Express' error handling middleware is a powerful tool for consolidating your HTTP error response logic. Odds are, if you've written Express code you've written code that looks like what you see below.
This article originally appeared on LunchBadger. LunchBadger helps you build APIs in a continuous lifecycle using serverless open source.
In 2015, I started working on a new ODM for MongoDB and Node.js. It was based on the now-obsolete
Object.observe() function, and I unfortunately had to scrap the whole project when the
Object.observe() proposal was unexpectedly withdrawn. A lot of the core logic from the original ODM lives on in Archetype. But my brief time in Redux land and studying falcor taught me a crucial lesson: the Model-View-Controller paradigm is not the only way to do things. MVC and ODMs still make sense, but we can build a stronger, more functional abstraction as the basis for a more concise architecture. The new monogram has now been powering 100% of Booster's API queries for weeks and it's officially production ready. Here's what monogram is all about.
Mongoose 4.11 introduced an important new option to work around a major deprecation. The
useMongoClient option is the source of the '
open() is deprecated in mongoose' deprecation warning that has caused so much discussion. This option opts you in to using Mongoose 4.11's simplified initial connection logic and allows you to avoid getting a deprecation warning from the underyling MongoDB driver.
Mongoose 4.11 was released last week and includes several neat new features. It also has one very important deprecation, so before you upgrade please read about the
useMongoClient option in the docs. I'll write more about
useMongoClient and why it is necessary another time. But first, mongoose 4.11 enables a new plugin, mongoose-lean-virtuals, which lets you apply virtuals to query results even if you use the
lean() function. This plugin is a more general version of mongoose-lean-id.
You might remember locking from your undergrad systems programming class. Locks help when multiple threads that can be interrupted at any time access a shared resource. In distributed programming (like building a Node.js server that talks to a database) you have a similar problem: parallel operations can mutate documents in the database in conflicting ways. In particular, enforcing uniqueness, such as making sure only one user has a given email, is tricky.