alexei/sprintf.js

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

2139 stars · 283 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

sprintf.js is a complete open source JavaScript implementation of the classic sprintf string formatting function, usable in both the browser and Node.js. It supports argument indexing, padding, alignment, precision, and other printf-style format specifiers via sprintf and vsprintf APIs.

Use cases

• format strings with printf-style placeholders in javascript
• sprintf implementation for node.js
• format numbers with padding and precision in the browser
• interpolate arguments into a format string by position
• vsprintf formatting from an array of arguments

When to choose

• you need C-style sprintf formatting in JavaScript
• you want a small, dependency-free formatting library for browser or Node.js
• you need argument swapping, padding, alignment, or precision specifiers

When to avoid

• you only need simple template literals or string interpolation
• you need locale-aware number or date formatting (use Intl instead)
• you target very old environments without polyfills

Facets

library · maturity stable

serialization developer-tools developer-tools web-development frontend browser cross-platform string-formatting sprintf printf formatting javascript nodejs

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