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Send your first message in seconds. Zavu handles channel selection, delivery optimization, and fallbacks automatically.

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Quick Start

import Zavudev from '@zavudev/sdk';

const zavu = new Zavudev({
  apiKey: process.env['ZAVUDEV_API_KEY'], // This is the default and can be omitted
});

const result = await zavu.messages.send({
  to: "+14155551234",
  text: "Hello from Zavu!",
});
You can optionally specify a sender by passing zavuSender (TypeScript), zavu_sender (Python), or the Zavu-Sender header (cURL). If omitted, your project’s default sender is used.
That’s it. Zavu automatically:
  • Respects user preference: When a user messages you first, we reply on the same channel they used
  • Optimizes outbound: For business-initiated messages, selects the optimal channel based on cost and delivery rates
  • Falls back intelligently: Tries alternative channels if delivery fails
  • Tracks everything: Delivery status updates via API and webhooks

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How It Works

When you send a message without specifying a channel, your default Sender handles routing: 
Your Message → Default Sender → Smart Routing → Best Channel → Delivery

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Senders

A Sender is a configuration that defines how messages are sent. Each Sender has:
  • Channels: Which channels are available (SMS, WhatsApp, etc.)
  • Routing Policy: smart (automatic) or manual (you choose)
  • Phone Numbers: Configured for each channel
Create your first Sender in the Dashboard or via the API.

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Using a Specific Sender

If you have multiple Senders (e.g., “Marketing” and “Support”), specify which one to use: 
const result = await zavu.messages.send({
  to: "+14155551234",
  text: "Your order has shipped!",
  zavuSender: "snd_abc123",
});

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Specifying a Channel

For full control, specify the channel directly: 
const result = await zavu.messages.send({
  to: "+14155551234",
  text: "Hello!",
  channel: "whatsapp",
});
Available channels: sms, whatsapp

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Response

A successful request returns the message details: 
{
  "message": {
    "id": "msg_abc123",
    "to": "+14155551234",
    "text": "Hello from Zavu!",
    "channel": "whatsapp",
    "status": "queued",
    "createdAt": "2024-01-15T10:30:00.000Z"
  }
}
StatusDescription
queuedMessage accepted, pending delivery
sentSent to carrier/provider
deliveredConfirmed delivered
readUser opened the message (WhatsApp only)
failedDelivery failed

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Next Steps

  • Smart Routing - Learn how automatic channel selection saves up to 90% on messaging costs
  • SMS Guide - SMS-specific features and best practices
  • WhatsApp Guide - Rich messaging with media, buttons, and templates