Node.js SDK

Learn how to integrate the Brevo API into your Node.js and browser applications.

Overview

The Brevo Node.js SDK (@getbrevo/brevo) is a TypeScript-first client library for the Brevo API. It provides:

A unified BrevoClient with namespaced service clients
Full TypeScript types with IDE autocomplete
Promise-based async/await API
Automatic retries with exponential backoff
Custom fetch support for any runtime
Structured error handling with typed error classes

Version 6.0 introduces breaking changes versus v5.x. v5.x remains supported and continues to receive wire-compatibility fixes — see the changelog for the list of changes and the README for migration steps.

Requirements

Node.js 18+
Also compatible with: Vercel, Cloudflare Workers, Deno v1.25+, Bun 1.0+, React Native

Installation

$ npm install @getbrevo/brevo

Quick start

Initialize the client and send your first email:

quick-start.ts

1 import { BrevoClient } from '@getbrevo/brevo';
2 
3 const brevo = new BrevoClient({ apiKey: 'your-api-key' });
4 
5 const result = await brevo.transactionalEmails.sendTransacEmail({
6   subject: 'Hello from Brevo!',
7   htmlContent: '<html><body><p>Hello,</p><p>This is my first transactional email.</p></body></html>',
8   sender: { name: 'Alex from Brevo', email: 'hello@brevo.com' },
9   to: [{ email: 'johndoe@example.com', name: 'John Doe' }],
10 });
11 
12 console.log('Email sent. Message ID:', result.messageId);

Configuration

Pass options to the constructor to configure timeout, retries, and other settings:

configuration.ts

1 const brevo = new BrevoClient({
2   apiKey: 'your-api-key',
3   timeoutInSeconds: 30,
4   maxRetries: 3,
5 });

Constructor options

Option	Type	Default	Description
`apiKey`	`string`	Required	Your Brevo API key
`timeoutInSeconds`	`number`	`60`	Default request timeout in seconds
`maxRetries`	`number`	`2`	Maximum retry attempts on retryable errors
`baseUrl`	`string`	`null`	Override the default API base URL
`fetch`	`typeof fetch`	`null`	Custom fetch implementation
`headers`	`Record<string, string>`	`null`	Additional default headers sent with every request
`logging`	`LogConfig \| Logger`	`null`	Logging configuration

Error handling

The SDK throws typed error classes based on HTTP status codes:

error-handling.ts

1 import {
2   BrevoError,
3   UnauthorizedError,
4   TooManyRequestsError,
5 } from '@getbrevo/brevo';
6 
7 try {
8   await brevo.transactionalEmails.sendTransacEmail({ ... });
9 } catch (err) {
10   if (err instanceof UnauthorizedError) {
11     console.error('Invalid API key');
12   } else if (err instanceof TooManyRequestsError) {
13     const retryAfter = err.rawResponse.headers['retry-after'];
14     console.error(`Rate limited. Retry after ${retryAfter}s`);
15   } else if (err instanceof BrevoError) {
16     console.error(`API error ${err.statusCode}:`, err.message);
17   }
18 }

Error classes

Status code	Class
`400`	`BadRequestError`
`401`	`UnauthorizedError`
`403`	`ForbiddenError`
`404`	`NotFoundError`
`422`	`UnprocessableEntityError`
`429`	`TooManyRequestsError`
`500+`	`InternalServerError`

All BrevoError instances expose:

statusCode — HTTP status code
message — Error message
body — Parsed response body
rawResponse — Raw response with headers

Retries

Automatic retries with exponential backoff are enabled by default (2 retries). Configure at the client or request level:

retries.ts

1 // Client-level
2 const brevo = new BrevoClient({
3   apiKey: 'your-api-key',
4   maxRetries: 3,
5 });
6 
7 // Request-level (overrides client setting)
8 await brevo.transactionalEmails.sendTransacEmail({ ... }, {
9   maxRetries: 0, // Disable retries for this request
10 });

Retry behavior

Retryable status codes: 408, 429, 500, 502, 503, 504
Backoff schedule: ~1s, ~2s, ~4s (exponential with jitter)
Rate limit headers: Respects Retry-After response header

Timeouts

Default timeout is 60 seconds. Configure at the client or request level:

timeouts.ts

1 // Client-level
2 const brevo = new BrevoClient({
3   apiKey: 'your-api-key',
4   timeoutInSeconds: 30,
5 });
6 
7 // Request-level (overrides client setting)
8 await brevo.transactionalEmails.sendTransacEmail({ ... }, {
9   timeoutInSeconds: 10,
10 });

Recommended timeout values

Use case	Timeout
Standard API calls	`30–60s` (default)
Quick operations	`10–15s`
Bulk operations	`120–300s`
Real-time / low-latency	`5–10s`

