Category
Clearer Excel Charts in JavaScript: Multi-Level Labels & Dual Axes
2026-09-23 07:30:28
A column chart with regions and months on the same axis has two problems, and they are not the same problem. The first is that the category labels collapse into a single row — "North", "Jan", "North", "Feb" — and the reader has to mentally re-group which month belongs to which region. The second is that when a growth-rate series is added alongside a sales series that runs into the millions, the growth rate becomes a flat line hugging the baseline, because one value axis cannot serve two magnitudes at once.
Reducing PDF File Size: Images, Fonts & Content Streams in JavaScript (React)
2026-09-18 08:16:08
A PDF is rarely just "too big". It is too big for one specific door — a mail attachment cap, an upload form, a storage quota — and whatever pushed it past that limit is usually one of three things. Compressing without knowing which one means guessing, and guessing costs either quality or another failed upload.
Reading and Extracting Excel Formulas in JavaScript (React)
2026-09-18 08:15:27
Somebody built this workbook years ago. It recalculates when the data changes, the totals move in ways nobody predicts any more, and there is no documentation — because the formulas are the documentation. Reading the numbers will not tell you how they were produced. Reading the rules will.
How to Insert Excel Formulas and Functions in JavaScript (React)
2026-09-18 08:14:02
A generated spreadsheet full of pre-computed numbers is a snapshot. It looks right the moment it is produced and starts aging immediately: the data behind it moves on, the numbers inside it do not, and once the file has left your application nobody can tell which cells they are allowed to change. A workbook that carries its formulas instead stays a live document — edit an input, and the totals follow.
How to Convert PDF Pages to Images in JavaScript (React)
2026-09-11 09:55:36
You build a document list for a client, and the client asks: "can I see the pages before downloading?" Just like that, you own a rendering feature you did not plan for. The same request shows up everywhere — a thumbnail strip under an inbox, a preview card pasted into a chat, a slide pulled from a deck and posted to social. In every case a PDF cannot be shown inline, but a picture of its pages can.
Replacing and Removing Images from PDFs in JavaScript (React)
2026-09-11 09:51:17
A PDF you produced last quarter still circulates internally, but its logo was rebranded last month and one chart shows numbers that are no longer true. You don't want to rebuild the document from scratch — you just need to swap the outdated image for the new one, or strip out an obsolete stamp or watermark entirely.
Extract Images from a PDF in JavaScript (React)
2026-09-11 09:46:47
You received a 40-page report and need the eight charts inside it for a slide deck, or you want to pull product photos out of a supplier's catalog. The catch: a PDF stores images in an internal stream format that the browser's built-in APIs can't read, so there is no "right-click, save image" path.
Converting Images to PDF in JavaScript (React)
2026-09-09 09:52:03
A folder of images is awkward to hand to someone. A PDF is one file, opens everywhere, prints predictably, and — the part people actually care about — holds a fixed order. That is why scanned pages, photo sets, receipt photos, and exported design frames so often get assembled into a PDF before they go anywhere.