file-type-mime

import { parse } from "file-type-mime"; import { readFileSync, existsSync } from "node:fs"; import { resolve } from "node:path"; // Create a dummy PDF file for demonstration if it doesn't exist const dummyFilePath = resolve("./dummy.pdf"); if (!existsSync(dummyFilePath)) { // In a real scenario, you'd have an actual file. This is just for a runnable example. // For simplicity, we'll create a minimal valid PDF header. // This won't be a full PDF, but enough to be detected by some tools. const dummyPdfContent = Buffer.from('%PDF-1.4\n1 0 obj<</Type/Catalog/Pages 2 0 R>>endobj\n2 0 obj<</Type/Pages/Count 0>>endobj\nxref\n0 3\n0000000000 65535 f\n0000000009 00000 n\n0000000057 00000 n\ntrailer<</Size 3/Root 1 0 R>>startxref\n106\n%%EOF'); // For actual testing, replace with a real PDF or path to one. // require('node:fs').writeFileSync(dummyFilePath, dummyPdfContent); // For this runnable example, we'll just use a direct buffer. console.log('No dummy.pdf found. Using a synthetic buffer for demonstration.'); } // Simulate reading a file buffer (replace with actual file path if desired) const fileBuffer = Buffer.from('%PDF-1.4\n1 0 obj<</Type/Catalog/Pages 2 0 R>>endobj\n2 0 obj<</Type/Pages/Count 0>>endobj\nxref\n0 3\n0000000000 65535 f\n0000000009 00000 n\n0000000057 00000 n\ntrailer<</Size 3/Root 1 0 R>>startxref\n106\n%%EOF'); // Example PDF header const result = parse(fileBuffer.buffer); // Pass ArrayBuffer from Node.js Buffer if (result) { console.log(`Detected MIME Type: ${result.mime}`); console.log(`Detected File Extension: ${result.ext}`); } else { console.log('Could not detect file type.'); } // Example with `extra` option for text/plain const textBuffer = Buffer.from('This is a plain text file.'); const textResult = parse(textBuffer.buffer, { extra: true }); if (textResult) { console.log(`\nDetected MIME Type (with extra): ${textResult.mime}`); } else { console.log('Could not detect text file type with extra option.'); }