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Starting points for your own code. Run them in the environment shown below.
Node.js 22+ · ES module (.mjs)
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Install dependencies
npm install mrmimeimport { lookup } from "mrmime";
const extension = "json";
const query = extension === "custom" ? "config.json" : extension;
console.log(lookup(query) ?? "application/octet-stream");Search by extension, filename, or MIME type.
Extension-based mapping, not content sniffing or security validation.
Text 1 MB
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