---
id: sse-starlette
version: "3.4.8"
license: BSD-3-Clause
license_treatment: permissive
maintenance: active
---

# sse-starlette — SSE plugin for Starlette

License: permissive · Maintenance: active · Popularity: top 1,000 on PyPI

## Install

pip install sse-starlette
uv add sse-starlette
poetry add sse-starlette

## Description

# Server-Sent Events for [Starlette](https://github.com/encode/starlette) and [FastAPI](https://fastapi.tiangolo.com/)

[![Downloads](https://static.pepy.tech/badge/sse-starlette/week)](https://pepy.tech/project/sse-starlette)
[![PyPI Version][pypi-image]][pypi-url]
[![Build Status][build-image]][build-url]

> Background: https://sysid.github.io/server-sent-events/

Production ready Server-Sent Events implementation for Starlette and FastAPI following the [W3C SSE specification](https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events).

## Installation

```bash
pip install sse-starlette
uv add sse-starlette

# To run the examples (fastapi, uvicorn, pydantic)
uv add sse-starlette[examples]

# Example 03 also needs the DB extras (sqlalchemy, aiosqlite)
uv add sse-starlette[examples,examples-db]

# Recommended ASGI server
uv add sse-starlette[uvicorn,granian,daphne]
```

## Quick Start

```python
import asyncio
from starlette.applications import Starlette
from starlette.routing import Route
from sse_starlette import EventSourceResponse

async def generate_events():
    for i in range(10):
        yield {"data": f"Event {i}"}
        await asyncio.sleep(1)

async def...

## AI interpretation — verify before relying

Provides Server-Sent Events (SSE) streaming for Starlette and FastAPI applications, following the W3C SSE specification with async/await support, automatic client disconnect detection, and graceful shutdown handling.

Verdict: sse-starlette is a production-ready, actively maintained SSE implementation for Starlette and FastAPI with no known vulnerabilities. Low install friction, permissive licensing, and comprehensive async features (graceful shutdown, multi-threaded support, memory channels) make it a solid choice for real-time streaming in modern Python web applications.

[View on SkillFed](https://skillfed.io/packages/sse-starlette) · [View on PyPI](https://pypi.org/project/sse-starlette/)