Translate string to multiple languages with Google Translation API in Node.js (no dependecies)

add_translation.js

const fs = require('fs');
const path = require('path');
const https = require('https');

const API_KEY = 'XXXX';

function translateText(text, targetLanguage) {
    return new Promise((resolve, reject) => {
        const url = `https://translation.googleapis.com/language/translate/v2?key=${API_KEY}&q=${encodeURIComponent(
            text
        )}&target=${targetLanguage}`;

        https.get(url, (res) => {
            let data = '';

            res.on('data', (chunk) => {
                data += chunk;
            });

            res.on('end', () => {
                const result = JSON.parse(data);
                if (result.error) {
                    reject(result.error);
                } else {
                    resolve(result.data.translations[0].translatedText);
                }
            });
        }).on('error', (err) => {
            reject(err.message);
        });
    });
}

async function updateTranslationFiles(rootDir, translationId, translationText) {
    const languageDirs = fs.readdirSync(rootDir);

    for (const languageDir of languageDirs) {
        const langPath = path.join(rootDir, languageDir);
        if (fs.lstatSync(langPath).isDirectory()) {
            const localizationFile = path.join(langPath, 'translation.json');

            const localizationData = JSON.parse(fs.readFileSync(localizationFile, 'utf8'));

            if (languageDir !== 'en') {
                localizationData[translationId] = await translateText(translationText, languageDir);
            } else {
                localizationData[translationId] = translationText;
            }

            fs.writeFileSync(localizationFile, JSON.stringify(localizationData, null, 2));
        }
    }
}


(async () => {
    const rootDir = './src/locales'; // Change this to the correct relative path
    const translationId = process.argv[2];
    const translationText = process.argv[3];

    if (!translationId || !translationText) {
        console.error('Please provide both translation ID and text as arguments');
        process.exit(1);
    }

    await updateTranslationFiles(rootDir, translationId, translationText);
})();

Run like this npm run translate -- signin "Sign In", and if you have translation files in src/locales/LANG/translation.json, it will add the following to all you translation files for all languages:

{
  XXXX
  "signin": "Anmelden"
}