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Documentation Index

Fetch the complete documentation index at: https://docs.lettr.com/llms.txt

Use this file to discover all available pages before exploring further.

Official Lettr SDKs for all major programming languages. Each SDK has a guide to get you sending in minutes — follow the card for your language, then use the API reference for full endpoint details.

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Official SDKs

Node.js

npm install lettr

PHP

composer require lettr/lettr-php

Python

pip install lettr

Go

go get github.com/lettr-com/lettr-go

Rust

cargo add lettr

Java

<dependency>
  <groupId>com.lettr</groupId>
  <artifactId>lettr-java</artifactId>
  <version>1.1.0</version>
</dependency>

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Framework Integrations

Laravel

Official Laravel package

Next.js

Send from Next.js apps

Nuxt

Send from Nuxt apps

Flask

Send from Flask apps

FastAPI

Send from FastAPI apps

Serverless

AWS Lambda, Vercel, Cloudflare

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SDK Features

All SDKs include:
FeatureDescription
Type definitionsFull TypeScript/type hints support
Error handlingStructured error responses
Automatic retriesRetry on transient failures
Webhook verificationBuilt-in signature verification
Rate limitingAutomatic rate limit handling

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Source & Contributing

SDKs are open source on GitHub. Each repository’s README has install notes and a hello-world example; full usage lives in the per-language guides above and the API reference.

Contribution Guide

Learn how to contribute to our SDKs