WhatsApp Web API (WWebJS) icon

WhatsApp Web API (WWebJS)

Interact with WhatsApp Web API via WWebJS — send messages, manage sessions, chats, groups, contacts and channels

Actions75

Client → Send Message

AI-generated

Summary

Send a WhatsApp message.

Inputs

  • sessionId (required) — Session identifier. Select from the list or use an expression. Falls back to credentials default if empty.
  • chatId (required) — The chat ID. Use number@c.us for individuals or number@g.us for groups.
  • contentType (required) — The type of message content to send.
  • content (required) — The text content of the message.
  • contentJson (required) — The content object (media, location, contact, or poll). See API docs for the expected structure.
  • quotedMessageId — Message ID to quote/reply to.
  • mentions — Comma-separated list of contact IDs to mention.
  • sendSeen — Whether to mark the chat as seen after sending.

Output shape

A single record merging the input JSON with the API response, containing fields such as success and a message object (id, from, to, body, timestamp, type, etc.).

Returns the sent message details; on error the workflow may throw unless continueOnFail is enabled.

Examples

Example 1: Send a simple text Hello to a user.

resource=client, operation=sendMessage, sessionId=default, chatId=1234567890@c.us, contentType=string, content=Hello

Example 2: Send an image using base64 via contentJson.

resource=client, operation=sendMessage, contentType=MessageMedia, contentJson={"media":"base64string"}, chatId=1234567890@c.us

Example 3: Send a message with mentions and quote another message.

resource=client, operation=sendMessage, chatId=1234567890@c.us, content=Check this out, mentions=1234567890@c.us,9876543210@c.us, quotedMessageId=9876543210@c.us_123

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