sprintf.js – String Formatting Library for JavaScript

sprintf.js is a lightweight JavaScript library that brings familiar sprintf-style string formatting to both browser and Node.js environments. Compatible with traditional C and PHP formatting syntax, it extends the classic sprintf API with positional and named placeholders, configurable formatting behavior, JSON serialization, placeholder analysis, and reusable formatting configurations, making it suitable for modern JavaScript applications.

Key Features

  • Familiar sprintf and vsprintf API
  • Positional, sequential, and named placeholders
  • Nested object and array property access
  • Configurable formatting behavior
  • Placeholder statistics and analysis
  • Reusable configuration objects
  • JSON serialization support
  • Optional computed values
  • Browser and Node.js compatibility

Typical Applications

  • Template-based string generation
  • Logging and diagnostics
  • Console and CLI applications
  • Report generation
  • Localization and internationalization
  • Configuration file generation
  • Data serialization
  • Developer utilities

Installation

Install the latest version from NPM.

npm install @playfulsparkle/sprintf-js

or

yarn add @playfulsparkle/sprintf-js

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