A library of zero-dependency npm modules that each do just one thing, ideal for when bundle size matters.
Just is a modular JavaScript utility library consisting of individual npm packages that each perform a single, specific task without any dependencies. It solves the problem of bundle bloat by allowing developers to import only the exact utilities they need, making it ideal for performance-critical applications where minimizing file size is essential.
JavaScript developers building web applications, particularly Progressive Web Apps (PWAs) or any project where bundle size optimization is a priority. It's also suitable for developers who prefer modular, single-purpose utilities over monolithic libraries.
Developers choose Just over alternatives because it offers a lightweight, dependency-free approach to common utility functions. Unlike larger libraries that bundle many features together, Just allows you to install only the specific functions you need, resulting in significantly smaller bundle sizes and better performance.
A library of dependency-free JavaScript utilities that do just one thing.
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Each utility is a separate, dependency-free npm package, allowing developers to import only what's needed, which significantly reduces bundle bloat for performance-sensitive applications like PWAs.
Compatible with ES5+ environments, including older browsers and Node.js, and provides both ESM and CJS modules without requiring transpilation, ensuring wide applicability.
Includes TypeScript definitions and tests for every utility, offering type safety and better developer experience in TypeScript projects without additional setup.
Following the Unix philosophy, each module focuses on one specific task, making the code predictable, easier to test, and reducing unintended side effects.
With over 70 individual packages, installing and updating utilities can lead to a cluttered package.json, increased maintenance effort, and potential versioning complexities.
Documentation is spread across individual package READMEs, making it harder to discover related utilities or get a cohesive overview compared to monolithic libraries with centralized docs.
Some utilities may lack the depth or configuration options found in larger libraries, and the README doesn't provide performance benchmarks or detailed edge-case handling for all modules.
just is an open-source alternative to the following products:
Underscore.js is the same as Underscore, a JavaScript library offering utility functions for common programming tasks in a functional style.
Lodash is a popular JavaScript utility library that provides consistent, modular functions for common programming tasks like array manipulation, object iteration, and function composition.