Headless CMS Explained: WordPress, Strapi, and When to Use Each

If you have been told your Next.js website “needs a headless CMS” but you are not entirely sure what that means or why it matters,  this post is for you. A headless CMS is a backend content management system that stores and manages your content, then delivers it via API to whatever frontend you choose. It is called “headless” because the presentation layer, the “head”, is removed. The CMS does not render pages. It provides content. Your frontend does the rendering. At Inity Agency, we use headless CMS as part of every custom web build, pairing Next.js with WordPress, Strapi, or other options depending on the project. Here is an honest breakdown of what headless means, when it matters, and how to choose.

What Is a Traditional CMS?

Before headless makes sense, it helps to understand what it replaced. A traditional (or “coupled”) CMS manages both the content and the presentation in a single system. WordPress in its classic form is the clearest example: you write a post, WordPress applies a theme, WordPress renders an HTML page, and that page is served to the user. The content and the design are tightly bound together.

This works well for most websites. It is why WordPress powers 43% of the web. But it creates constraints for modern product teams:

• The frontend is tied to the CMS’s rendering system, you cannot use a modern JavaScript framework like Next.js without working around the CMS architecture
• Content is stored in a format designed for web pages, not for delivery to a mobile app, a native application, or an AI interface
• Performance is server-side and plugin-dependent, every page load involves PHP execution and database queries
• Customising the data model requires plugins or core modifications, not a clean API contract

These constraints do not matter for a simple blog or marketing site. They matter significantly for a SaaS product, a multi-platform digital product, or a website that needs to share content with a mobile app.

What Is a Headless CMS?

A headless CMS does one job: store content and serve it via API. It has no opinion about how that content is displayed. It does not render pages. It does not generate HTML. It exposes structured content — posts, pages, products, categories, custom content types — as JSON via REST or GraphQL endpoints, and your frontend consumes that data and renders it however it chooses.

The “head” that is removed is the presentation layer. The CMS is purely a content repository and API layer.

What this enables:

• Your frontend can be built in any framework – Next.js, Nuxt, Astro, a React Native mobile app, or anything else that can make an HTTP request
• The same content can be delivered to multiple frontends simultaneously – your website, your mobile app, and a third-party integration all consume the same API
• Your frontend has complete control over performance – server-side rendering, static generation, edge caching, without any CMS constraint
• Content editors still get a familiar admin interface, they write content, upload images, manage pages, they just do not see or control how it is rendered

The separation of concerns is the core benefit. Content teams own content. Development teams own the frontend. The API is the contract between them.

WordPress as a Headless CMS

WordPress was not built as a headless CMS, but it has evolved to support the pattern effectively. Since WordPress 4.7, the REST API has been built into core, making every piece of WordPress content accessible as JSON without any plugins. The WPGraphQL plugin extends this further, providing a typed GraphQL endpoint that many development teams prefer for its flexibility.

How WordPress headless works: WordPress manages your content: posts, pages, custom post types, media, exactly as it always has. Editors log into the familiar WordPress admin, write content, and save. But instead of WordPress rendering a PHP template and serving HTML, your Next.js frontend fetches that content via the REST API or WPGraphQL and renders it on the frontend.

WordPress headless is a strong fit when:

• Your team or your client’s team already knows WordPress – editorial workflows, user roles, media management, plugin ecosystem
• Non-technical content editors need to manage the site independently after launch
• Your content model is relatively standard — pages, posts, categories, custom post types, without highly complex relational data requirements
• You want the breadth of the WordPress plugin ecosystem: Yoast SEO, ACF for custom fields, WooCommerce if e-commerce is needed
• Budget and timeline favour a familiar tool over a custom backend

WordPress headless limitations:

• WordPress was built monolithic, running it headless adds architectural complexity that is not native to its design
• Performance at scale requires more careful configuration than a purpose-built headless CMS
• The PHP codebase and plugin ecosystem introduce security surface area that a leaner Node.js backend avoids
• For highly custom content models with complex relational data, ACF (Advanced Custom Fields) works but is less elegant than defining a content schema from scratch in Strapi

Strapi as a Headless CMS

Strapi is an open-source, Node.js-based headless CMS built API-first from day one. There is no legacy frontend to strip away, Strapi was designed as a pure content backend and API layer. Developers define content types (collections, single types, components) through a visual interface or in code, and Strapi automatically generates REST and GraphQL endpoints for each content type.

How Strapi works: Strapi’s admin panel is for content modelling and content management, defining the structure of your data and filling it with content. Your frontend makes API calls to retrieve that content. Strapi can be self-hosted on your own infrastructure or deployed to Strapi Cloud. It supports PostgreSQL, MySQL, SQLite, and MongoDB.

Strapi is a strong fit when:

• You need custom content models with complex relationships – relational data, nested components, dynamic zones
• Your product delivers content to multiple frontends – a website and a mobile app consuming the same API
• Developer control over the API is important – custom controllers, custom endpoints, role-based access control defined in code
• Data sovereignty matters – regulated industries (HealthTech, FinTech) where self-hosting on your own infrastructure is a compliance requirement
• Your team is comfortable in Node.js and JavaScript, the Strapi codebase is familiar to any Next.js developer
• You are building a SaaS product where the CMS is part of the product backend, not just a content management layer

Strapi limitations:

• Higher initial setup cost than using WordPress headless – requires a developer to configure, host, and maintain
• Smaller community and ecosystem than WordPress – fewer off-the-shelf plugins and integrations
• Self-hosted Strapi requires infrastructure management – server costs, updates, backups, unless you opt for Strapi Cloud (paid)
• Not ideal for non-technical content editors managing complex workflows without developer support

WordPress Headless vs Strapi: Side-by-Side