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Keeping a headless WordPress site current requires two separate mechanisms: an API that lets the frontend read content, and a change signal that tells its cache which data or pages to refresh. The WordPress REST API or WPGraphQL handles delivery; a webhook or equivalent event pipeline triggers targeted revalidation in the frontend.
When those jobs are designed together, a published post can update its detail page, archives, menus and related listings without rebuilding the entire site. When either job is missing, editors can see a successful publish in WordPress while visitors continue to receive an older cached response.
What “in sync” means in a headless WordPress architecture
In a traditional WordPress theme, publishing and rendering happen in the same application. A headless setup separates them. WordPress remains the editorial system and stores posts, pages, media, taxonomies and custom data. A separate frontend—often a JavaScript application rendered statically, on the server, or at the edge—fetches that data and maintains its own caches.
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- Can the frontend retrieve the current representation? It needs a supported API route, the right fields, and appropriate authentication.
- Does the frontend know when its cached representation is obsolete? It needs a notification and an invalidation policy.
An API request by itself does not invalidate a static page or a cached data request. Conversely, a webhook that fires without a reliable data fetch can trigger a rebuild that still stores incomplete or unauthorized content. Treat content access and freshness as separate contracts, then connect them with an observable event path.
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Choose how the frontend reads WordPress
WordPress REST API
The core REST API sends and receives JSON objects, as described in the WordPress REST API Handbook. Standard routes cover posts, pages, media, taxonomies and other resources. The exact namespaces, post types, fields and permissions depend on the individual site, so a client should discover the installation rather than assume that every WordPress site exposes the same routes.
Use the REST API discovery process and check the REST API reference for the routes and namespaces that the site advertises. A custom post type may be absent, read-only, or exposed under a name different from the one used in the WordPress editor.
WPGraphQL
WPGraphQL adds a GraphQL schema so the frontend can request a precise selection of fields and relationships. Its documentation explains the schema and extension model at WPGraphQL Docs. GraphQL can be a good fit when a page combines nested data—such as a post, its author, featured image, taxonomy terms and related content—in one query, but it requires the schema and any custom fields to be configured and maintained.
Decision matrix
| Consideration | REST API | WPGraphQL |
|---|---|---|
| Availability | Built into WordPress core; confirm routes and namespaces on the target site. | Requires the WPGraphQL plugin and any extensions needed by the schema. |
| Request model | Resource-oriented JSON endpoints; clients may make several requests for related data. | One query can select nested fields and relationships, subject to the schema. |
| Fields and content types | Depends on core, registered post types and REST exposure settings. | Depends on registered GraphQL types, field resolvers and extensions. |
| Authentication | Public resources are generally anonymous; private resources require authentication or explicit exposure. See REST API Authentication. | Use the authentication and preview approach supported by the GraphQL installation; do not expose private data in a public query. |
| Best starting point | A site that needs a standard, core-supported API with straightforward resource requests. | A site with complex relationships, a team comfortable with GraphQL, or extensions built around a GraphQL schema. |
| Performance claim | Neither approach is universally faster or easier. Measure the actual queries, caching and hosting setup. | |
Do not select an API solely because it is fashionable. Inventory the content types, fields, preview requirements, installed extensions and team skills first. The API choice also affects how you identify changed entities and how your cache layer can purge them.
Model cache dependencies before writing invalidation code
A changed article rarely affects only its own URL. A post may appear on a home page, a category archive, an author page, a search result, a “latest” feed, a navigation menu or a recommendation block. A taxonomy rename can affect every route that displays that term. A media replacement can affect a post, an image rendition and an image-heavy listing.
Create a dependency map that answers, for each WordPress entity, which frontend data and routes depend on it. Use stable identifiers rather than titles or slugs alone:
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- Entity tags: for example, a post ID tag, a taxonomy-term tag and a menu tag.
- Collection tags: tags for a post type, archive, feed or query shape.
