Typing your content with schemas
A typo in a date should stop the build, with the file and the line, before it reaches readers.
By Kerem Aydın
1 min read
Frontmatter is a tiny database that nobody validates. A missing title, a date written as 10/08, a tag list that turned into a string: each one quietly ships.
A schema per collection
Describe the fields once, next to the collection, and let the build read every file through it.
const posts = z.object({
title: z.string(),
date: z.coerce.date(),
tags: z.array(z.string()).default([]),
});The same schema gives the editor its form and the layouts their types. A field that does not exist is a type error in the template, not a blank space on the page.
Errors that point somewhere
An error message is a user interface. "Invalid input" helps nobody; content/posts/hello.md:3: date: Invalid date sends you straight to the line.
