Common Mistakes When Migrating from WordPress to a Headless CMS

A WordPress-to-headless migration includes content models, rich text, media, URLs, SEO fields, and editor workflows. Audit each of those before writing the import scripts, then test the result on representative content.

Mistake 1: Copying the WordPress Schema Into the New CMS

WordPress content is organized around posts, pages, categories, and custom post types. Teams often migrate by mapping each of these directly into the headless CMS as equivalent types. The result is a schema that carries over every structural compromise WordPress forced on the original team — custom post types that were workarounds, taxonomies that grew organically without design, meta fields that held everything from SEO data to unstructured JSON blobs.

What to do instead: Use the migration as an opportunity to redesign the content model from scratch, guided by what the content actually is rather than how WordPress stored it. Audit every post type, separate reusable content from presentation markup, and design clean types before you write a single import script.

Mistake 2: Migrating Rich Text Without a Strategy

WordPress post content is HTML. Most headless CMS platforms use structured rich text formats — Sanity's Portable Text, Contentful's Rich Text, Lexical in Payload — that are not HTML. Running the WordPress HTML through a converter and importing it as a rich text field produces technically valid content but with embedded formatting, inline styles, and legacy markup that breaks the separation between content and presentation.

What to do instead: Decide on the rich text strategy before import. Strip formatting that should come from CSS. Define which embedded content types (callouts, videos, code blocks) belong in structured entries rather than raw HTML. Run a sample migration on fifty posts and review the output manually before processing the full archive.

Mistake 3: Ignoring the URL and Redirect Strategy

WordPress URLs are usually path-based and follow predictable structures like /category/post-slug/. A headless CMS migration often changes how slugs are generated, how categories map to URL segments, or how paginated archives are structured. Teams that do not audit their URL inventory before migration end up breaking inbound links and disrupting search traffic.

What to do instead: Export every URL from the current WordPress site before starting the migration. Map each URL to its intended destination on the new site. Implement redirects before launch, not after. Treat the redirect map as a first-class deliverable, not an afterthought.

Mistake 4: Underestimating Editor Retraining

Editors who have used WordPress for years have built workflows around its interface — the block editor, media library, category assignment, scheduling. A headless CMS with a different interface requires training. Teams that skip this step launch a CMS that editors avoid, default to asking developers for content changes, or adopt workarounds that gradually corrupt the content model.

What to do instead: Involve editors in the CMS selection process. Run actual editing sessions during the evaluation phase. Build documentation specific to your schema and workflows, not generic platform documentation. Plan two to four weeks of parallel operation where editors can ask questions before the old system is turned off.

Mistake 5: Not Planning for Media Migration

WordPress media is stored in wp-content/uploads with auto-generated thumbnails, crop variants, and attachment post types that carry alt text, captions, and descriptions. Headless CMS platforms handle media through their own asset management — Sanity's image pipeline, Contentful's asset management, Cloudinary, or a custom solution.

Teams that do not plan the media migration end up with broken image references, missing alt text, or all images consolidated into a single folder with no organization.

What to do instead: Audit the media library size and structure. Decide whether to use the CMS's native asset management or a separate DAM. Write import scripts that preserve alt text and captions as structured fields, not just copy the binary files. Test image rendering on the new frontend before migrating the content that references those images.

Mistake 6: Skipping the SEO Field Audit

WordPress SEO is typically managed through plugins like Yoast or RankMath, which store meta titles, descriptions, canonical URLs, and Open Graph data as post meta fields. These fields are invisible in a WordPress export unless specifically included.

What to do instead: Export all SEO meta fields alongside the main content. Map them to equivalent fields in your headless CMS schema. Verify that the new frontend is reading and rendering them correctly with a tool like a head inspector or the Google URL Inspection tool before launch.

Mistake 7: Treating the Migration as a One-Time Event

A migration can reveal content issues after launch. Editors will find content that was not migrated correctly. Formatting will need cleanup. Edge cases will surface that the import script did not handle. Teams that treat the migration as a closed project rather than an ongoing process end up with a content archive that is partially correct and partially broken.

What to do instead: Keep the original WordPress site accessible in read-only mode for at least ninety days after migration. Run automated checks that compare post counts, slug presence, and image references between the old and new systems. Plan a two-week post-launch period specifically for content quality review.

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Verify the migration with editors and developers: content should render correctly, URLs should resolve as planned, and routine publishing tasks should work without undocumented workarounds.

For help scoping and validating a WordPress migration, talk to LinkIT.