hatemhosny · Oct 7, 2026 · Oct 7, 2026 · Oct 7, 2026 · Oct 7, 2026
diff --git a/.agents/skills/livecodes/language-support/references/languages.md b/.agents/skills/livecodes/language-support/references/languages.md
@@ -151,6 +151,7 @@ Enabled via `processors` config:
 | Swift (Wasm)                | `swift-wasm`, `swift`, `wasm.swift`                                                 | Swift WASM                                            |
 | Zig (Wasm)                  | `zig-wasm`, `zig`                                                                   | Zig WASM                                              |
 | V (Wasm)                    | `v-wasm`, `v`, `vlang`, `wasm.v`, `vsh`                                             | V compiler in WASM                                    |
+| Janet (Wasm)                | `janet-wasm`, `janet`, `wasm.janet`                                                 | Janet interpreter (WASM)                              |
 | Tcl                         | `tcl`                                                                               | Tcl interpreter                                       |
 | WebAssembly                 | `wat`, `wast`, `wasm`, `webassembly`                                                | WAT format                                            |
 | Assembly (Wasm)             | `assembly-wasm`, `assembly`, `asm`, `asm-wasm`, `x86`, `x86-64`, `nasm`, `wasm.asm` | Keystone + Unicorn (WASM), x86-64 assembly            |

diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ A [feature-rich](https://livecodes.io/docs/features/), open-source, **client-sid
 [![LiveCodes: npm version](https://img.shields.io/npm/v/livecodes)](https://www.npmjs.com/package/livecodes)
 [![LiveCodes: npm downloads](https://img.shields.io/npm/dm/livecodes)](https://www.npmjs.com/package/livecodes)
 [![LiveCodes: jsdelivr downloads](https://data.jsdelivr.com/v1/package/npm/livecodes/badge?style=rounded)](https://www.jsdelivr.com/package/npm/livecodes)
-[![LiveCodes: languages](https://img.shields.io/badge/languages-118-blue)](https://livecodes.io/docs/languages/)
+[![LiveCodes: languages](https://img.shields.io/badge/languages-119-blue)](https://livecodes.io/docs/languages/)
 [![LiveCodes: docs](https://img.shields.io/badge/Documentation-575757?logo=gitbook&logoColor=white)](https://livecodes.io/docs/)
 [![LiveCodes: llms.txt](https://img.shields.io/badge/llms.txt-575757?logo=googledocs&logoColor=white)](https://livecodes.io/docs/llms.txt)
 [![LiveCodes: llms-full.txt](https://img.shields.io/badge/llms--full.txt-575757?logo=googledocs&logoColor=white)](https://livecodes.io/docs/llms-full.txt)

