feat(hono): Add Frontend API proxy support

[brkalow]

Description

Adds Frontend API proxy support to the Clerk Hono middleware, enabling request interception and forwarding to Clerk's Frontend API when direct client-to-Clerk communication is blocked.

Key features:

• FrontendApiProxyOptions interface with boolean or function-based enabling
• Early proxy interception before authentication
• Auto-derivation of proxyUrl from middleware configuration
• Complete test coverage for all proxy scenarios

Testing: All new functionality is covered by 6 test cases validating default/custom paths, enable/disable logic, function-based enabling, and auto-derivation behavior.

Type of change

• 🌟 New feature

Summary by CodeRabbit

• New Features

  • Frontend API proxy support added to Clerk middleware with configurable enablement and custom path options; proxy URL is auto-derived when needed and integrated into the authentication flow.
  • Public types updated to expose the proxy configuration.

• Tests

  • Added tests covering proxy behavior: default and custom paths, conditional enabling (including function-based), non-matching paths, and interactions with authentication.

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Mar 5, 2026 5:51am

[changeset-bot]

🦋 Changeset detected

Latest commit: f2af2b8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@clerk/hono	Minor

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commit: f2af2b8

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• .changeset/bright-planes-proxy.md

🚧 Files skipped from review as they are similar to previous changes (1)

• .changeset/bright-planes-proxy.md

---

📝 Walkthrough

Walkthrough

Adds Frontend API proxy support to the Hono Clerk middleware via a new frontendApiProxy option on ClerkMiddlewareOptions. Implements early proxy handling that can short-circuit requests matching the proxy path and, when enabled, auto-derives and injects a proxyUrl into authentication calls if not provided. Exports and types updated to include FrontendApiProxyOptions. Tests added to verify default and custom proxy paths, conditional enabling (including function-based), non-matching path behavior, and auto-derived proxyUrl.

Possibly related PRs

• clerk/javascript PR 7602: Adds core Frontend API proxy utilities, types, and proxy behavior consumed by this integration.
• clerk/javascript PR 6119: Changes propagation of proxyUrl in authentication/handshake flows, related to the middleware’s derived proxyUrl.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(hono): Add Frontend API proxy support' clearly and concisely summarizes the main change: adding Frontend API proxy support to the Hono middleware.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[brkalow]

Closing in favor of #7994