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Angular NG0504 means ngSkipHydration is attached to something that is not a component host. Remove it from the ordinary HTML element, or move it to the host element of the component you intend to skip.
Why Angular reports NG0504
ngSkipHydration tells Angular not to hydrate a component. Angular permits it only on a component host node, either directly in a template or through a host binding. An ordinary element such as a <div> inside a template is not a component host, so placing the attribute there triggers NG0504. A directive host binding does not make that <div> a component host. Angular’s NG0504 reference documents both invalid placements.
Fix NG0504 by removing or relocating the attribute
- Find the element identified by the error in the relevant template or host binding.
- If it is an ordinary DOM element, remove
ngSkipHydrationfrom it. - If you need to skip hydration for a component, put the attribute on that component’s host node instead. Angular supports the host node placement in a template or via a component host binding.
For example, this placement is invalid because the <div> is not a component host:
<div ngSkipHydration>...</div>
Move the annotation to the host element of the component whose hydration you intend to skip, rather than to an element inside its template.
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What skipping hydration changes
When the attribute is validly applied to a component host, Angular skips hydration for that component and its children. It destroys and renders them again as though hydration were not enabled. That can work around a rendering problem, but those parts of the page do not receive hydration’s benefits while the annotation remains. Angular describes skipping as a workaround and recommends fixing hydration-breaking patterns so the annotation can eventually be removed. See the Angular hydration guide.
If hydration errors continue
NG0504 is a placement error. If correcting the placement leaves a hydration mismatch, investigate the underlying mismatch separately. Angular identifies direct DOM manipulation and invalid HTML structure as possible causes. Examples include a table without an explicit <tbody>, a <div> inside a <p>, or nested anchors. The NG0500 hydration mismatch reference explains that adjacent error category.
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Angular DevTools, available as a browser extension, can show hydration status and highlight a component associated with a mismatch, as described in the hydration guide.
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