diff --git a/docs/docs/languages/janet-wasm.mdx b/docs/docs/languages/janet-wasm.mdx
@@ -0,0 +1,119 @@
+# Janet (Wasm)
+
+[Janet](https://janet-lang.org/) is a lightweight, embeddable, Lisp-like (Clojure-like), dynamically
+typed programming language.
+
+In LiveCodes, Janet runs in the browser on the Janet interpreter compiled to WebAssembly, entirely
+client-side. No server is involved.
+
+## Usage
+
+Demo:
+
+import LiveCodes from '../../src/components/LiveCodes.tsx';
+
+export const janetConfig = {
+  activeEditor: 'script',
+  script: {
+    language: 'janet-wasm',
+    content: `(print "Hello, World!")`,
+  },
+  mode: 'simple',
+  editor: 'auto',
+  tools: {
+    status: 'full',
+  },
+};
+
+<LiveCodes config={janetConfig}></LiveCodes>
+
+### Standard I/O
+
+The program runs on the [result page](../features/result.mdx). Anything it prints is captured and
+shown in the [console](../features/console.mdx). Standard input is passed by setting the
+`livecodes.janetWasm.input` property in JavaScript before the program runs. It is read in Janet with
+`(file/read stdin :all)` and friends; a program that never reads never notices it was there. To run
+again with new input, call `livecodes.janetWasm.run(input)`.
+
+### Communication with JavaScript
+
+A few helper properties and methods are available in the browser global `livecodes.janetWasm`
+object:
+
+- `livecodes.janetWasm.input`: the standard input passed to the program.
+- `livecodes.janetWasm.loaded`: a promise that resolves when the interpreter has downloaded and the
+  program has run once. It rejects if the runtime fails to load. Other helpers should be used after
+  it resolves.
+- `livecodes.janetWasm.output`: the program's output, standard output and standard error in the
+  order the program wrote them.
+- `livecodes.janetWasm.error`: the interpreter diagnostics, if the program failed.
+- `livecodes.janetWasm.exitCode`: the exit code of the program (`0` ok, `1` runtime error, `2`
+  compile error, `4` parse error).
+- `livecodes.janetWasm.run(input)`: runs the code again with new input, returning a promise that
+  resolves to `{ output, error, exitCode }`.
+
+Example:
+
+<LiveCodes template="janet-wasm" params={{ activeEditor: 'markup' }} height="80vh"></LiveCodes>
+
+## Language Info
+
+### Name
+
+`janet-wasm`
+
+### Aliases / Extensions
+
+`janet`, `wasm.janet`
+
+### Editor
+
+`script`
+
+## Compiler
+
+The [Janet](https://janet-lang.org/) interpreter compiled to WebAssembly (built with Emscripten), packaged by
+[@live-codes/janet-wasm](https://www.npmjs.com/package/@live-codes/janet-wasm).
+
+### Version
+
+Janet 1.42.1.
+
+## Code Formatting
+
+Not currently supported.
+
+## Live Reload
+
+By default, new code changes are sent to the result page for re-evaluation without a full page
+reload, avoiding the need to reload the interpreter. This behavior can be disabled by adding the code
+comment `# __livecodes_reload__` to the Janet code, which forces a full page reload.
+
+This comment can be added in the [`hiddenContent` property of the editor](../configuration/configuration-object.mdx#markup) for embedded playgrounds.
+
+## Example Usage
+
+```janet
+(defn fib [n]
+  (if (< n 2)
+    n
+    (+ (fib (- n 1)) (fib (- n 2)))))
+
+(each n (range 10)
+  (prin (fib n) " "))
+(print)
+```
+
+Each run is independent: definitions from one run do not survive into the next.
+
+## Starter Template
+
+https://livecodes.io/?template=janet-wasm
+
+## Links
+
+- [Janet official website](https://janet-lang.org/)
+- [Janet documentation](https://janet-lang.org/docs/index.html)
+- [Learn X in Y minutes, where X=Janet](https://learnxinyminutes.com/janet/)
+- [Janet for Mortals](https://janet.guide/)
+- [@live-codes/janet-wasm](https://www.npmjs.com/package/@live-codes/janet-wasm)
diff --git a/docs/src/components/LanguageSliders.tsx b/docs/src/components/LanguageSliders.tsx
@@ -80,6 +80,7 @@ export default function Sliders() {
       { name: 'ocaml', title: 'OCaml' },
       { name: 'nim', title: 'Nim' },
       { name: 'nim-wasm', title: 'Nim (Wasm)' },
+      { name: 'janet-wasm', title: 'Janet (Wasm)' },
       { name: 'python', title: 'Python' },
       { name: 'python-wasm', title: 'Python (Wasm)' },
       { name: 'r', title: 'R' },

diff --git a/docs/src/components/TemplateList.tsx b/docs/src/components/TemplateList.tsx
@@ -39,6 +39,7 @@ const templates = [
   { name: 'ocaml', title: 'Ocaml Starter', thumbnail: 'ocaml.svg' },
   { name: 'nim', title: 'Nim Starter', thumbnail: 'nim.svg' },
   { name: 'nim-wasm', title: 'Nim (Wasm) Starter', thumbnail: 'nim.svg' },
+  { name: 'janet-wasm', title: 'Janet (Wasm) Starter', thumbnail: 'janet.png' },
   { name: 'python', title: 'Python Starter', thumbnail: 'python.svg' },
   { name: 'python-wasm', title: 'Python (Wasm) Starter', thumbnail: 'python.svg' },
   { name: 'r', title: 'R Starter', thumbnail: 'r.svg' },

