zig fmt: Format Your Code
Keep code tidy with the built-in formatter.
zig fmt: Format Your Code is a free Zig Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Zig Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
One Canonical Style
Zig ships a built-in formatter so every project looks the same. The command zig fmt rewrites your code into the canonical Zig style.
Format a File in Place
Point zig fmt at a file and it reformats that file directly on disk, fixing indentation, spacing, and line breaks for you.
zig fmt main.zigFormat a Whole Directory
Give it a directory and zig fmt walks it recursively, tidying every .zig file it finds. One command formats an entire project.
zig fmt src/No Configuration Needed
There are no style options to argue about. Zig fmt has one fixed style, which ends formatting debates across every team and codebase.
Check Without Changing
The --check flag reports files that are not formatted and exits with an error, but it never edits anything. Perfect for verification.
zig fmt --check src/Great for CI
Because --check returns a failing exit code, you can wire it into continuous integration to reject any unformatted code automatically.
Read from Standard Input
Pass --stdin and zig fmt formats text piped in and prints the result out. Editors use this to format on save.
cat main.zig | zig fmt --stdinEditor Integration
Most editors run zig fmt automatically when you save. Your code snaps into shape instantly, so you never think about layout again.
Formatting Is Not Linting
Remember the scope: zig fmt fixes layout only. It will not rename things or catch logic bugs; that is the compiler's job.
It Respects Some Choices
zig fmt mostly leaves your line breaks in literals and comments alone, so it cleans structure without erasing intentional layout.
A Healthy Habit
Run the formatter before every commit. Clean, consistent diffs make reviews faster and keep the whole history readable for everyone.
Quick Check
In CI you want to fail the build when code is not formatted, without modifying any files. Which command works?
Recap
You met zig fmt: one canonical style, format files or folders, --check for CI, and editor-on-save to keep code clean effortlessly. 🧹
Frequently asked questions
Is the “zig fmt: Format Your Code” lesson free?
Yes — the full text of “zig fmt: Format Your Code” is free to read here on the web, and the Zig Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Zig Academy course, upgrade to CoddyKit PRO.
What will I learn in “zig fmt: Format Your Code”?
Keep code tidy with the built-in formatter. You practise Zig Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Zig Academy?
No prior experience is required. Zig Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “zig fmt: Format Your Code” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Zig Academy lesson?
Yes. Every Zig Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- zig run vs zig build-exe
- Debug, ReleaseSafe, ReleaseFast
- Reading Compiler Errors
- zig fmt: Format Your Code