FormData - Postboi

Pass a FormData object as the body and Postboi converts it into a tidy HTML table. This is what powers the SvelteKit form actions — but you can pass FormData to any send() call.

Special fields

These keys are extracted from the body and applied to the send options instead of appearing in the table:

_to, _from, _subject, _reply_to
_cc, _bcc — comma-separated or repeated

Values can be base64-encoded; they’ll be decoded automatically.

Grouped fields

Use the fieldset→field syntax to group related fields into sections:

<input name="contact→name" />
<input name="contact→email" />
<input name="order→product" />
<input name="order→quantity" />

<input name="contact→name" />
<input name="contact→email" />
<input name="order→product" />
<input name="order→quantity" />

This produces sectioned tables in the email body — one section per fieldset (contact, order), with a row per field.

Attachments

Attachments work from file inputs (details→files) or via attachments: File | File[] on send().

<input type="file" name="details→attachments" multiple />

<input type="file" name="details→attachments" multiple />

Customising the labels

The formatter option on send() controls how fieldset and field labels are rendered — pass null or false to a part to leave those labels untouched.