💻 prose-languages

File extensions for prose 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 prose-languages

🔌 Usage

ES Modules (ESM):

import proseLangs from 'prose-languages'

mdLangData = proseLangs.Markdown

console.log(mdLangData.extensions) // => [ '.livemd', '.markdown', '.md', ... ]

CommonJS (CJS):

const proseLangs = require('prose-languages')

mdLangData = proseLangs.Markdown

console.log(mdLangData.extensions) // => [ '.livemd', '.markdown', '.md', ... ]

💻 Examples

Get language(s) from an extension:

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

console.log(getLang('.gmi')) // => Gemini

Get language(s) from a file path:

function getLangFromPath(filepath) {
    const fileExt = filepath.slice(filepath.lastIndexOf('.'))
    const langMatches = Object.entries(proseLangs)
        .filter(([_, data]) => data.extensions.includes(fileExt))
        .map(([lang]) => lang)
    return langMatches.length == 1 ? langMatches[0] : langMatches
}

console.log(getLangFromPath('document.adoc')) // => AsciiDoc
console.log(getLangFromPath('README.md'))  // => Markdown
console.log(getLangFromPath('index.mdx'))  // => [] (use markup-languages pkg)

MIT License

Copyright © 2026 Adam Lui

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