Fix hosted callback 500 from missing join import

[chelojimenez]

Summary

• import join from path in mcpjam-inspector/server/index.ts
• fix hosted SPA fallback for deep links like /callback

Root cause

Production sign-in on app.mcpjam.com redirects to /callback, which goes through the SPA fallback in server/index.ts. That code calls join(...) to load dist/client/index.html, but join was never imported, so the fallback throws at runtime.

Railway logs for the production service show:
Error serving index.html: ReferenceError: join is not defined

Repro

• https://app.mcpjam.com/ returns 200
• https://app.mcpjam.com/callback?code=test returns 500 before this fix
• arbitrary deep links like /foo also return 500 for the same reason

Testing

• verified the production error via Railway logs
• verified the code path uses join(...) without importing it before this change
• did not run a full local build/test pass in this worktree because dependencies are not bootstrapped cleanly here

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Note

Low Risk
Low risk: adds a missing join import to fix a runtime ReferenceError in the production SPA fallback path with no behavior changes beyond preventing 500s on deep links.

Overview
Fixes hosted production deep links (e.g. /callback) returning 500 by importing join from path in mcpjam-inspector/server/index.ts, preventing the SPA fallback index.html loader from throwing ReferenceError: join is not defined.

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[chelojimenez]

✅ Snyk checks have passed. No issues have been found so far.

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[coderabbitai]

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ℹ️ Recent review info

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a1683d3e-23c5-4235-842c-3ce9c4f69a75

📥 Commits

Reviewing files that changed from the base of the PR and between bd5c8b9 and b311afa.

📒 Files selected for processing (1)

• mcpjam-inspector/server/index.ts

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Walkthrough

The path module import in the server index file has been updated to include the join function. This modification adds join to the existing import statement from "path", resulting in a single line addition and removal. The change does not introduce any new functional behavior, as the imported function remains unused in the visible codebase.

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