Headless CMS is a term that has been on every developer’s lips for years. And despite the emergence of dozens of new solutions (Contentful, Sanity, Strapi, Payload), WordPress remains the most popular headless platform. Why?
What Is Headless WordPress
Classic WordPress = backend + frontend in one system (PHP + themes). Headless = backend only: the REST API or GraphQL (via WPGraphQL) returns JSON, and the frontend can be anything — Astro, Next.js, Nuxt, SvelteKit.
You get a familiar admin interface for clients, all the plugins for SEO, forms, and ACF, but the frontend is modern, fast, with Lighthouse 95+.
REST API vs WPGraphQL
REST API — built-in, no plugins required, easy to get started. Downside: over-fetching (you receive more data than needed).
WPGraphQL — precise queries, only the fields you need, subscriptions. But it requires setup and an additional plugin.
For smaller projects, the REST API is perfectly sufficient. For large sites with dozens of content types — GraphQL is justified.
Custom Post Types and ACF
The main strength of WordPress in headless is flexibility. Custom Post Types + Advanced Custom Fields let you build any content structure without writing a separate backend. Register fields via register_post_meta with show_in_rest: true and they’re immediately available in the API.
Advantages of Headless WordPress in 2026
- Clients already know WordPress — zero learning curve
- Thousands of plugins: SEO (Yoast/RankMath), forms, galleries
- Multilingual support via Polylang/WPML
- WordPress hosting is cheaper than cloud headless CMS
- Huge community and documentation
Are There Downsides?
Yes. Post previews require additional setup. Some plugins (page builders) aren’t compatible with headless. But for most projects, these limitations aren’t critical.
Conclusion
Headless WordPress is the pragmatic choice in 2026: familiar for clients, flexible for developers, fast on the frontend. Combine it with Astro or Next.js — and you get a modern stack without unnecessary complexity.