- Route paths: the canonical URL and any known archive or landing pages that must be refreshed.
- Custom-data tags: identifiers for custom fields, tables or external records that the page reads.
Keep the mapping in one documented module or service. If a post is fetched by numeric ID in one component and by slug in another, associate both cache keys with the same content identity. Include locale, site section or tenant in a tag when those dimensions can produce different responses.
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Send a change signal from WordPress to the frontend
Use an event endpoint, not frontend polling alone
Polling WordPress on a fixed interval can eventually detect a change, but it leaves a predictable stale window and creates requests even when nothing changed. The WPGraphQL Smart Cache on-demand revalidation documentation describes an event-driven pattern: its graphql_purge action can drive a webhook that tells a frontend which pages to rebuild. Static frontends using incremental regeneration commonly use this kind of notification.
For a REST implementation, connect the WordPress publishing and content-management events available in your installation to a server-side endpoint. The event should identify the operation and the affected entities; it should not ask the public browser to perform the purge.
Define a small, explicit payload
An event payload should contain enough information for deterministic invalidation and logging. An illustrative shape is:
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{
"event": "post.updated",
"entity": "post",
"id": 842,
"slug": "example-slug",
"status": "publish",
"changed": ["title", "content", "featured_media"],
"tags": ["post:842", "archive:news"],
"paths": ["/news/example-slug"]
}The field names are an application contract, not a WordPress standard. Keep the contract versioned, reject unknown or malformed operations, and make processing idempotent so a retried notification produces the same result as the first one.
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Protect and validate the endpoint
- Accept requests only over HTTPS and authenticate the sender with a secret, signature or another mechanism appropriate to your deployment.
- Validate the event type, entity identifier, status, tags and paths against an allowlist. Never accept arbitrary cache keys from an unauthenticated caller.
- Limit request size and rate, and return a clear success or failure status so the sender can retry transient errors.
- Log a correlation ID, the received event, the invalidation result and any downstream error without logging credentials or private content.
- Keep the endpoint server-side. A browser-visible endpoint that can purge arbitrary paths is an application-state vulnerability.
The cited event documentation demonstrates the purge-and-webhook pattern but does not prescribe one universal authentication scheme. Choose controls that fit your hosting platform and threat model.
Apply the right revalidation strategy in the frontend
Time-based revalidation
Time-based revalidation refreshes data after a configured interval. It is simple and can provide a safety net when an event is delayed, but content may remain stale until the interval expires and a request causes the refresh. Use it when a bounded delay is acceptable or when a source cannot reliably emit events.
On-demand revalidation
On-demand revalidation runs because a change event arrived. It can make publishing appear quickly without rebuilding unrelated pages, but it depends on delivery, authentication, invalidation and the next data fetch all working correctly.
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Tags versus paths in Next.js
The current Next.js revalidation documentation describes invalidating cached data by tags or routes by path. It recommends tag-based invalidation when practical because a tag can represent a shared data dependency across many pages. Path invalidation is useful when the affected route is known and its cache association is not.
| Method | Use when | Important behavior |
|---|---|---|
| Tag invalidation | Several routes depend on the same post, taxonomy, menu or query result. | Invalidates data associated with the tag; choose tag granularity carefully to avoid refreshing too much or too little. |
| Path invalidation | The event identifies a concrete route such as a post URL or archive. | Invalidates route data for that path; include redirects, localized paths or related listings when they also depend on the change. |
| Time-based refresh | A delay is acceptable or a fallback is needed. | Refresh occurs after the interval and on a subsequent request according to the installed caching model. |
Next.js APIs evolve with the framework’s caching model. The current documentation distinguishes stale-while-revalidate behavior using revalidateTag with a cache profile from immediate expiration using updateTag, which is available only in Server Actions, and documents revalidatePath for route data. Check the documentation that matches your installed version before copying an example.
