In-Memory Backend

The InMemoryBackend is the simplest backend for FastAPI Cachekit.
It stores all cached data in the application's memory, making it ideal for local development, testing, or small-scale deployments.

🚀 Installation

No extra dependencies are required!
The in-memory backend is built-in and works out of the box.

pip install fastapi-cachekit

⚙️ Setup with FastAPI

from fast_cache import FastAPICache, InMemoryBackend

cache = FastAPICache()
backend = InMemoryBackend(namespace="myapp-cache")
cache.init_app(app, backend)

namespace (optional): Prefix for all cache keys (default: "fastapi-cache").

🧑‍💻 Example Usage

@app.get("/expensive")
@cache.cached(expire=60)
async def expensive_operation(x: int):
    # This result will be cached in memory for 60 seconds
    return {"result": x * 2}

📝 Options

namespace:
A string prefix for all cache keys. Useful if you run multiple apps in the same process.
max_size (optional):
Maximum number of items to store in the cache.
If set, the cache will evict the least recently used (LRU) items when full.

backend = InMemoryBackend(namespace="myapp-cache", max_size=1000)

⚠️ Limitations

Not shared between processes or servers:
Each process has its own cache. Not suitable for distributed or multi-worker deployments.
Data is lost on restart:
The cache is cleared when the app restarts.
Best for development, testing, or single-process apps.