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How do I migrate a template with all its fields and values to a new site? Is their an export/import process?

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Use the fields import / export functionality and respective the same for templates.

Go to admin fields and click export, then select all the fields you need.

Go to admin templates and click export, then select the template(s) you need.

 

Edit:

Additionally you may use the API:

https://processwire.com/api/ref/templates/get-export-data/
https://processwire.com/api/ref/templates/set-import-data/

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