Customizing Emails by Language

When you register a user, you can create meta-data about them.

Creating meta-data with the JS-Client's signUp function

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const { data, error } = await supabase.auth.signUp({
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  email: 'email@some_[email.com](http://email.com/)',
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  password: 'example-password',
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  options: {
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    data: {
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      first_name: 'John',
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      last_name: 'Doe',
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      age: 27,
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    },
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  },
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})

The above example creates a user entry that includes information about their name and age. The data is stored in the auth.users table in the auth.raw_user_meta_data column. You can view it in the auth schema with the SQL Editor.

It can be accessed in a project's Email Templates. Below is an example:

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<h2>Hello, {{ .Data.first_name }} {{ .Data.last_name }}!</h2>
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<p>Follow this link to confirm your account:</p>
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<p><a href="{{ .ConfirmationURL }}">Confirm your account</a></p>

If you need to update a user's meta-data, you can do so with the updateUser function.

The meta-data can be used to store a users language preferences. You could then use "if statements" in the email template to set the response for a specific language:

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{{if eq .Data.language "en" }}
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<h1>Welcome!</h1>
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{{ else if eq .Data.language "pl" }}
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<h1>Witamy!</h1>
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{{ else }}
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<h1>chuS'ugh, tera' je (Klingon)</h1>
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{{end}}

Supabase uses the Go Templating Language to render emails. It has advanced features for conditions that you may want to explore. For more examples, there is a GitHub discussion that discusses advanced language templates.