Hono 4.13.4

Hono 4.13.4 — Released August 24, 2026. This maintenance release focuses on bug fixes across routing, the JSX/DOM layer, ETag handling, and the type-safe client helpers. It follows v4.13.3 by less than a week and contains no breaking changes.

Overview

v4.13.4 is a stability patch for the edge-native web framework. The core team addressed regressions in request handling and router matching while shaving allocation overhead in the router hot path.

New & Notable Fixes

• Request params — param values are now handled correctly on unmatched requests
• JSX/DOM — previous ref cleanup now runs when a ref prop changes during re-render
• RegExp router — wildcard middleware is correctly associated with matching routes
• ETag — If-None-Match tags with optional whitespace before the comma are matched properly
• Client helpers — undefined header, cookie, query and form-array values are now skipped instead of corrupting requests
• Accept header — wildcard media types and specificity ordering are supported in defaultMatch
• Performance — shared null object creation reduces router allocation overhead

Deprecations & Fixes

No APIs were deprecated or removed in this release. All ten changes are non-breaking fixes targeted at reliability. Contributors include members of the Hono community via PRs 5222 through 5280.

Upgrade Notes

Upgrading from 4.13.3 is seamless. Follow the project's GitHub changelog for the full pull-request list. Hono 4.13.4 is available immediately on your preferred package registry.