Request options

All service methods accept a request options object as the final argument:

request-options.ts

1 await brevo.transactionalEmails.sendTransacEmail({ ... }, {
2   timeoutInSeconds: 10,
3   maxRetries: 1,
4   headers: { 'X-Custom-Header': 'custom-value' },
5   queryParams: { customParam: 'value' },
6 });

Abort signal

Cancel in-flight requests using the Web AbortController API:

abort-signal.ts

1 const controller = new AbortController();
2 
3 await brevo.transactionalEmails.sendTransacEmail({ ... }, {
4   abortSignal: controller.signal,
5 });
6 
7 controller.abort(); // Cancel the request

Raw response

Access response headers and metadata via .withRawResponse():

raw-response.ts

1 const { data, rawResponse } = await brevo.transactionalEmails
2   .sendTransacEmail({ ... })
3   .withRawResponse();
4 
5 console.log(rawResponse.headers['x-request-id']);
6 console.log(data.messageId);

Binary responses

Endpoints that return binary content (e.g., attachment downloads) expose multiple consumption methods:

binary-responses.ts

1 const response = await brevo.inboundParsing.getInboundEmailAttachment(downloadToken);
2 
3 const stream      = response.stream();
4 const arrayBuffer = await response.arrayBuffer();
5 const blob        = await response.blob();
6 const bytes       = await response.bytes();

Saving binary content

Node.js (ReadableStream)

1 import { createWriteStream } from 'fs';
2 import { Readable } from 'stream';
3 import { pipeline } from 'stream/promises';
4 
5 const stream = response.stream();
6 await pipeline(Readable.fromWeb(stream), createWriteStream('path/to/file'));

Bun

1 await Bun.write('path/to/file', response.stream());

Browser

1 const blob = await response.blob();
2 const url = URL.createObjectURL(blob);
3 const a = document.createElement('a');
4 a.href = url;
5 a.download = 'filename';
6 a.click();
7 URL.revokeObjectURL(url);

TypeScript types

All request and response types are exported from the package:

typescript-types.ts

1 import type { Brevo } from '@getbrevo/brevo';
2 
3 const request: Brevo.SendTransacEmailRequest = {
4   subject: 'First email',
5   textContent: 'Hello world!',
6   sender: { name: 'Bob Wilson', email: 'bob.wilson@brevo.com' },
7   to: [{ email: 'sarah.davis@example.com', name: 'Sarah Davis' }],
8 };

Logging

Configure logging to inspect outgoing requests and responses:

logging.ts

1 import { BrevoClient, logging } from '@getbrevo/brevo';
2 
3 const brevo = new BrevoClient({
4   apiKey: 'your-api-key',
5   logging: {
6     level: logging.LogLevel.Debug,
7     logger: new logging.ConsoleLogger(),
8   },
9 });

Custom logger

Integrate with any logging library by implementing the ILogger interface:

custom-logger.ts

1 import winston from 'winston';
2 import { logging } from '@getbrevo/brevo';
3 
4 const winstonLogger = winston.createLogger({
5   level: 'info',
6   format: winston.format.json(),
7   transports: [new winston.transports.Console()],
8 });
9 
10 const logger: logging.ILogger = {
11   debug: (msg, ...args) => winstonLogger.debug(msg, ...args),
12   info:  (msg, ...args) => winstonLogger.info(msg, ...args),
13   warn:  (msg, ...args) => winstonLogger.warn(msg, ...args),
14   error: (msg, ...args) => winstonLogger.error(msg, ...args),
15 };
16 
17 const brevo = new BrevoClient({
18   apiKey: 'your-api-key',
19   logging: { level: logging.LogLevel.Debug, logger },
20 });

Custom fetch

Override the default fetch implementation for any runtime or to add request interceptors:

custom-fetch.ts

1 const brevo = new BrevoClient({
2   apiKey: 'your-api-key',
3   fetch: async (url, options) => {
4     console.log('→', url);
5     const response = await fetch(url, options);
6     console.log('←', response.status);
7     return response;
8   },
9 });

Common integrations

node-fetch

1 import fetch from 'node-fetch';
2 
3 const brevo = new BrevoClient({
4   apiKey: 'your-api-key',
5   fetch: fetch as typeof globalThis.fetch,
6 });

undici

1 import { fetch } from 'undici';
2 
3 const brevo = new BrevoClient({
4   apiKey: 'your-api-key',
5   fetch: fetch as typeof globalThis.fetch,
6 });

With request ID header

1 import { randomUUID } from 'crypto';
2 
3 const brevo = new BrevoClient({
4   apiKey: 'your-api-key',
5   fetch: async (url, options) => {
6     return fetch(url, {
7       ...options,
8       headers: {
9         ...options?.headers,
10         'X-Request-ID': randomUUID(),
11       },
12     });
13   },
14 });

Available services

The BrevoClient exposes the following service namespaces:

