Why File Type Detection Is More Than a Metadata Problem
What Magika teaches us about names, evidence, boundaries, and trustworthy file intelligence
Author note: This article is written for engineers building upload flows, storage systems, CI pipelines, security tooling, and AI products that need to reason about real files instead of just trusting filenames.
Summary
When a system accepts a file, one of the first questions sounds almost trivial:
What is this thing?
But many production systems still answer that question with a weak proxy:
- the filename extension
- the browser-provided MIME type
- a user claim
- a storage metadata field
That works until it does not.
A file called invoice.pdf may actually be a ZIP container, a JavaScript payload, a damaged document, or a binary blob that should never reach the parser you are about to invoke.
This is why Google's open-source Magika project is interesting.
Magika is not just another convenience wrapper around file metadata. It is a content-based file...
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