Send a text message
POST/api/sessions/:sessionId/messages/send-text
Send a text message
Request
Responses
- 201
- 400
- 409
- 501
Message sent
Session not active or invalid request
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.
A caller-supplied customLinkPreview is not supported by the whatsapp-web.js engine — only Baileys can attach one. The send itself is supported on both; omit the field, or use linkPreview.