To specify a default value for Netlify CMS’s string widget, add the default property to it’s definition and assign it a value, as follows:
# ...
collections:
- name: "post"
# ..
fields:
- {label: "Author", name: "author", widget: "string", default: "Leonel Elimpe"}
# ..
As seen above in my posts collection, I’ve added an author field and given it a default value.
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