Use prefill tags and reusable templates to pre-populate signer fields in a Box Sign request
domain: developer.box.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Create a Box Sign reusable template (via the Box web app) with text, date, and signature fields, each carrying a document_tag_id you'll reference later.
List templates to retrieve the template_id and inspect each signer's inputs document_tag_id values via the Box Sign template listing API.
Call the sign-requests create endpoint with template_id set and a signers array whose entries are in the exact same order as the signers defined in the template.
Add a prefill_tags array of objects pairing document_tag_id with a text_value to auto-populate matching template fields (e.g., signer full names) before sending.
Submit the request and confirm a created status in the response, which echoes back the resolved signers and prefill_tags.
Known gotchas
Prefill tags created inside a template via the Box web app are not always accessible/settable through the API — availability of a given document_tag_id depends on how the template was authored.
Signer order in the API request must exactly match the template's original signer order, or Box assigns inputs to the wrong signer.
Once a sign request is created from a template, its field set is fixed — you cannot add fields beyond what prefill_tags can populate for the existing template placeholders.
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