How To Make Your Code Prettier. Without formatting your code manually | by Marcin | Aug, 2022

Without formatting your code manually

Illustration by the author

When you are new to programming, you’re focused on making your code work — not on making it look pretty. If you pay close attention to other people’s code, such as open source projects and example snippets in books or blogs, you will notice a few things:

  • the lines are indented
  • spaces and new lines are used consistently
  • lines are wrapped if they exceed some threshold

Many projects even have formal style guides explaining how those things should be done in the project.

Let’s see how to make your code up to the online beauty standards!

Great question! Aren’t we writing code for machines, and they don’t care about the looks? Yeah, machines don’t care, but code is consumed by humans a lot too — and for them, those small details can make a big difference.

If you spend five hours per day reading code, you want the experience to be as frictionless as possible. Unexpected styling choices call attention to things that don’t matter, disturbing the reader for no reason. Some programming languages — such as Python — made indentation a meaningful part of the language syntax to enforce reasonable indentation. A similar approach was brought to the JS world with CoffeeScript. At one point, a pretty popular language was compiled to JS.

It’s so painful to review branches that combine:

  • meaningful code changes
  • meaningless style changes

Just take a look at the screenshot from GitHub Pull Requests:

showing one changed file with 0 additions and one 1 deletion


showing one changed file with 16 additions and 19 deletions.

In both cases, the meaningful part of the change is the same: I removed sourceMap: true.

Finding what changed can be difficult in a noisy diff, let alone evaluating its impact. Imagine reviewing such a change in a file that is 1,000 lines instead of 10.

Luckily, we don’t have to study the style guides anymore; we have tools that apply them automatically to our code base. Many of those tools are opinionated. They leave very limited configuration options, so you have to accept the opinions of their authors.

Prettier is a frontend-oriented code formatter. It supports the following:

  • code: JS, TS, JSX
  • styles: CSS, Less, SCSS
  • views: HTML, Vue, Ember and Angular templates, Markdown
  • configuration files: JSON, YAML

And some more with plugins.

Prettier is committed to ending the style guide debates. Therefore, the configuration options are limited. There are a few things you can tweak, but by using Prettier, you mostly outsource the style guide decisions to its author.

Prettier is widespread in the JS community. It’s used by core teams of React, Vue, and Angular. Styling your project with it will make your code look like everybody else’s, which is a good thing as it keeps consistency across many projects people work on.

This is a similar application but for Python code. I used it a few times while helping out with a Python project. I was pleased to have a tool that maintains the formatting for me. I had no interest in learning much Python, but I cared about the consistency enough to make sure my changes were in line with the code style guide the project uses. Thanks to Black, I kept my code neat without thinking twice about what the conventions were in the Python community.

I don’t know similar tools in other languages, but I would follow these guidelines if I were looking for some tool:

  1. Independent of the text editor. Usually, an integrated development environment (IDE) can style your code, but not many developers would accept switching their favorite to use the same styling tool. Without everybody using the same tool, there will be styling noise in the code changes — something we want to avoid.
  2. Command line interface (CLI), so you can easily integrate it with your text editor of choice, git commit hooks, or continuous integration (CI).
  3. Opinionated. There are so many better things to do than debate code style. Most developers are lazy enough to give up their style preference for automated styling.

What tools do you use for formatting your code in JavaScript or other languages?

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