Life & fun · alternatives · 2026

Iroh is a JavaScript library that enables dynamic analysis by patching code to record and intercept runtime behavior without modifying the original program. Developers can add listeners to track and manipulate function… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. A library to record and intercept JavaScript at runtime launched in 2017; newer entries below may have overtaken it.

1. 1
   Iroh – Analyze JavaScript at Runtime▲6

   Dynamic code analysis tool - Exploit, record and analyze running JavaScript - maierfelix/Iroh

   2017 · github.com · its alternatives →

2. 2OA
   OxJS - a JavaScript Library for Web Applications▲44

   2012 · oxjs.org · its alternatives →

3. 3
   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 →

4. 4
   Open source JavaScript library to record and replay the web▲353

   Embeddable session replay infrastructure on rrweb, the open source standard. Unbranded SDK, ingest on your domain, replay through your API. Free tier included.

   2018 · rrweb.io · its alternatives →

5. 5
   1 KB JavaScript library for building front end apps▲242

   1kB-ish JavaScript framework for building hypertext applications - hyperapp/hyperapp

   2017 · github.com · its alternatives →

6. 6
   A Chrome extension that tracks front-end JavaScript at runtime▲95

   A chrome extension tracks front-end JavaScript that uses DOM / jQuery APIs to manipulate html dom elements (e.g., change style, attach event listener) at runtime. - pilagod/js-tracker

   2018 · github.com · its alternatives →

7. 7
   Runabout▲90

   Instantly reproduce scenarios in your code

   2023 · plugins.jetbrains.com · its alternatives →

8. 8
   Duktape-eval – a eval library built on Duktape and WebAssembly▲41

   A safe eval library based on WebAssembly and Duktape/QuickJS. - maple3142/wasm-jseval

   2020 · github.com · its alternatives →

9. 9
   QuickBEAM – run JavaScript as supervised Erlang/OTP processes▲113

   QuickBEAM is a JavaScript runtime embedded inside the Erlang/OTP VM. If you’re building a full-stack app, JavaScript tends to leak in anyway — frontend, SSR, or third-party code. QuickBEAM runs that JavaScript inside OTP supervision trees. Each runtime is a process with a `Beam` global that can: - call Elixir code - send/receive messages - spawn and monitor processes - inspect runtime/system state It also provides browser-style APIs backed by OTP/native primitives (fetch, WebSocket, Worker, BroadcastChannel, localStorage, native DOM, etc.). This makes it usable for: - SSR…

   Mar 2026 · github.com · its alternatives →

10. 10
    Danfo.js▲109

    Open Source JavaScript library for manipulating data.

    2020 · github.com · its alternatives →

11. 11CJ
    Chardin.js, beautiful instructions for apps▲203

    2013 · heelhook.github.com · its alternatives →

12. 12
    1kb JavaScript library for building front end applications▲187

    1kB-ish JavaScript framework for building hypertext applications - hyperapp/hyperapp

    2017 · github.com · its alternatives →

13. 13
    A tiny and fast reactive observables library via functions▲72

    A tiny (~1kB minzipped) and extremely fast library for creating reactive observables via functions. - maverick-js/signals

    2022 · github.com · its alternatives →

14. 14SU
    Speeding up the code-test cycle for Java developers▲69

    Hello HN, I am Parth. In my experience, the current form of testing automation takes too long. To solve this, I am creating a developer tool to speed up the code-test cycle for Java developers. It has two main parts: Direct Invoke - lets you call any Java function directly, without the need to execute the whole call hierarchy. (e.g. an HTTP endpoint) In my normal coding workflow, I use the “Evaluate Expression” feature inside IntelliJ IDE. I usually put a breakpoint somewhere in the code and after hitting the breakpoint by calling an HTTP api, let the execution remain paused while I explore…

    2023 · its alternatives →

15. 15
    Instant API – Build type-safe web APIs with JavaScript▲102

    Hey there HN! I just wrapped up an all-day documentation spree for Instant API, a JavaScript framework for easily building web APIs that implements type safety at the HTTP interface. It uses a function-as-a-service approach combined with a slightly modified JSDoc spec to automatically enforce parameter and schema validation before HTTP requests make it through to your code. You just write comments above your endpoint functions and voila, enforced type safety contracts between your API endpoints and your developers. OpenAPI specifications are generated automatically as a byproduct of simply…

    2023 · github.com · its alternatives →

16. 16AJ
    A Javascript library to overcomplicate Five▲69

    2014 · jackdcrawford.github.io · its alternatives →

17. 17
    Spall – WASM-based profiler for JavaScript and C and Odin▲83

    [I'm the author] Spall is a web-accessible profiler that I made to help my web-dev friends load gigabyte+ JSON traces without lunch-break-long load times. Recently, Spall got experimental support for auto-tracing with binary traces (along with an in-progress native-port, to give it more memory headroom), which was used to help track down and fix some hard-to-spot lock contention issues in the Odin-language compiler. I demoed it at the Handmade Seattle conference in October, https://guide.handmade-seattle.com/c/2022/spall/, with a head-to-head against Perfetto,…

    2023 · gravitymoth.com · its alternatives →

18. 18
    Miso – A Haskell implementation of Elm▲114

    :ramen: A tasty Haskell web and mobile framework. Contribute to dmjio/miso development by creating an account on GitHub.

    2017 · github.com · its alternatives →

19. 19
    Arrow JavaScript, Reactivity Without the Framework▲32

    A tiny ~2kb library for building reactive interfaces in native JavaScript

    2025 · arrow-js.com · its alternatives →

20. 20
    An experimental data-flow analysis tool for JavaScript▲95

    Find the origin of any character in the DOM

    2019 · fromjs.com · its alternatives →

21. 21
    a tool for inspecting HTTP callbacks in realtime▲21

    2013 · webhookinbox.com · its alternatives →

22. 22AM
    A minimal TS library that generates prompt injection attacks▲33

    I made an open source, MIT license Typescript library based on some of the latest research that generates prompt injection attacks. It is a super minimal/lightweight and designed to be super easy to use. Keen to hear your thoughts and please be responsible and only pen test systems where you have permission to pen test!

    2025 · prompt-injector.blueprintlab.io · its alternatives →

23. 23LA
    LemonadeJS – A micro JavaScript library for building web interfaces▲57

    Reactive components with React-like patterns at ~9 KB gzip. Zero dependencies, zero build step, designed for humans and AI agents.

    2021 · lemonadejs.net · its alternatives →

24. 24
    Kyushu – A self-hostable WASM sandbox for JavaScript workers▲89

    A self-hostable Wasm sandbox for JavaScript workers.

    Jun 2026 · kyushu.dev · 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 →