---
title: "Discussion on \"Clerk JWT 401 on the server? Check these 3 env vars first\" | Hashnode"
description: "Discussion on \"Clerk JWT 401 on the server? Check these 3 env vars first\". A narrow Clerk auth bug: server-side JWT verification can fail with 401 when your publishable key, secret key, and issuer come from different Clerk instances."
url: "https://hashnode.com/posts/clerk-jwt-401-on-the-server-check-these-3-env-vars-first/6a283f3125e2d48cbde3e770"
---

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# [Clerk JWT 401 on the server? Check these 3 env vars first](https://fetchsandbox.hashnode.dev/clerk-jwt-401-on-the-server-check-these-3-env-vars-first?utm_source=hashnode&utm_medium=feed)

A narrow Clerk auth bug: server-side JWT verification can fail with 401 when your publishable key, secret key, and issuer come from different Clerk instances.

Jun 9 · 2 min read · fetchsandbox.hashnode.dev  
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-   [#clerkdev](https://hashnode.com/tag/clerkdev)
-   [#clerk](https://hashnode.com/tag/clerk)
-   [#jwt](https://hashnode.com/tag/jwt)
-   [#webdev](https://hashnode.com/tag/webdev)
-   [#apis](https://hashnode.com/tag/apis)
-   [#fetchsandbox](https://hashnode.com/tag/fetchsandbox)

## Written by

[Raj Nagulapalle](https://hashnode.com/@fetchsandbox)

@fetchsandbox · San Jose, USA

  
[View profile](https://hashnode.com/@fetchsandbox)

Building tools for API integration testing. Creator of fetchsandbox.com

Engineer who's spent too long debugging webhook signatures and flaky staging servers. Building FetchSandbox — turn any OpenAPI spec into a stateful API sandbox in seconds.

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