diff --git a/e2e/specs/starter.spec.ts b/e2e/specs/starter.spec.ts
@@ -534,6 +534,32 @@ test.describe('Starter Templates from UI', () => {
     await expect(getResult().locator('h1')).toHaveText('Hello, Nim!');
     await expect(getResult().locator('text=You clicked')).toHaveText('You clicked 3 times.');
   });
+  test('janet-wasm Starter', async ({ page, getTestUrl }) => {
+    // the interpreter (~0.9 MB) is downloaded on the first run
+    test.slow();
+
+    await page.goto(getTestUrl());
+
+    const { app, getResult, waitForResultUpdate } = await getLoadedApp(page);
+
+    await app.click('[aria-label="Project"]');
+    await app.click('text=New');
+    await app.click('text=Janet (Wasm) Starter');
+
+    await waitForEditorFocus(app);
+    await waitForResultUpdate();
+
+    // the counter stays disabled until the interpreter has loaded and run once
+    await expect(getResult().locator('#counter-button')).toBeEnabled({ timeout: 120_000 });
+
+    await getResult().click('text=Click me');
+    await getResult().click('text=Click me');
+    await getResult().click('text=Click me');
+
+    await expect(getResult().locator('h1')).toHaveText('Hello, Janet!');
+    await expect(getResult().locator('text=You clicked')).toHaveText('You clicked 3 times.');
+  });
+
   test('haskell Starter', async ({ page, getTestUrl }) => {
     test.slow();
 
@@ -1320,6 +1346,28 @@ test.describe('Starter Templates from URL', () => {
     await expect(getResult().locator('h1')).toHaveText('Hello, Nim!');
     await expect(getResult().locator('text=You clicked')).toHaveText('You clicked 3 times.');
   });
+  test('janet-wasm Starter (in URL)', async ({ page, getTestUrl }) => {
+    // the interpreter (~0.9 MB) is downloaded on the first run
+    test.slow();
+
+    await page.goto(getTestUrl({ template: 'janet-wasm' }));
+
+    const { app, getResult, waitForResultUpdate } = await getLoadedApp(page);
+
+    await waitForEditorFocus(app);
+    await waitForResultUpdate();
+
+    // the counter stays disabled until the interpreter has loaded and run once
+    await expect(getResult().locator('#counter-button')).toBeEnabled({ timeout: 120_000 });
+
+    await getResult().click('text=Click me');
+    await getResult().click('text=Click me');
+    await getResult().click('text=Click me');
+
+    await expect(getResult().locator('h1')).toHaveText('Hello, Janet!');
+    await expect(getResult().locator('text=You clicked')).toHaveText('You clicked 3 times.');
+  });
+
   test('haskell Starter (in URL)', async ({ page, getTestUrl }) => {
     test.slow();
 

diff --git a/functions/vendors/templates.js b/functions/vendors/templates.js
@@ -39,6 +39,7 @@ export const starterTemplates = {
   "ocaml": "Ocaml Starter",
   "nim": "Nim Starter",
   "nim-wasm": "Nim (Wasm) Starter",
+  "janet-wasm": "Janet (Wasm) Starter",
   "python": "Python Starter",
   "python-wasm": "Python (Wasm) Starter",
   "r": "R Starter",

diff --git a/scripts/build.js b/scripts/build.js
@@ -229,6 +229,7 @@ const iifeBuild = () =>
       'languages/cpp/lang-cpp-script.ts',
       'languages/clang-wasm/lang-clang-wasm-script.ts',
       'languages/nim/lang-nim-wasm-script.ts',
+      'languages/janet-wasm/lang-janet-wasm-script.ts',
       'languages/fortran-wasm/lang-fortran-wasm-script.ts',
       'languages/d-wasm/lang-d-wasm-script.ts',
       'languages/cobol-wasm/lang-cobol-wasm-script.ts',

