Dev tools · alternatives · 2026

24 alternatives to js.spec, a JavaScript implementation of clojure.spec

clojure.spec for Javascript. Contribute to prayerslayer/js.spec development by creating an account on GitHub.

js.spec is a JavaScript library that brings Clojure's spec system to JavaScript. It enables developers to define specifications for data structures and functions, then validate them at runtime. The tool is designed for… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. js.spec, a JavaScript implementation of clojure.spec launched in 2016; newer entries below may have overtaken it.

1. 1
   Pts.js – A library for visualization and creative coding▲611

   Pts is a javascript library for visualization and creative-coding.

   2018 · ptsjs.org · its alternatives →

2. 2
   SpeckJS – Comment Driven Development▲16

   2015 · speckjs.github.io · its alternatives →

3. 3TJ
   Textures.js, SVG Patterns for Data Visualization▲404

   A JavaScript Library for creating SVG patterns

   2015 · riccardoscalco.github.io · its alternatives →

4. 4AI
   An Isomorphic JavaScript Framework Faster Than React▲337

   2015 · jsblocks.com · its alternatives →

5. 5CP
   Clojure parser and core library in JavaScript, live on CodeCombat▲57

   2014 · vickychijwani.github.io · its alternatives →

6. 6
   CLJS Fiddle – ClojureScript▲82

   A private, browser-only ClojureScript playground powered by the self-hosted compiler.

   2016 · cljsfiddle.com · its alternatives →

7. 7
   Fast.js – faster reimplementations of native JavaScript functions▲323

   Faster user-land reimplementations for several common builtin native JavaScript functions. - codemix/fast.js

   2014 · github.com · its alternatives →

8. 8
   Chart.js▲263

   Simple, clean & engaging charts for designers and developers

   2014 · chartjs.org · its alternatives →

9. 9
   Nothing.js – A chainable mock object which always returns itself▲89

   A chainable, callable mock object which always returns itself - slmgc/Nothing

   2018 · github.com · its alternatives →

10. 10
    Grasp – grep Clojure code using clojure.spec regexes▲123

    Grep Clojure code using clojure.spec regexes. Contribute to borkdude/grasp development by creating an account on GitHub.

    2020 · github.com · its alternatives →

11. 11CD
    Clojure DSL for pattern-matching, parsing and generic programming▲204

    2012 · scattered-thoughts.net · its alternatives →

12. 12
    Execute JavaScript in a WebAssembly QuickJS sandbox▲206

    This TypeScript package allows you to safely execute JavaScript code within a WebAssembly sandbox using the QuickJS engine. Perfect for isolating and running untrusted code securely, it leverages the lightweight and fast QuickJS engine compiled to WebAssembly, providing a robust environment for code execution. Features - *Security*: Run untrusted JavaScript code in a safe, isolated environment. - *File System*: Can mount a virtual file system - *Custom Node Modules*: Custom node modules are mountable - *Fetch Client*: Can provide a fetch client to make http(s) calls - *Test-Runner*: Includes…

    2024 · github.com · its alternatives →

13. 13
    multimethod.js - a Clojure-inspired multimethod library for JavaScript▲49

    ## What is a multimethod?

    2011 · krisjordan.com · its alternatives →

14. 14
    Faster.js – a micro-optimizing JavaScript compiler▲89

    faster.js is a Babel plugin that compiles idiomatic Javascript to faster, micro-optimized Javascript. - vzhou842/faster.js

    2018 · github.com · its alternatives →

15. 15VJ
    validate.js - lightweight JavaScript form validation library▲102

    2011 · rickharrison.github.com · its alternatives →

16. 16
    NotebookJS▲109

    Scientific computation for JavaScript

    2016 · datazar.com · its alternatives →

17. 17
    Mitata – Benchmarking tooling for JavaScript▲93

    I always had a sweet tooth for how easy it is to use google/benchmark, but when working with js, current libraries didn't feel right and some were not even accurate enough, so I decided to create my own library to make JavaScript benchmarking tooling better. With more free time, I finally implemented all features I wished for in 1.0.0 and made a lightweight C++ single-header version for moments when google/benchmark is too much. Hope this library helps you as much as it does me.

    2024 · github.com · its alternatives →

18. 18
    Theory.js – Abstraction layer for cross-platform JavaScript▲28

    Abstraction layer for cross platform JavaScript. Contribute to amark/theory development by creating an account on GitHub.

    2013 · github.com · its alternatives →

19. 19
    Mastering Modular JavaScript▲94

    📦 Module thinking, principles, design patterns and best practices. - mjavascript/mastering-modular-javascript

    2018 · github.com · its alternatives →

20. 20
    Matches.js -- Powerful Pattern Matching for Javascript▲96

    Powerful pattern matching for Javascript. Contribute to natefaubion/matches.js development by creating an account on GitHub.

    2012 · github.com · its alternatives →

21. 21CJ
    CMS.js – Fully Client-Side JavaScript Site Generator▲117

    2016 · cdmedia.github.io · its alternatives →

22. 22
    JavaScript port of Scientist library for refactoring critical paths▲34

    :microscope: A JavaScript interpretation of the Ruby library Scientist, a library for carefully refactoring critical paths. - bugthesystem/scientist.js

    2016 · github.com · its alternatives →

23. 23JP
    JavaScript Program Synthesis▲139

    2021 · grgv.xyz · its alternatives →

24. 24
    CalDOM: An agnostic, reactive and minimalist JavaScript UI library▲107

    An agnostic, reactive & minimalist (3kb) JavaScript UI library with direct access to native DOM.

    2021 · caldom.org · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →