@sendly/node

@sendly/node

Official Node.js SDK for the Sendly SMS API.

Installation

npm install @sendly/node
# or
yarn add @sendly/node
# or
pnpm add @sendly/node

Requirements

• Node.js 18.0.0 or higher
• A Sendly API key (get one here)

Quick Start

import Sendly from '@sendly/node';

// Initialize with your API key
const sendly = new Sendly('sk_live_v1_your_api_key');

// Send an SMS
const message = await sendly.messages.send({
  to: '[phone]',
  text: 'Hello from Sendly!'
});

console.log(`Message sent: ${message.id}`);
console.log(`Status: ${message.status}`);

Prerequisites for Live Messaging

Before sending live SMS messages, you need:

• Business Verification - Complete verification in the Sendly dashboard

  • International: Instant approval (just provide Sender ID)
  • US/Canada: Requires carrier approval (3-7 business days)

• Credits - Add credits to your account

  • Test keys (sk_test_*) work without credits (sandbox mode)
  • Live keys (sk_live_*) require credits for each message

• Live API Key - Generate after verification + credits

  • Dashboard → API Keys → Create Live Key

Test vs Live Keys

Key Type	Prefix	Credits Required	Verification Required	Use Case
Test	sk_test_v1_*	No	No	Development, testing
Live	sk_live_v1_*	Yes	Yes	Production messaging

Note: You can start development immediately with a test key. Messages to sandbox test numbers are free and don't require verification.

Features

• ✅ Full TypeScript support with exported types
• ✅ Automatic retries with exponential backoff
• ✅ Rate limit handling (respects Retry-After)
• ✅ Promise-based async/await API
• ✅ ESM and CommonJS support
• ✅ Zero runtime dependencies

Usage

Sending Messages

import Sendly from '@sendly/node';

const sendly = new Sendly('sk_live_v1_xxx');

// Basic usage
const message = await sendly.messages.send({
  to: '[phone]',
  text: 'Your verification code is: 123456'
});

// With custom sender ID (international)
const message = await sendly.messages.send({
  to: '[phone]',
  text: 'Hello from MyApp!',
  from: 'MYAPP'
});

Listing Messages

// Get recent messages (default limit: 50)
const { data: messages, count } = await sendly.messages.list();

// Get last 10 messages
const { data: messages } = await sendly.messages.list({ limit: 10 });

// Iterate through messages
for (const msg of messages) {
  console.log(`${msg.to}: ${msg.status}`);
}

Getting a Message

const message = await sendly.messages.get('msg_xxx');

console.log(`Status: ${message.status}`);
console.log(`Delivered: ${message.deliveredAt}`);

Rate Limit Information

// After any API call, you can check rate limit status
await sendly.messages.send({ to: '+1555...', text: 'Hello!' });

const rateLimit = sendly.getRateLimitInfo();
if (rateLimit) {
  console.log(`${rateLimit.remaining}/${rateLimit.limit} requests remaining`);
  console.log(`Resets in ${rateLimit.reset} seconds`);
}

Configuration

import Sendly from '@sendly/node';

const sendly = new Sendly({
  apiKey: 'sk_live_v1_xxx',
  
  // Optional: Custom base URL (for testing)
  baseUrl: 'https://sendly.live/api/v1',
  
  // Optional: Request timeout in ms (default: 30000)
  timeout: 60000,
  
  // Optional: Max retry attempts (default: 3)
  maxRetries: 5
});