diff --git a/server/php/inc/starter-templates.json b/server/php/inc/starter-templates.json
@@ -39,6 +39,7 @@
   "ocaml": "Ocaml Starter",
   "nim": "Nim Starter",
   "nim-wasm": "Nim (Wasm) Starter",
+  "janet-wasm": "Janet (Wasm) Starter",
   "python": "Python Starter",
   "python-wasm": "Python (Wasm) Starter",
   "r": "R Starter",

diff --git a/src/livecodes/UI/command-menu-actions.ts b/src/livecodes/UI/command-menu-actions.ts
@@ -295,6 +295,7 @@ export const getCommandMenuActions = ({
         'ocaml',
         'nim',
         'nim-wasm',
+        'janet-wasm',
         'python',
         'python-wasm',
         'r',

diff --git a/src/livecodes/assets/templates/janet.png b/src/livecodes/assets/templates/janet.png
diff --git a/src/livecodes/html/language-info.html b/src/livecodes/html/language-info.html
@@ -1130,6 +1130,39 @@ <h3 data-i18n="language-info:imba.name">Imba</h3>
     <li><a href="https://imba.io/" target="_blank" rel="noopener">Official website</a></li>
   </ul>
 </section>
+<section data-lang="janet-wasm">
+  <h3 data-i18n="language-info:janetWasm.name">Janet (Wasm)</h3>
+  <div data-i18n="language-info:janetWasm.desc" data-i18n-prop="innerHTML">
+    The <a href="https://janet-lang.org/" target="_blank" rel="noopener">Janet</a> interpreter
+    compiled to WebAssembly, running entirely in the browser. It supports standard input and real
+    exit codes.
+  </div>
+  <ul data-i18n="language-info:janetWasm.link" data-i18n-prop="innerHTML">
+    <li>
+      <a href="https://janet-lang.org/" target="_blank" rel="noopener">Janet official website</a>
+    </li>
+    <li>
+      <a href="https://janet-lang.org/docs/index.html" target="_blank" rel="noopener"
+        >Janet documentation</a
+      >
+    </li>
+    <li>
+      <a href="https://learnxinyminutes.com/janet/" target="_blank" rel="noopener"
+        >Learn X in Y minutes, where X=Janet</a
+      >
+    </li>
+    <li>
+      <a href="{{DOCS_BASE_URL}}languages/janet-wasm" target="_blank" rel="noopener"
+        >LiveCodes Documentation</a
+      >
+    </li>
+    <li>
+      <a href="?template=janet-wasm" class="button" target="_parent" data-template="janet-wasm"
+        >Load starter template</a
+      >
+    </li>
+  </ul>
+</section>
 <section data-lang="java">
   <h3 data-i18n="language-info:java.name">Java</h3>
   <div data-i18n="language-info:java.desc" data-i18n-prop="innerHTML">

diff --git a/src/livecodes/i18n/locales/ar/language-info.lokalise.json b/src/livecodes/i18n/locales/ar/language-info.lokalise.json
@@ -387,6 +387,15 @@
   "imba.name": {
     "translation": "Imba"
   },
+  "janetWasm.desc": {
+    "translation": "مفسر <tag-1>Janet</tag-1> المُجمَّع إلى WebAssembly يعمل بالكامل داخل المتصفح. يدعم الإدخال القياسي ورموز الخروج الحقيقية."
+  },
+  "janetWasm.link": {
+    "translation": "<tag-1><tag-2>الموقع الرسمي لـ Janet</tag-2></tag-1> <tag-3> <tag-4>وثائق Janet</tag-4> </tag-3> <tag-5> <tag-6>تعلم X في Y دقيقة، حيث X = Janet</tag-6> </tag-5> <tag-7> <tag-8>وثائق LiveCodes</tag-8> </tag-7> <tag-9> <tag-10>تحميل قالب البدء</tag-10> </tag-9>"
+  },
+  "janetWasm.name": {
+    "translation": "Janet (Wasm)"
+  },
   "java.desc": {
     "translation": "JVM يعمل في المتصفح باستخدام DoppioJVM."
   },

