diff --git a/src/lib/mimeType.js b/src/lib/mimeType.js
new file mode 100644
index 0000000..de9a617
--- /dev/null
+++ b/src/lib/mimeType.js
@@ -0,0 +1,49 @@
+export default ext => ({
+  "aac": "audio/aac",
+  "avif": "image/avif",
+  "avi": "video/x-msvideo",
+  "bin": "application/octet-stream",
+  "bmp": "image/bmp",
+  "css": "text/css",
+  "csv": "text/csv",
+  "gz": "application/gzip",
+  "gif": "image/gif",
+  "htm": "text/html",
+  "html": "text/html",
+  "ico": "image/vnd.microsoft.icon",
+  "jpeg": "image/jpeg",
+  "jpg": "image/jpeg",
+  "js": "text/javascript",
+  "json": "application/json",
+  "jsonld": "application/ld+json",
+  "mid": "audio/midi",
+  "midi": "audio/midi",
+  "mjs": "text/javascript",
+  "mp3": "audio/mpeg",
+  "mp4": "video/mp4",
+  "mpeg": "video/mpeg",
+  "oga": "audio/ogg",
+  "ogv": "video/ogg",
+  "ogx": "application/ogg",
+  "opus": "audio/opus",
+  "otf": "font/otf",
+  "png": "image/png",
+  "pdf": "application/pdf",
+  "rar": "application/vnd.rar",
+  "rtf": "application/rtf",
+  "svg": "image/svg+xml",
+  "tar": "application/x-tar",
+  "tif": "image/tiff",
+  "tiff": "image/tiff",
+  "ttf": "font/ttf",
+  "txt": "text/plain",
+  "wav": "audio/wav",
+  "weba": "audio/webm",
+  "webm": "video/webm",
+  "webp": "image/webp",
+  "woff": "font/woff",
+  "woff2": "font/woff2",
+  "xhtml": "application/xhtml+xml",
+  "xml": "application/xml",
+  "zip": "application/zip"
+})[ext] ?? 'application/octet-stream';
\ No newline at end of file