Error Handling

The SDK provides typed error classes for different error scenarios:

import Sendly, {
  SendlyError,
  AuthenticationError,
  RateLimitError,
  InsufficientCreditsError,
  ValidationError,
  NotFoundError
} from '@sendly/node';

const sendly = new Sendly('sk_live_v1_xxx');

try {
  await sendly.messages.send({
    to: '[phone]',
    text: 'Hello!'
  });
} catch (error) {
  if (error instanceof AuthenticationError) {
    console.error('Invalid API key:', error.message);
  } else if (error instanceof RateLimitError) {
    console.error(`Rate limited. Retry after ${error.retryAfter} seconds`);
  } else if (error instanceof InsufficientCreditsError) {
    console.error(`Not enough credits. Need ${error.creditsNeeded}, have ${error.currentBalance}`);
  } else if (error instanceof ValidationError) {
    console.error('Invalid request:', error.message);
  } else if (error instanceof NotFoundError) {
    console.error('Resource not found:', error.message);
  } else if (error instanceof SendlyError) {
    console.error(`API error [${error.code}]:`, error.message);
  } else {
    throw error;
  }
}

Testing (Sandbox Mode)

Use a test API key (sk_test_v1_xxx) to test without sending real messages:

import Sendly, { SANDBOX_TEST_NUMBERS } from '@sendly/node';

const sendly = new Sendly('sk_test_v1_xxx');

// Check if in test mode
console.log(sendly.isTestMode()); // true

// Use sandbox test numbers
await sendly.messages.send({
  to: SANDBOX_TEST_NUMBERS.SUCCESS,  // [phone] - Always succeeds
  text: 'Test message'
});

await sendly.messages.send({
  to: SANDBOX_TEST_NUMBERS.INVALID,  // [phone] - Returns invalid_number error
  text: 'Test message'
});

Available Test Numbers

Number	Behavior
[phone]	Instant success
[phone]	Success after 10s delay
[phone]	Fails: invalid_number
[phone]	Fails: carrier_rejected (2s delay)
[phone]	Fails: rate_limit_exceeded

Pricing Tiers

import { CREDITS_PER_SMS, SUPPORTED_COUNTRIES } from '@sendly/node';

// Credits per SMS by tier
console.log(CREDITS_PER_SMS.domestic); // 1 (US/Canada)
console.log(CREDITS_PER_SMS.tier1);    // 8 (UK, Poland, India, etc.)
console.log(CREDITS_PER_SMS.tier2);    // 12 (France, Japan, Australia, etc.)
console.log(CREDITS_PER_SMS.tier3);    // 16 (Germany, Italy, Mexico, etc.)

// Supported countries by tier
console.log(SUPPORTED_COUNTRIES.domestic); // ['US', 'CA']
console.log(SUPPORTED_COUNTRIES.tier1);    // ['GB', 'PL', 'IN', ...]

Utilities

The SDK exports validation utilities for advanced use cases:

import {
  validatePhoneNumber,
  getCountryFromPhone,
  isCountrySupported,
  calculateSegments
} from '@sendly/node';

// Validate phone number format
validatePhoneNumber('[phone]'); // OK
validatePhoneNumber('555-1234'); // Throws ValidationError

// Get country from phone number
getCountryFromPhone('[phone]'); // 'GB'
getCountryFromPhone('[phone]');  // 'US'

// Check if country is supported
isCountrySupported('GB'); // true
isCountrySupported('XX'); // false

// Calculate SMS segments
calculateSegments('Hello!'); // 1
calculateSegments('A'.repeat(200)); // 2

TypeScript

The SDK is written in TypeScript and exports all types:

import type {
  SendlyConfig,
  SendMessageRequest,
  Message,
  MessageStatus,
  ListMessagesOptions,
  MessageListResponse,
  RateLimitInfo,
  PricingTier
} from '@sendly/node';

API Reference

Sendly

Constructor

new Sendly(apiKey: string)
new Sendly(config: SendlyConfig)

Properties

• messages - Messages resource

Methods

• isTestMode() - Returns true if using a test API key
• getRateLimitInfo() - Returns current rate limit info
• getBaseUrl() - Returns configured base URL

sendly.messages

send(request: SendMessageRequest): Promise<Message>

Send an SMS message.

list(options?: ListMessagesOptions): Promise<MessageListResponse>

List sent messages.

get(id: string): Promise<Message>

Get a specific message by ID.

Support

• 📚 Documentation
• 💬 Discord
• 📧 [e-mail]

License

MIT