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Detecting the correct MIME type is critical when processing uploads, generating thumbnails, validating content, or securing your storage pipeline. In Node.js, developers usually choose between two common approaches: file-type library → detect MIME from buffer Linux file command → detect MIME from file path Both methods work well—but not for the same scenarios. This guide shows you the differences, the performance impact, and a best-practice hybrid method using the 5MB rule. ...

🚀 Optimizing Video Uploads: Multipart Upload, Pre-Signed URLs, and S3 Events Uploading big video files is like trying to send a watermelon through a straw 🍉 — it’s slow, clunky, and often ends in frustration. But fear not! With AWS S3, pre-signed URLs, and multipart uploads, we can make uploads as smooth as butter on a warm pancake 🥞. In this post, I’ll show how to: Use Pre-signed URLs for secure direct uploads Enable Multipart Upload for speed and reliability Trigger S3 Events for post-processing And add structured logs to know exactly what’s happening — even when the servers are pretending everything’s fine 😅 🧱 1. Why Pre-Signed URLs? Uploading directly to your backend is like sending every file through one poor server who’s already overworked. Instead, let S3 handle it directly — your server just gives the client a ticket (the pre-signed URL). ...

🧠 Introduction When working with Amazon S3, two common commands developers use are HeadObjectCommand and GetObjectCommand. At first glance, they might seem similar — both retrieve object information — but they serve different purposes. Let’s explore how they differ and when to use each. ⚙️ HeadObjectCommand HeadObjectCommand retrieves only the metadata of an S3 object, without downloading the file content. This is ideal when you just want to: Check if a file exists. Get metadata (like Content-Type, Content-Length, Last-Modified, ETag, etc.). Verify object accessibility or permissions. ✅ Example import { S3Client, HeadObjectCommand } from "@aws-sdk/client-s3"; const s3 = new S3Client({ region: "ap-southeast-1" }); async function checkFileInfo() { try { const command = new HeadObjectCommand({ Bucket: "my-bucket", Key: "example/data.json", }); const response = await s3.send(command); console.log("✅ Object found:", response); } catch (err) { if (err.name === "NotFound") { console.log("❌ Object not found"); } else { console.error("⚠️ Error:", err); } } } checkFileInfo(); 💡 Output (sample) { "AcceptRanges": "bytes", "LastModified": "2025-10-31T02:45:10.000Z", "ContentLength": 24987, "ContentType": "application/json", "ETag": "\"d41d8cd98f00b204e9800998ecf8427e\"" } 👉 No file data is returned — only metadata. ...

When you watch a crisp 4K video online, it’s easy to forget how much math, motion analysis, and trickery are happening behind the scenes. Every second of video is a negotiation between bits, motion, and your eyes — and the deal is never perfect. 🎞️ The Real Job of a Codec A video codec (like H.264, HEVC, or AV1) doesn’t just compress video — it tries to predict what your eyes will notice. It keeps what’s important and throws away what you probably won’t see. ...

Have you ever uploaded a file and the browser didn’t open it correctly — maybe it downloaded instead of showing up on the screen? That usually happens because of something called a MIME type. 🧠 What Is a MIME Type? A MIME type (short for Multipurpose Internet Mail Extensions) tells the browser what kind of file it’s dealing with. For example: File Type MIME Type Extension HTML page text/html .html CSS file text/css .css JavaScript file application/javascript .js JPEG image image/jpeg .jpg, .jpeg PDF document application/pdf .pdf Word document application/vnd.openxmlformats-officedocument.wordprocessingml.document .docx When your web server sends a file, it includes a header like this: ...