Implementation walkthrough
1. Inventory what the frontend reads
- List every WordPress resource the frontend requests: posts, pages, media, taxonomies, menus, options and custom data.
- Record the API route or GraphQL query, the authentication mode, and whether the response is cached.
- List every route that renders each resource, including home pages, archives, feeds, search, author pages and shared navigation.
- Mark which routes are public, preview-only or personalized.
2. Verify API discovery and permissions
For REST, inspect the site’s discovered namespaces and routes rather than assuming a default installation. Confirm that the required post types and fields are exposed. For GraphQL, inspect the schema and test the exact query used by the frontend. Test anonymous access separately from authenticated preview access.
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3. Establish canonical identities and tags
Choose a canonical identifier for each entity, normally the WordPress numeric ID, and map slugs and URLs to it. Define tags for individual entities and shared collections. Document which event changes each tag. This prevents one component from purging post:842 while another stores the same data under an unrelated key.
4. Connect WordPress events
Configure the event source to cover creation, updates, publication, unpublication, deletion, slug changes, taxonomy assignment, media changes and relevant custom-field or custom-table changes. If you use WPGraphQL Smart Cache, its documented graphql_purge action is one event source for the webhook pattern. A REST-only site may need a plugin or custom integration that emits an equivalent event.
5. Implement the server-side receiver
The receiver should authenticate and validate the request, translate the payload into your approved tags and paths, perform invalidation, and return a retryable error when invalidation fails. Keep it independent of the browser so a visitor cannot forge a purge request.
export async function POST(request) {
const suppliedSecret = request.headers.get('x-revalidation-secret');
if (suppliedSecret !== process.env.REVALIDATION_SECRET) {
return new Response('Unauthorized', { status: 401 });
}
const event = await request.json();
if (!Number.isInteger(event.id) || typeof event.event !== 'string') {
return new Response('Invalid event', { status: 400 });
}
// Map the validated event to approved tags and paths here.
// Call the revalidation functions supported by your installed Next.js version.
return Response.json({ accepted: true });
}This is a deliberately incomplete framework example: the authentication header, event schema and mapping must match your deployment, and the invalidation calls must match the Next.js version and runtime you operate.
6. Invalidate all affected dependencies
For a post edit, invalidate the post tag and every collection or route that displays the changed fields. For a slug change, invalidate both the old and new paths if the old URL can be cached or redirected. For a taxonomy change, invalidate the affected term, the post’s detail page if its taxonomy display changes, and all relevant archives. For a menu edit, invalidate every layout or page that embeds that menu.
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After invalidation, make a request that exercises the same path a visitor uses. Confirm that the frontend performs a new API or GraphQL fetch and that the response contains the changed value. Test through every cache layer—application, CDN and browser—rather than checking only an internal function’s return value.
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Cover the publishing and deletion edge cases
| Change | What to invalidate | Common failure |
|---|---|---|
| Create and publish | New detail path, post/entity tag, feeds, archives, search and any “latest” component. | The detail page works, but a listing remains cached. |
| Edit title or body | Entity tag plus every route that renders the changed fields. | Only the canonical article URL is refreshed. |
| Unpublish or change status | Entity, old public path, archives, feeds and search results. | A previously public page remains visible from a cache. |
| Delete | Entity, old path, listings, related content and redirects as applicable. | The API returns not found, but a static page still serves the deleted content. |
| Change slug | Old and new paths, entity tag, archives and redirect data. | The new URL is fresh while the old URL serves stale content. |
| Change taxonomy assignment | Post, old and new term pages, affected archives and navigation labels. | The post moves, but one category page still lists it. |
| Replace media | Media tag, image variants and every page that embeds the asset. | HTML updates but an image CDN key still points to the old file. |
| Change custom data | Tags and paths for the custom field, table or external source. | Core listeners do not observe the custom lifecycle. |
Deletion and unpublishing deserve explicit tests because a missing object can be cached just as easily as an old successful response. Decide whether the frontend should show a 404, a redirect or a deliberate “ no longer available” page, then invalidate the corresponding cached response.