Property	Description
`transactionalEmails`	Send emails, manage templates, blocked contacts and domains
`transactionalSms`	Send SMS messages and view delivery statistics
`transactionalWhatsApp`	Send WhatsApp messages and view event reports
`smsTemplates`	Manage SMS templates
`contacts`	Manage contacts, lists, folders, attributes and segments
`emailCampaigns`	Create and manage email marketing campaigns
`smsCampaigns`	Create and manage SMS marketing campaigns
`whatsAppCampaigns`	Create and manage WhatsApp campaigns and templates
`companies`	Manage CRM companies
`deals`	Manage CRM deals and pipelines
`tasks`	Manage CRM tasks
`notes`	Manage CRM notes
`files`	Upload and manage CRM files
`conversations`	Manage conversation messages and automated messages
`ecommerce`	Manage products, categories, orders and attribution
`coupons`	Manage coupon collections and coupons
`payments`	Create and manage payment requests
`event`	Track custom events
`webhooks`	Manage webhooks
`senders`	Manage senders and IPs
`domains`	Manage and authenticate domains
`account`	Retrieve account information and activity logs
`inboundParsing`	Retrieve inbound email events and attachments
`customObjects`	Manage custom object records
`externalFeeds`	Manage external RSS feeds
`masterAccount`	Manage sub-accounts and groups (enterprise)
`user`	Manage users and permissions
`process`	Retrieve background process status
`program`	Manage loyalty programs
`balance`	Manage loyalty balances and transactions
`reward`	Manage loyalty rewards and vouchers
`tier`	Manage loyalty tiers and tier groups

Migration from v3.x

Key changes

Area	v3.x	v5.x
Client	`new TransactionalEmailsApi()` per resource	`new BrevoClient({ apiKey })` unified
Auth	`(api as any).authentications.apiKey.apiKey = "..."`	Constructor option
API style	Class-based with setters	Promise-based with inline objects
TypeScript	Partial	Full, exported types
Retries	Not built-in	Automatic with exponential backoff

Migration example

1 // v3.x
2 import { TransactionalEmailsApi, SendSmtpEmail } from '@getbrevo/brevo';
3 
4 let emailAPI = new TransactionalEmailsApi();
5 (emailAPI as any).authentications.apiKey.apiKey = 'xkeysib-xxx';
6 
7 let message = new SendSmtpEmail();
8 message.subject = 'First email';
9 message.textContent = 'Hello world!';
10 message.sender = { name: 'Bob Wilson', email: 'bob.wilson@brevo.com' };
11 message.to = [{ email: 'sarah.davis@example.com', name: 'Sarah Davis' }];
12 
13 emailAPI.sendTransacEmail(message);

1	import { BrevoClient } from '@getbrevo/brevo';
2
3	const brevo = new BrevoClient({ apiKey: 'your-api-key' });
4
5	const result = await brevo.transactionalEmails.sendTransacEmail({
6	subject: 'Hello from Brevo!',
7	htmlContent: '<html><body><p>Hello,</p><p>This is my first transactional email.</p></body></html>',
8	sender: { name: 'Alex from Brevo', email: 'hello@brevo.com' },
9	to: [{ email: 'johndoe@example.com', name: 'John Doe' }],
10	});
11
12	console.log('Email sent. Message ID:', result.messageId);

1	const brevo = new BrevoClient({
2	apiKey: 'your-api-key',
3	timeoutInSeconds: 30,
4	maxRetries: 3,
5	});

1	import {
2	BrevoError,
3	UnauthorizedError,
4	TooManyRequestsError,
5	} from '@getbrevo/brevo';
6
7	try {
8	await brevo.transactionalEmails.sendTransacEmail({ ... });
9	} catch (err) {
10	if (err instanceof UnauthorizedError) {
11	console.error('Invalid API key');
12	} else if (err instanceof TooManyRequestsError) {
13	const retryAfter = err.rawResponse.headers['retry-after'];
14	console.error(`Rate limited. Retry after ${retryAfter}s`);
15	} else if (err instanceof BrevoError) {
16	console.error(`API error ${err.statusCode}:`, err.message);
17	}
18	}

1	// Client-level
2	const brevo = new BrevoClient({
3	apiKey: 'your-api-key',
4	maxRetries: 3,
5	});
6
7	// Request-level (overrides client setting)
8	await brevo.transactionalEmails.sendTransacEmail({ ... }, {
9	maxRetries: 0, // Disable retries for this request
10	});

1	await brevo.transactionalEmails.sendTransacEmail({ ... }, {
2	timeoutInSeconds: 10,
3	maxRetries: 1,
4	headers: { 'X-Custom-Header': 'custom-value' },
5	queryParams: { customParam: 'value' },
6	});

