# What changed in fast-content-type-parse

> 2 changes in fast-content-type-parse 2 to 4 from its official release notes, upgrade guides and advisories: 1 breaking. Each one cited. Sources checked 2026-10-27. HTML: https://unstale.sh/npm/fast-content-type-parse/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## fast-content-type-parse 4

### Breaking changes

- Parsing now strictly implements the RFC 9110 media-type grammar, which may affect which media-type strings are accepted. (4.0.0) — [release notes](https://github.com/fastify/fast-content-type-parse/releases/tag/v4.0.0)

## fast-content-type-parse 2

### Behavior and default changes

- The package explicitly declares its JavaScript module type, affecting how JavaScript files are interpreted. (2.0.0) — [release notes](https://github.com/fastify/fast-content-type-parse/releases/tag/v2.0.0)