💻 markup-languages

File extensions for markup languages.

It's just a JSON file, so you can use it in any environment. Sourced from GitHub's Linguist project (defines all 700+ languages known to GitHub). Data is updated via script and released via new package version.

⚡ Installation

From your project root:

npm install markup-languages

🔌 Usage

ES Modules (ESM):

import markupLangs from 'markup-languages'

htmlLangData = markupLangs.HTML

console.log(htmlLangData.extensions) // => [ '.hta', '.htm', '.html', '.html.hl', ... ]

CommonJS (CJS):

const markupLangs = require('markup-languages')

htmlLangData = markupLangs.HTML

console.log(htmlLangData.extensions) // => [ '.hta', '.htm', '.html', '.html.hl', ... ]

💻 Examples

Get language(s) from an extension:

function getLang(fileExt) {
    const langMatches = Object.entries(markupLangs)
        .filter(([_, data]) => data.extensions.includes(fileExt))
        .map(([lang]) => lang)
    return langMatches.length == 1 ? langMatches[0] : langMatches
}

console.log(getLang('.sss')) // => SugarSS

Get language(s) from a file path:

function getLangFromPath(filepath) {
    const fileExt = filepath.slice(filepath.lastIndexOf('.'))
    const langMatches = Object.entries(markupLangs)
        .filter(([_, data]) => data.extensions.includes(fileExt))
        .map(([lang]) => lang)
    return langMatches.length == 1 ? langMatches[0] : langMatches
}
console.log(getLangFromPath('index.html')) // => [ 'Ecmarkup', 'HTML' ]
console.log(getLangFromPath('style.css'))  // => CSS
console.log(getLangFromPath('script.js'))  // => [] (use programming-languages pkg)

MIT License

Copyright © 2026 Adam Lui

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