gabriel-vasile/mimetype

Health v2 · maintenance only

Adoption not part of the score

2012 stars · 200 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A pure-Go library for detecting MIME types and file extensions from file content using magic numbers. It is goroutine-safe, dependency-free, extensible with custom formats, and can differentiate text from binary files.

Use cases

• detect the mime type of an uploaded file in Go
• validate file uploads by content instead of extension
• get a file extension from raw bytes
• sniff whether a file is text or binary
• detect file type without libmagic or C bindings
• identify document formats like Office files from their signatures

When to choose

• you need content-based file type detection in a Go program
• you want a dependency-free, concurrency-safe alternative to libmagic
• you need to validate uploads whose declared Content-Type may be wrong
• you need to extend detection with custom file formats

When to avoid

• metadata is already available from the protocol, e.g. HTTP or SMTP Content-Type headers
• you need detection of formats whose signatures lie far into large files and cannot afford reading more bytes
• you are not working in Go

Facets

library · maturity stable

parser developer-tools files developer-tools web-development go cross-platform mime-detection magic-numbers file-type-sniffing file-extensions content-type

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