedisGreen [![Redisgreen\](https://copm.s3.amazonaws.com/346dd844.png)](http://www.redisgreen.net/?utm_source=nodeweekly&utm_medium=email&utm_campaign=2017b&utm_content=primary&utm_term=ha+scalable) Trevor D. Miller [Running a Node Server on a Raspberry Pi with a Physical Button](https://trevordmiller.com/blog/raspberry-pi-button)Wiring up a physical button to a Pi using the latest versions of Node and npm, and creating a Node server to send a text message when the button is pressed. Tamas Kadlecsik [An Example of Handling 100GB+ of Data with Node and MySQL](https://blog.risingstack.com/node-js-mysql-example-handling-hundred-gigabytes-of-data/)RisingStack uses MySQL to store data for its _Trace_ monitoring tool. Here they show how MySQL’s table partitioning helps keep things scaling and using [knex](http://knexjs.org/) to do things from Node. The npm Blog [npm 5.0.2 Released: Git Fixes and a New 'Canary' Release](http://blog.npmjs.org/post/161370331310/v502-2017-06-02)Happy to be a little closer to the edge with npm releases? `npm i -g npmc` will get you a ‘canary’ release as a separate `npm` binary. Peter Dierx [A Beginner's Guide to npm, the Node Package Manager](http://www.sitepoint.com/beginners-guide-node-package-manager/)A popular introductory guide (or refresher) has been updated for npm 5.0’s recent release. In Brief - [PSA: npm‑cdn.com and npm‑js.com Are Not Related to npm, Inc.](http://blog.npmjs.org/post/161325296275/statement-on-npmcdncom-and-npmjscom) news Isaac Z. Schlueter - [Node v6.11.0 (LTS) Released](https://nodejs.org/en/blog/release/v6.11.0/) news Node.js Foundation - [Announcing TypeScript Support in Electron](https://electron.atom.io/blog/2017/06/01/typescript) news Zeke Sikelianos - [N-API: Next Generation Node APIs for Native Modules](https://medium.com/the-node-js-collection/n-api-next-generation-node-js-apis-for-native-modules-169af5235b06) news Node.js Foundation - [StdLib Now Supports Node 8.0.0 Natively](https://medium.com/stdlibhq/stdlib-updates-node-8-0-0-platform-support-new-faaslang-function-definitions-b33ffe5633b8) news Stdlib is an infinitely scalable, self-healing web services platform. Keith Horwood - [Get started with MongoDB and Node.js](https://resources.mongodb.com/node-js?jmp=cpress&utm_campaign=WW_CP_newsletter_sponsorship_FY17Q2&utm_content=sponsored%20&utm_medium=display&utm_source=nodeweekly0608) tutorial We put together a hub of resources that will help you build an app using MongoDB and Node.js. Check it out today. Mongo DBSponsor - [Using util.promisify() in Node 8](http://farzicoder.com/util-promisify-in-Node-js-v8/) tutorial Suyash Mohan - [Sending 10,000 Calls to Congress with Node.js and Twilio](https://www.twilio.com/blog/2017/05/calls-congress-node-js-twilio.html) tutorial A user calls a number and a Node script routes that to the caller’s local representative. Ian Webster - [MongoDB Connection Pooling for Express Apps](https://blog.mlab.com/2017/05/mongodb-connection-pooling-for-express-applications/) tutorial mLab - [First Steps to Building an API with Koa.js](https://www.dailydrip.com/blog/build-an-api-with-koa-js) tutorial Using Koa, a minimalist web framework (similar to Express). Alex Allen - [Installing Node 8 on Linux with apt-get or yum](https://nodesource.com/blog/installing-node-js-8-tutorial-linux-via-package-manager) tutorial Tierney Cyren - [Integrating OpenWhisk with Your Node App](https://www.raymondcamden.com/2017/06/02/integrating-openwhisk-with-your-node-application/) tutorial OpenWhisk is a serverless event-based programming service from IBM. Raymond Camden - [Understanding Lock Files in npm 5](http://jpospisil.com/2017/06/02/understanding-lock-files-in-npm-5.html) tutorial Jiří Pospíšil - [Writing a Chess Microservice using Node](https://medium.freecodecamp.com/follow-the-rules-with-seneca-b3cf3d08fe5d) tutorial Using the Seneca framework, a toolkit for Node, to break down the rules of chess into a microservice. Jeff Lowery - [Integrating Node Build Tools with Maven](https://auth0.com/blog/integrating-node-dot-js-build-tools-with-maven/) tutorial Maven is a build automation tool commonly used on Java projects. Bruno Krebs - [Try Codeship Basic: simple hosted CI that works out of the box](https://codeship.com/features/basic-aw?utm_source=email-sponsorship&utm_medium=cpc-node-weekly-secondary&utm_campaign=cooper-basic-features-signup-campaign) Get set up with our hosted Continuous Integration service in under 3 minutes. Join thousands of customers like InvisionApp & Whole Foods. 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