fern-api/Docs Migration Diff
Compare production docs against a Fern preview deployment and report visual/structural/text differences
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Inputs
| name | description | required | default |
|---|---|---|---|
| production-url | Production docs URL (e.g. https://developers.webflow.com) | yes | — |
| preview-url | Preview docs URL (if not provided, runs fern generate --docs --preview to get one) | no | "" |
| fern-token | Fern token for generating preview (required if preview-url is not provided) | no | "" |
| sitemap-url | Custom sitemap URL (defaults to production-url/sitemap.xml) | no | "" |
| filter | Only check pages matching this path pattern (e.g. /api-reference) | no | "" |
| concurrency | Number of parallel page comparisons | no | 10 |
| diff-threshold | Pixel diff percentage threshold for embedding images in report | no | 2 |
| check-header | Include header elements in comparisons | no | false |
| check-sidebar | Include sidebar elements in comparisons | no | false |
| check-footer | Include footer elements in comparisons | no | false |
Outputs
| name | description |
|---|---|
| preview-url | The preview URL used for comparison |
| has-changes | Whether any pages have changes (true/false) |