Publish Python 3.13 FastAPI JWT Bcrypt Fix Guide

README.md

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+---
+license: mit
+tags:
+  - fastapi
+  - python-3.13
+  - bcrypt
+  - passlib
+  - jwt-authentication
+---
+
+# 🛡️ Fixing `ValueError: password cannot be longer than 72 bytes` in Python 3.12 / 3.13 (`passlib` + `bcrypt`)
+
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+
+When deploying **FastAPI** authentication routes using `passlib[bcrypt]` on **Python 3.12 or Python 3.13**, newer versions of `bcrypt` (`>= 4.1.0`) raise:
+```text
+ValueError: password cannot be longer than 72 bytes, truncate manually if necessary
+```
+during `passlib`'s internal `detect_wrap_bug` startup check.
+
+## ✅ The Instant Production Fix
+
+Pin `bcrypt==4.0.1` alongside `passlib[bcrypt]` in your `requirements.txt`:
+
+```txt
+fastapi
+uvicorn
+passlib[bcrypt]
+bcrypt==4.0.1
+python-jose[cryptography]
+pydantic[email]
+```
+
+---
+
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