End-to-End TypeScript Type Safety With a Headless CMS

Your Next.js component expects a blog post with an author field that contains a name string. Your CMS response actually returns author as a reference ID, not an expanded object. At runtime, your component fails silently and the author name renders as undefined. A fully typed CMS client would have caught this at compile time — before the code shipped.

The Type Coverage Gap

Most teams using a headless CMS have one of two problems. Either they write API response types by hand — which drift from the actual schema as fields are added and renamed — or they use any and lose type safety entirely on CMS data. Both approaches mean TypeScript can't protect you from the most common source of runtime bugs in a headless frontend: unexpected or missing fields in API responses.

How ContentGrid Generates Types

ContentGrid's TypeScript SDK includes a type generation command that reads your schema from the API and produces TypeScript interfaces for every content type. Run it as part of your build or in a pre-commit hook:

• Every content type becomes a TypeScript interface with correctly typed fields
• Reference fields are typed as the linked content type, not as a generic object
• Optional fields are typed as T | undefined, forcing you to handle the null case explicitly
• Localised fields are typed with a locale map, so you access entry.title.en not entry.title
• Rich text fields have a typed document node structure, so your renderer can be fully type-checked

Using Generated Types in Next.js

Import the generated types in your server components or getStaticProps functions. The ContentGrid client returns typed responses automatically — no casting required. If you rename a field in ContentGrid's schema editor, regenerate the types, and TypeScript immediately flags every component that used the old field name. The compile error tells you exactly what to update.

For GraphQL queries, pair ContentGrid's schema with GraphQL Code Generator. Your .graphql query files generate typed hooks or query functions. Every field you request in a query is typed in the result; any field you didn't request is absent from the type, which prevents you from accidentally rendering undefined.

End-to-End Coverage in Practice

With generated types in place, the chain is fully covered: your ContentGrid schema defines the structure, the SDK generates TypeScript interfaces from that schema, your Next.js components use those interfaces, and your CI build catches any mismatch before deployment. A content model change that breaks a frontend component surfaces as a TypeScript error in your PR, not as a bug report from a user. That's the end-to-end type safety worth investing in.