Codex CLI Practical Scenarios: Fast API Creation with User Auth

Codex CLI in practice: one prompt generates a full FastAPI app with SQLite and auth, debugging from a traceback to root cause, converting sync to async with type hints and tests. Four-step workflow: prototype, iterate, production, maintain - review production code manually.

💡 What You Will Learn

Codex CLI in practice: one prompt generates a full FastAPI app with SQLite and auth, debugging from a traceback to root cause, converting sync to async with type hints and tests. Four-step workflow: p

📜 Table of Contents

• Codex CLI Practical Scenarios
• Fast API creation
• Debugging
• Refactoring
• Workflow

Codex CLI Practical Scenarios

Fast API creation

> Create a FastAPI app with SQLite and user auth

Codex generates the full project structure, installs dependencies, and starts the server.

Debugging

> Here is a traceback: KeyError. Find the root cause

Codex analyzes the code and fixes the bug.

Refactoring

> Convert this module from sync to async
> Add type hints
> Write unit tests

Workflow

1. Prototype: Codex generates initial code
2. Iterate: Add features one by one
3. Production: Codex writes tests and docs
4. Maintain: Codex fixes bugs Best for rapid prototyping. Review production code manually.