Get a specific contact by ID
GET/api/sessions/:sessionId/contacts/:contactId
Get a specific contact by ID
Request
Responses
- 200
- 404
- 409
- 503
Contact details
Contact not found
The session is not connected — an engine exists for it but is not ready: disconnected, reconnecting, or still initializing, so the request never reached WhatsApp. Wait for ready and retry. A session that was never started answers 400 instead, and the session lifecycle routes answer 409 for a conflicting state rather than this. One window answers this while the session still reads ready: WhatsApp Web periodically reloads its own page and the engine re-injects into it — for those few seconds the answer is a 409 naming the reload; retry shortly.
The whatsapp-web.js page connection died mid-read, so the lookup could not reach an answer. Distinct from the 404 above, which asserts the contact does not exist: this one asserts nothing about the contact. Retry once the session is ready again.