diff --git a/src/livecodes/i18n/locales/ar/language-info.ts b/src/livecodes/i18n/locales/ar/language-info.ts
@@ -219,6 +219,11 @@ const languageInfo: I18nLangInfoTranslation = {
     link: '<1><2>الموقع الرسمي</2></1>',
     name: 'Imba',
   },
+  janetWasm: {
+    desc: 'مفسر <1>Janet</1> المُجمَّع إلى WebAssembly يعمل بالكامل داخل المتصفح. يدعم الإدخال القياسي ورموز الخروج الحقيقية.',
+    link: '<1><2>الموقع الرسمي لـ Janet</2></1> <3> <4>وثائق Janet</4> </3> <5> <6>تعلم X في Y دقيقة، حيث X = Janet</6> </5> <7> <8>وثائق LiveCodes</8> </7> <9> <10>تحميل قالب البدء</10> </9>',
+    name: 'Janet (Wasm)',
+  },
   java: {
     desc: 'JVM يعمل في المتصفح باستخدام DoppioJVM.',
     link: '<1> <2>موقع جافا الرسمي</2> </1>   <3>  <4> DoppioJVM</4> </3>  <5> <6> تعلم X في دقائق Y، حيث X = جافا</6> </5> <7> <8>وثائق LiveCodes</8> </7> <9> <10> تحميل قالب البدء</10> </9>',

diff --git a/src/livecodes/i18n/locales/ar/translation.lokalise.json b/src/livecodes/i18n/locales/ar/translation.lokalise.json
@@ -2022,6 +2022,9 @@
   "templates.starter.imba": {
     "translation": "قالب Imba"
   },
+  "templates.starter.janet-wasm": {
+    "translation": "قالب Janet (Wasm)"
+  },
   "templates.starter.java": {
     "translation": "قالب Java"
   },

diff --git a/src/livecodes/i18n/locales/ar/translation.ts b/src/livecodes/i18n/locales/ar/translation.ts
@@ -1013,6 +1013,7 @@ const translation: I18nTranslation = {
       'haskell-wasm': 'قالب Haskell (Wasm)',
       heading: 'قوالب البداية',
       imba: 'قالب Imba',
+      'janet-wasm': 'قالب Janet (Wasm)',
       java: 'قالب Java',
       javascript: 'قالب JavaScript',
       jest: 'قالب Jest',

diff --git a/src/livecodes/i18n/locales/bn/language-info.lokalise.json b/src/livecodes/i18n/locales/bn/language-info.lokalise.json
@@ -387,6 +387,15 @@
   "imba.name": {
     "translation": "Imba"
   },
+  "janetWasm.desc": {
+    "translation": "<tag-1>Janet</tag-1> ইন্টারপ্রেটার WebAssembly-তে কম্পাইল করা হয়েছে এবং এটি সম্পূর্ণভাবে ব্রাউজারে চলে। এটি স্ট্যান্ডার্ড ইনপুট এবং প্রকৃত এক্সিট কোড সমর্থন করে।"
+  },
+  "janetWasm.link": {
+    "translation": "<tag-1><tag-2>Janet অফিসিয়াল ওয়েবসাইট</tag-2></tag-1> <tag-3> <tag-4>Janet ডকুমেন্টেশন</tag-4> </tag-3> <tag-5> <tag-6>Y মিনিটে X শিখুন, যেখানে X=Janet</tag-6> </tag-5> <tag-7> <tag-8>লাইভকোড ডকুমেন্টেশন</tag-8> </tag-7> <tag-9> <tag-10>স্টার্টার টেমপ্লেট লোড করুন</tag-10> </tag-9>"
+  },
+  "janetWasm.name": {
+    "translation": "Janet (Wasm)"
+  },
   "java.desc": {
     "translation": "DoppioJVM ব্যবহার করে ব্রাউজারে চলমান JVM।"
   },

