[BUG] Chatwoot integration: backslash added before newlines in messages

[cgmparra]

Description

When sending messages with line breaks from Chatwoot to WhatsApp via Evolution API native integration, a backslash \ is added before each newline character.

Environment

• Evolution API version: 2.3.7 (latest)
• • Chatwoot version: 4.10.1
• • • Integration type: Native Chatwoot integration via Evolution panel

Expected behavior

Message sent from Chatwoot:

Teste
Quebrando

Linhas

Actual behavior

Message received on WhatsApp:

Teste \
Quebrando \
 \
Linhas

Evidence from logs

The message is already arriving with escaped backslashes in Evolution:

message: Message {
  extendedTextMessage: {
    text: 'Teste \\\nQuebrando \\\n \\\nLinhas',
    contextInfo: [Object]
  }
}

Test performed

Sending directly via Evolution API (without Chatwoot) works correctly:

curl -X POST "https://evo.domain.com/message/sendText/INSTANCE" \
  -H "apikey: xxxxx" \
  -H "Content-Type: application/json" \
  -d '{"number": "5511999999999", "text": "Test\nBreaking\n\nLines"}'

This message arrives correctly on WhatsApp without backslashes.

Conclusion

The issue occurs in how Chatwoot sends the webhook to Evolution, or how Evolution processes the incoming Chatwoot payload. The text is being double-escaped somewhere in this flow.

Suggested fix

Add a sanitization step when receiving messages from Chatwoot:

text = text.replace(/\\\n/g, '\n');