elysia-jwt-plugin-singleton

Elysia.js returns 401 Unauthorized for valid JWTs when multiple separate JWT plugin instances exist across route files, preventing one instance from verifying tokens signed by another. A shared singleton JWT pattern aligns token signing and verification across all routes.

Fix JWT authentication errors in your Bun-based Elysia.js API by diagnosing duplicate plugin instances and implementing a shared singleton JWT plugin pattern. This ensures all route files use the same instance for consistent token verification.

Yes, Elysia 1.2 derive cache bugs cause 401 errors on POST routes with body schemas by producing undefined user IDs. Inline verification workarounds and diagnostic steps resolve these token signing and verification mismatches.

The singleton pattern for the Elysia.js JWT plugin involves creating a single shared instance imported across all route files instead of instantiating separate plugins per route. This ensures consistent token signing and verification throughout the application.

Use inline verification workarounds for Elysia JWT 401 errors when protected routes reject valid tokens due to Elysia 1.2 derive cache bugs on POST routes with body schemas. These workarounds bypass derive caching issues that produce undefined user IDs.