🧾 data-languages

File extensions for data 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 data-languages

🔌 Usage

ES Modules (ESM):

import dataLangs from 'data-languages'

jsonLangData = dataLangs.JSON

console.log(jsonLangData.extensions) // => [ '.4DForm', '.4DProject', '.avsc', ... ]

CommonJS (CJS):

const dataLangs = require('data-languages')

jsonLangData = dataLangs.JSON

console.log(jsonLangData.extensions) // => [ '.4DForm', '.4DProject', '.avsc', ... ]

💻 Examples

Get language(s) from an extension:

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

console.log(getLang('.ical')) // => iCalendar

Get language(s) from a file path:

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

console.log(getLangFromPath('steam.vdf'))               // => Valve Data Format
console.log(getLangFromPath('Sublime.sublime-snippet')) // => XML
console.log(getLangFromPath('README.md'))               // => [] (use prose-languages pkg)

MIT License

Copyright © 2026 Adam Lui

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