Exploring Sprintf in the Browser

Sep 4, 2025 javascript php programming

sprintf is an amazing function that doesn’t get enough love. Because of this, I had put together a little tool to explore it in the browser.

The idea was simple: give people a place to explore with sprintf in the browser. However, after showing it to a few people, I learned something interesting: you can’t explore what you don’t know. Do you know sprintf?

That is to say, it has been such a foreign concept to so many devs that they don’t know even how to play around with it. Based on that, I think the exploring tool is not the best solution. It’s been archived.

You can still see it at the GitHub repo.

Here is a screenshot of it.

Basically, as you typed, it would format the string using a javascript version of the same functionality. When it was invalid, it would blur out the formatted string area. When it found operators, it would open a new row below.

Feel free to fork this / copy it, and make your own tool.

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