Handle public content, previews and private data separately
WordPress distinguishes generally public REST data from private content. Public resources are commonly accessible anonymously, while private resources require authentication or explicit exposure. Do not make a private post public merely to simplify static generation.
Public rendering
- Fetch only fields intended for anonymous visitors.
- Cache the response at the appropriate layer and tag it with its content dependencies.
- Ensure that error responses and authorization failures are not cached as if they were valid public content.
Preview rendering
Preview requests need a trusted path from the editor to the frontend. The REST authentication documentation describes cookie authentication with nonces for a user logged into WordPress. That mechanism is designed for logged-in WordPress contexts; do not assume it is the correct credential flow for a separate production frontend. Use short-lived, least-privilege preview credentials or a signed preview request appropriate to your architecture, and keep preview responses out of public caches.
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- Mark preview requests so they use a private or bypass cache key.
- Validate the post ID, preview token, expiration and requested origin.
- Prevent draft content from being returned when the token is absent, expired or invalid.
- Clear preview cookies and tokens when the user exits preview mode.
Webhooks and private information
Webhook payloads should contain identifiers and change metadata, not post bodies, unpublished text or credentials. A purge event should tell the frontend what to fetch, not become a second content-delivery channel.
Diagnose a page that still shows old content
- Confirm the source: Check the WordPress editor status and query the API or GraphQL endpoint directly with the same visibility and authentication as the frontend.
- Confirm event creation: Look for a notification generated at publish, update, unpublish or delete time. If no event exists, inspect the WordPress integration and custom-data hooks.
- Confirm delivery: Check the receiver’s authentication, HTTP status, timeout and retry logs. A successful editor action does not prove that the webhook arrived.
- Confirm mapping: Verify that the payload’s entity ID, old and new slug, taxonomy and custom-data identifiers map to every required tag and path.
- Confirm invalidation: Inspect the frontend logs or cache provider to see whether the intended tag or route was invalidated.
- Confirm the next fetch: Request the page after invalidation and verify that a new API or GraphQL response was obtained.
- Check other caches: Purge or bypass CDN, reverse-proxy and browser caches only after fixing the dependency map; otherwise the same defect will return.
This end-to-end check matters because revalidation is not proof that a visitor received fresh content. Freshness is established only when the WordPress change, notification, handler, invalidation and subsequent data fetch all succeed.
Use reconciliation as a safety net
Keep a periodic refresh or reconciliation job even with event-driven invalidation. It can compare a lightweight WordPress change signal, modified timestamps or a known set of critical routes and repair missed events. Set the interval from your acceptable stale window and infrastructure budget: shorter intervals reduce detection delay but increase API and rendering work.
Record event IDs, receive times, processing duration, invalidated tags and paths, retries, and final verification results. Alert on repeated failures and on events that remain unprocessed beyond the agreed freshness target. A small, durable event log is more useful than a dashboard that reports only that the webhook endpoint returned HTTP 200.
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Practical launch checklist
- REST namespaces and routes or the WPGraphQL schema have been discovered and tested on the actual site.
- Public, authenticated and preview requests return only the fields appropriate to each audience.
- Every frontend route has a documented list of WordPress dependencies.
- Entity, collection, taxonomy, menu and custom-data tags follow one naming convention.
- Create, update, publish, unpublish, delete, slug, taxonomy, media and custom-data events are covered.
- The event receiver authenticates callers, validates payloads, limits input and is idempotent.
- Tag and path invalidation behavior matches the installed Next.js version and caching model.
- Old paths, redirects, archives, feeds, search and shared navigation are included where relevant.
- Preview responses cannot enter public caches, and credentials never appear in payloads or logs.
- Retries, dead-letter handling, reconciliation and freshness alerts are in place.
- A test proves the complete path from an editor change to the next visitor request.
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