Security & Code Audit for FastAPI Projects

CodeAudit.dev checks your FastAPI codebase for the vulnerabilities, performance issues, and architecture problems most common to FastAPI applications.

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Common FastAPI Issues

Missing input validation on Pydantic models

Unprotected sensitive endpoints

CORS misconfigurations (e.g., allow_origins=['*'])

Blocking I/O in async routes

Leaking sensitive data in OpenAPI schemas

Improper dependency injection usage

Hardcoded secrets in the application code

Example Finding

[High]

Blocking I/O in Async Route

A synchronous, blocking operation (e.g., reading a large file or a slow synchronous database query) is being performed inside an 'async def' route. This blocks the main thread and halts the entire server.

Fix:Either change the route to a standard 'def' (so FastAPI runs it in a threadpool) or use an asynchronous library for the I/O operation.

Why FastAPI Projects Need Specialized Checks

FastAPI is blazing fast, but mixing synchronous and asynchronous code incorrectly can cause severe performance bottlenecks. Additionally, while Pydantic makes validation easy, developers sometimes skip rigorous constraints or misconfigure CORS and authentication dependencies. CodeAudit ensures your async patterns are correct and your API boundaries are secure.

Frequently Asked Questions

Does it check my Pydantic models?

Yes. We review Pydantic models to ensure they have appropriate constraints and aren't overly permissive.

Can CodeAudit detect OpenAPI schema leaks?

Yes. We flag endpoints that might inadvertently expose sensitive internal structures through the auto-generated docs.

Ready to secure your FastAPI app?

Join the waitlist to get early access to CodeAudit.dev and make sure your code is production-ready.

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