# Hono v4.12.31

- Product: Hono (https://whatsnew.fyi/product/hono)
- Vendor: Hono
- Date: 2026-07-18
- Version: v4.12.31
- Original notes: https://github.com/honojs/hono/releases/tag/v4.12.31
- Permalink: https://whatsnew.fyi/product/hono/releases/v4.12.31

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'.

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- **fixed** — Reuse cached formData in parseBody()
- **fixed** — Fix multipart boundary mismatch in cloneRawRequest
- **fixed** — Emit retry field when retry is 0 in SSE

##### What's Changed
* test(context): assert case-insensitive header names in response helpers by @yusukebe in https://github.com/honojs/hono/pull/5116
* chore(benchmark): add app.fetch() overhead benchmark by @yusukebe in https://github.com/honojs/hono/pull/5117
* refactor(aws-lambada): remove FIXME in `@ts-expect-error` by @yusukebe in https://github.com/honojs/hono/pull/5130
* fix(utils/body): reuse cached formData in `parseBody()` by @yusukebe in https://github.com/honojs/hono/pull/5131
* fix(request): fix multipart boundary mismatch in `cloneRawRequest` by @yusukebe in https://github.com/honojs/hono/pull/5133
* fix(sse): emit retry feild when retry is `0` by @yusukebe in https://github.com/honojs/hono/pull/5135
* test(validator): fix misspelled identifier in transform type test by @yusukebe in https://github.com/honojs/hono/pull/5136

**Full Changelog**: https://github.com/honojs/hono/compare/v4.12.30...v4.12.31