diff --git a/src/livecodes/i18n/locales/bn/language-info.ts b/src/livecodes/i18n/locales/bn/language-info.ts
@@ -220,6 +220,11 @@ const languageInfo: I18nLangInfoTranslation = {
     link: '<1><2>অফিসিয়াল ওয়েবসাইট</2></1>',
     name: 'Imba',
   },
+  janetWasm: {
+    desc: '<1>Janet</1> ইন্টারপ্রেটার WebAssembly-তে কম্পাইল করা হয়েছে এবং এটি সম্পূর্ণভাবে ব্রাউজারে চলে। এটি স্ট্যান্ডার্ড ইনপুট এবং প্রকৃত এক্সিট কোড সমর্থন করে।',
+    link: '<1><2>Janet অফিসিয়াল ওয়েবসাইট</2></1> <3> <4>Janet ডকুমেন্টেশন</4> </3> <5> <6>Y মিনিটে X শিখুন, যেখানে X=Janet</6> </5> <7> <8>লাইভকোড ডকুমেন্টেশন</8> </7> <9> <10>স্টার্টার টেমপ্লেট লোড করুন</10> </9>',
+    name: 'Janet (Wasm)',
+  },
   java: {
     desc: 'DoppioJVM ব্যবহার করে ব্রাউজারে চলমান JVM।',
     link: '<1> <2>Java অফিসিয়াল ওয়েবসাইট</2> </1> <3> <4>DoppioJVM</4> </3> <5> <6>Y মিনিটে X শিখুন, যেখানে X=java</6> </5> <7> <8>LiveCodes ডকুমেন্টেশন</8> </7> <9> <10>স্টার্টার টেমপ্লেট লোড করুন</10> </9>',

diff --git a/src/livecodes/i18n/locales/bn/translation.lokalise.json b/src/livecodes/i18n/locales/bn/translation.lokalise.json
@@ -2022,6 +2022,9 @@
   "templates.starter.imba": {
     "translation": "Imba স্টার্টার"
   },
+  "templates.starter.janet-wasm": {
+    "translation": "Janet (Wasm) স্টার্টার"
+  },
   "templates.starter.java": {
     "translation": "Java স্টার্টার"
   },

diff --git a/src/livecodes/i18n/locales/bn/translation.ts b/src/livecodes/i18n/locales/bn/translation.ts
@@ -1013,6 +1013,7 @@ const translation: I18nTranslation = {
       'haskell-wasm': 'Haskell (Wasm) স্টার্টার',
       heading: 'স্টার্টার টেমপ্লেট',
       imba: 'Imba স্টার্টার',
+      'janet-wasm': 'Janet (Wasm) স্টার্টার',
       java: 'Java স্টার্টার',
       javascript: 'JavaScript স্টার্টার',
       jest: 'Jest স্টার্টার',

diff --git a/src/livecodes/i18n/locales/de/language-info.lokalise.json b/src/livecodes/i18n/locales/de/language-info.lokalise.json
@@ -387,6 +387,15 @@
   "imba.name": {
     "translation": "Imba"
   },
+  "janetWasm.desc": {
+    "translation": "Der <tag-1>Janet</tag-1>-Interpreter wird zu WebAssembly kompiliert und läuft vollständig im Browser. Er unterstützt Standardeingabe und echte Exit-Codes."
+  },
+  "janetWasm.link": {
+    "translation": "<tag-1><tag-2>Offizielle Janet-Website</tag-2></tag-1> <tag-3> <tag-4>Janet-Dokumentation</tag-4> </tag-3> <tag-5> <tag-6>Lerne X in Y Minuten, wobei X = Janet</tag-6> </tag-5> <tag-7> <tag-8>LiveCodes-Dokumentation</tag-8> </tag-7> <tag-9> <tag-10>Startervorlage laden</tag-10> </tag-9>"
+  },
+  "janetWasm.name": {
+    "translation": "Janet (Wasm)"
+  },
   "java.desc": {
     "translation": "JVM läuft im Browser mit DoppioJVM."
   },