fakeredis 2.37.0

Python implementation of redis API, can be used for testing purposes.

A fast, pure-Python implementation of the Redis protocol — no server required.

Documentation · Supported commands · Changelog · Sponsor

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fakeredis is a drop-in replacement for redis-py and valkey-py that runs entirely in-memory. Write tests that depend on Redis, Valkey, DragonflyDB, or KeyDB — without spinning up a real server, a container, or a network connection.

import fakeredis

r = fakeredis.FakeStrictRedis()
r.set("foo", "bar")
r.get("foo")  # b'bar'

That's it. No server to install, no port to manage, no teardown.

✨ Why fakeredis?

• 🚀 Zero setup — no Redis server, Docker, or network required. Pure Python.
• 🔌 Drop-in compatible — same API as redis.Redis and redis.asyncio.Redis.
• ⚡ Fast & isolated — in-memory, so tests run quickly and start from a clean slate.
• 🧩 Multi-backend — emulate Redis, Valkey, DragonflyDB, or KeyDB, and pin a specific server version.
• 📦 Redis Stack support — JSON, Bloom/Cuckoo filters, TimeSeries, and Geo commands.
• 🤝 Share or isolate state — one shared in-memory server across clients, or independent servers per test.

📥 Installation

pip install fakeredis

Optional extras enable additional command families:

pip install "fakeredis[lua]"          # EVAL / EVALSHA scripting
pip install "fakeredis[json]"         # JSON.* commands
pip install "fakeredis[bf]"           # Bloom / Cuckoo / Count-Min / Top-K filters
pip install "fakeredis[probabilistic]"  # alias for the probabilistic filters
pip install "fakeredis[valkey]"       # Valkey client compatibility

🚀 Quickstart

Use it like redis.Redis:

import fakeredis

r = fakeredis.FakeStrictRedis()
r.lpush("queue", "a", "b", "c")
r.lrange("queue", 0, -1)  # [b'c', b'b', b'a']

Share one in-memory server between clients:

server = fakeredis.FakeServer()
r1 = fakeredis.FakeStrictRedis(server=server)
r2 = fakeredis.FakeStrictRedis(server=server)

r1.set("greeting", "hello")
r2.get("greeting")  # b'hello' — same underlying data

Async is supported too:

import fakeredis

async def main():
    r = fakeredis.FakeAsyncRedis()
    await r.set("foo", "bar")
    await r.get("foo")  # b'bar'

Pin a server type and version:

# Behave like Redis 6...
r = fakeredis.FakeStrictRedis(version=6)
# ...or like Valkey
r = fakeredis.FakeStrictRedis(server_type="valkey")

Using it in tests (pytest)

import pytest
import fakeredis

@pytest.fixture
def redis_client():
    return fakeredis.FakeStrictRedis()

def test_cache_set(redis_client):
    redis_client.set("user:1", "alice")
    assert redis_client.get("user:1") == b"alice"

See the official documentation for the full list of supported commands and configuration options.

❤️ Sponsor

fakeredis-py is developed and maintained for free. If it saves you time, please consider becoming a sponsor — it directly supports continued development.

🤝 Contributing

Contributions are welcome! Check out the contributing guide and the open issues to get started.