Node.js

With Jest it’s possible to assert of single or specific arguments/parameters of a mock function call with .toHaveBeenCalled/.toBeCalled and expect.anything(). The full example repository is at github.com/HugoDF/jest-specific-argument-assert, more specifically lines 17-66 ...

The why and how of enterprise-style Node.js application. A setup that’s easy to test and extend using battle-hardened technologies like Express.js, Postgres and Docker Compose to run locally. Dive into the code on GitHub directly: github.com/HugoDF/express-postgres-starter. ...

A solution to serve your Dockerized application on Docker Compose with TLS/SSL locally by leveraging a HTTPS reverse-proxy and mkcert. Examples with Caddy and nginx are at: github.com/HugoDF/docker-compose-local-https Table of contents: ...

Settling on a Netlify + Dokku on DigitalOcean (for US) or Hetzner Cloud (for EU) deployment stack for JavaScript and Node. Over the last few years I’ve never quite settled on a goto deployment strategy for my apps and projects. Technology-wise it has settled towards Vue or stat ...

This post goes through how to use Object.defineProperty to mock how constructors create methods, ie. non-enumerable properties that are functions. The gist of Object.defineProperty use with a function value boils down to: const obj = {} Object.defineProperty(obj, 'yes', { ...

To test an Express handler, it’s useful to know how to successfully mock/stub the request and response objects. The following examples will be written both using Jest and sinon (running in AVA). The rationale for this is the following. Jest is a very popular “all-in-one” testing ...

The config npm package is great (npmjs.com/package/config), but it encourages confusing and non-12-factor-app-compliant patterns. We’ll look at some of the patterns it encourages and why they’ll bring you struggles down the road as well a simple, single-file, no-dependency way to ...

A look at the history, patterns and gotchas of asynchronous operations in JavaScript. We’ll go through the pros and cons of callbacks, Promises and async/await. Present some pitfalls to bear in mind as well as introducing how you would deal with certain situations. Live-cod ...

DataTypes are core to the Sequelize 4 library. This is a practical and complete guide to make up for the sparse Sequelize official documentation on the subject. First of all, DataTypes contains both the types and generators for default values: eg. NOW, UUIDV1 and UUIDV4 are speci ...

If you want to ship, use the tools you know. — A lot of people Let’s apply that principle: I’m building Post Frequency/Accountable Blogging, I’m familiar with Vue and Node-based backends. Netlify makes frontend deployments trivial and I’ve settled on Dokku for ...