https://hthanh12.github.io/posts/Recent content in Posts on hthanh12's blogHugo -- 0.152.2en-usSat, 22 Nov 2025 01:02:36 +0700https://hthanh12.github.io/posts/detect-mimetype/Sat, 22 Nov 2025 01:02:36 +0700https://hthanh12.github.io/posts/detect-mimetype/<p>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:</p> <ol> <li><strong><code>file-type</code> library</strong> → detect MIME from <strong>buffer</strong></li> <li><strong>Linux <code>file</code> command</strong> → detect MIME from <strong>file path</strong></li> </ol> <p>Both methods work well—but <em>not</em> for the same scenarios.<br> This guide shows you the differences, the performance impact, and a <strong>best-practice hybrid method using the 5MB rule</strong>.</p>https://hthanh12.github.io/posts/upload-video/Fri, 07 Nov 2025 22:09:19 +0700https://hthanh12.github.io/posts/upload-video/How to build a scalable, reliable video upload system using AWS S3, pre-signed URLs, multipart uploads, and S3 event triggers — with structured logging best practices (and a sprinkle of developer humor).https://hthanh12.github.io/posts/headobject-vs-getobject/Thu, 06 Nov 2025 23:40:28 +0700https://hthanh12.github.io/posts/headobject-vs-getobject/Understand the difference between HeadObjectCommand and GetObjectCommand in AWS SDK for JavaScript (v3).https://hthanh12.github.io/posts/the-secret-trade-off-in-video/Sun, 02 Nov 2025 16:56:43 +0700https://hthanh12.github.io/posts/the-secret-trade-off-in-video/A deep look at how video codecs balance bits, motion, and human vision.https://hthanh12.github.io/posts/my-first-post/Thu, 30 Oct 2025 16:45:00 +0000https://hthanh12.github.io/posts/my-first-post/<p>Have you ever uploaded a file and the browser didn’t open it correctly — maybe it downloaded instead of showing up on the screen?<br> That usually happens because of something called a <strong>MIME type</strong>.</p> <hr> <h2 id="-what-is-a-mime-type">🧠 What Is a MIME Type?</h2> <p>A <strong>MIME type</strong> (short for <em>Multipurpose Internet Mail Extensions</em>) tells the browser what kind of file it’s dealing with.<br> For example:</p> <table> <thead> <tr> <th>File Type</th> <th>MIME Type</th> <th>Extension</th> </tr> </thead> <tbody> <tr> <td>HTML page</td> <td><code>text/html</code></td> <td><code>.html</code></td> </tr> <tr> <td>CSS file</td> <td><code>text/css</code></td> <td><code>.css</code></td> </tr> <tr> <td>JavaScript file</td> <td><code>application/javascript</code></td> <td><code>.js</code></td> </tr> <tr> <td>JPEG image</td> <td><code>image/jpeg</code></td> <td><code>.jpg</code>, <code>.jpeg</code></td> </tr> <tr> <td>PDF document</td> <td><code>application/pdf</code></td> <td><code>.pdf</code></td> </tr> <tr> <td>Word document</td> <td><code>application/vnd.openxmlformats-officedocument.wordprocessingml.document</code></td> <td><code>.docx</code></td> </tr> </tbody> </table> <p>When your web server sends a file, it includes a header like this:</p>