# Hono v4.13.3

- Product: Hono (https://whatsnew.fyi/product/hono)
- Vendor: Hono
- Date: 2026-08-18
- Version: v4.13.3
- Original notes: https://github.com/honojs/hono/releases/tag/v4.13.3
- Permalink: https://whatsnew.fyi/product/hono/releases/v4.13.3

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **fixed** — Prevent URL corruption when replaceUrlParam contains $ replacement tokens
- **fixed** — Copy pending stream bytes in etag
- **fixed** — Avoid skipping headers when filtering 304 response headers in etag
- **fixed** — Append Origin to Vary header on OPTIONS preflight in cors
- **fixed** — Match suffix wildcard routes in trie-router
- **fixed** — Prevent prefix overmatch on wildcard routes in pattern-router and linear-router
- **fixed** — Exempt OPTIONS request from CSRF validation in csrf
- **fixed** — Avoid truncation on embedded IPv4 addresses in expand IPv6 in utils/ipaddr
- **added** — Support structured JSON content-types (+json) in pretty-json

##### What's Changed

* fix(client): prevent URL corruption when replaceUrlParam contains $ replacement tokens in https://github.com/honojs/hono/pull/5227
* fix(etag): copy pending stream bytes in https://github.com/honojs/hono/pull/5239
* fix(etag): avoid skipping headers when filtering 304 response headers in https://github.com/honojs/hono/pull/5234
* fix(cors): append Origin to Vary header on OPTIONS preflight in https://github.com/honojs/hono/pull/5235
* docs(context): add custom headers append option example to Context JSDoc in https://github.com/honojs/hono/pull/5248
* fix(trie-router): match suffix wildcard routes in https://github.com/honojs/hono/pull/5236
* fix(pattern-router/linear-router): prevent prefix overmatch on wildcard routes in https://github.com/honojs/hono/pull/5252
* fix(csrf): exempt OPTIONS request from CSRF validation in https://github.com/honojs/hono/pull/5250
* fix(utils/ipaddr): avoid truncation on embedded IPv4 addresses in expand IPv6 in https://github.com/honojs/hono/pull/5247
* feat(pretty-json): support structured JSON content-types (+json) in https://github.com/honojs/hono/pull/5226

**Full Changelog**: https://github.com/honojs/hono/compare/v4.13.2...v4.13.3