1	const controller = new AbortController();
2
3	await brevo.transactionalEmails.sendTransacEmail({ ... }, {
4	abortSignal: controller.signal,
5	});
6
7	controller.abort(); // Cancel the request

1	const { data, rawResponse } = await brevo.transactionalEmails
2	.sendTransacEmail({ ... })
3	.withRawResponse();
4
5	console.log(rawResponse.headers['x-request-id']);
6	console.log(data.messageId);

1	const response = await brevo.inboundParsing.getInboundEmailAttachment(downloadToken);
2
3	const stream = response.stream();
4	const arrayBuffer = await response.arrayBuffer();
5	const blob = await response.blob();
6	const bytes = await response.bytes();

1	import { createWriteStream } from 'fs';
2	import { Readable } from 'stream';
3	import { pipeline } from 'stream/promises';
4
5	const stream = response.stream();
6	await pipeline(Readable.fromWeb(stream), createWriteStream('path/to/file'));

1	const blob = await response.blob();
2	const url = URL.createObjectURL(blob);
3	const a = document.createElement('a');
4	a.href = url;
5	a.download = 'filename';
6	a.click();
7	URL.revokeObjectURL(url);

1	import type { Brevo } from '@getbrevo/brevo';
2
3	const request: Brevo.SendTransacEmailRequest = {
4	subject: 'First email',
5	textContent: 'Hello world!',
6	sender: { name: 'Bob Wilson', email: 'bob.wilson@brevo.com' },
7	to: [{ email: 'sarah.davis@example.com', name: 'Sarah Davis' }],
8	};

1	import { BrevoClient, logging } from '@getbrevo/brevo';
2
3	const brevo = new BrevoClient({
4	apiKey: 'your-api-key',
5	logging: {
6	level: logging.LogLevel.Debug,
7	logger: new logging.ConsoleLogger(),
8	},
9	});

1	import winston from 'winston';
2	import { logging } from '@getbrevo/brevo';
3
4	const winstonLogger = winston.createLogger({
5	level: 'info',
6	format: winston.format.json(),
7	transports: [new winston.transports.Console()],
8	});
9
10	const logger: logging.ILogger = {
11	debug: (msg, ...args) => winstonLogger.debug(msg, ...args),
12	info: (msg, ...args) => winstonLogger.info(msg, ...args),
13	warn: (msg, ...args) => winstonLogger.warn(msg, ...args),
14	error: (msg, ...args) => winstonLogger.error(msg, ...args),
15	};
16
17	const brevo = new BrevoClient({
18	apiKey: 'your-api-key',
19	logging: { level: logging.LogLevel.Debug, logger },
20	});

1	const brevo = new BrevoClient({
2	apiKey: 'your-api-key',
3	fetch: async (url, options) => {
4	console.log('→', url);
5	const response = await fetch(url, options);
6	console.log('←', response.status);
7	return response;
8	},
9	});

1	import fetch from 'node-fetch';
2
3	const brevo = new BrevoClient({
4	apiKey: 'your-api-key',
5	fetch: fetch as typeof globalThis.fetch,
6	});

1	import { fetch } from 'undici';
2
3	const brevo = new BrevoClient({
4	apiKey: 'your-api-key',
5	fetch: fetch as typeof globalThis.fetch,
6	});

1	// v3.x
2	import { TransactionalEmailsApi, SendSmtpEmail } from '@getbrevo/brevo';
3
4	let emailAPI = new TransactionalEmailsApi();
5	(emailAPI as any).authentications.apiKey.apiKey = 'xkeysib-xxx';
6
7	let message = new SendSmtpEmail();
8	message.subject = 'First email';
9	message.textContent = 'Hello world!';
10	message.sender = { name: 'Bob Wilson', email: 'bob.wilson@brevo.com' };
11	message.to = [{ email: 'sarah.davis@example.com', name: 'Sarah Davis' }];
12
13	emailAPI.sendTransacEmail(message);

Overview

Requirements

Installation

Quick start

Configuration

Constructor options

Error handling

Error classes

Retries

Retry behavior

Timeouts

Recommended timeout values

Request options

Abort signal

Raw response

Binary responses

Saving binary content

Node.js (ReadableStream)

Bun

Browser

TypeScript types

Logging

Custom logger

Custom fetch

Common integrations

node-fetch

undici

With request ID header

Available services

Migration from v3.x

Key changes

Migration example

Resources

Overview

Requirements

Installation

Quick start

Configuration

Constructor options

Error handling

Error classes

Retries

Retry behavior

Timeouts

Recommended timeout values

Request options

Abort signal

Raw response

Binary responses

Saving binary content

Node.js (ReadableStream)

Bun

Browser

TypeScript types

Logging

Custom logger

Custom fetch

Common integrations

node-fetch

undici

With request ID header

Available services

Migration from v3.x

Key changes

Migration example

Resources