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anylang init creates anylang.config.json. 
{
  "sourceLocale": "en",
  "targetLocales": ["hi"],
  "include": ["src/**/*.{js,jsx,ts,tsx,vue,html}"],
  "exclude": ["node_modules", ".git", "dist", "build", ".next"],
  "outDir": "locales",
  "runtime": {
    "output": "src/anylang.ts",
    "importFrom": "anylang-dev/runtime"
  },
  "functionName": "$tr",
  "autoTranslate": {
    "jsx": true,
    "keyPrefix": "auto"
  },
  "provider": {
    "name": "openrouter",
    "baseUrl": "https://openrouter.ai/api/v1",
    "model": "openai/gpt-4.1-mini"
  }
}

​
Locale settings

sourceLocale is the language you write in your source files. targetLocales is the list of locales anylang prepares and translates. 
{
  "sourceLocale": "en",
  "targetLocales": ["hi", "ja", "es"]
}

​
File matching

By default, anylang scans .js, .jsx, .ts, .tsx, .vue, and .html files under src. 
{
  "include": ["src/**/*.{js,jsx,ts,tsx,vue,html}"],
  "exclude": ["node_modules", ".git", "dist", "build", ".next"]
}

​
Output

outDir controls locale JSON output. runtime.output controls the generated TypeScript runtime file. 
{
  "outDir": "locales",
  "runtime": {
    "output": "src/anylang.ts",
    "importFrom": "anylang-dev/runtime"
  }
}

​
Auto JSX translation

When autoTranslate.jsx is enabled, static JSX text can be transformed by the Vite plugin or Next.js wrapper. 
{
  "autoTranslate": {
    "jsx": true,
    "keyPrefix": "auto"
  }
}
Use $tr("key", "source text") for dynamic text or places where you want a stable hand-written key.

​
API provider

OpenRouter is a good default provider because it lets you switch models without changing the rest of your anylang setup. 
{
  "provider": {
    "name": "openrouter",
    "baseUrl": "https://openrouter.ai/api/v1",
    "model": "openai/gpt-4.1-mini"
  }
}
Add your OpenRouter key to .env. 
OPENROUTER_API_KEY=your-openrouter-key