CodeLingo for i18n

Internationalize TypeScript / JavaScript / React apps faster. I18n Copilot finds missing and unused translations, flags hardcoded user-facing strings, validates interpolation placeholders, and can translate missing strings with an AI provider — all from inside VS Code.

Built for react-i18next with JSON/JSONC locale files.

Features

Translation dashboard in the Activity Bar — coverage per locale, problems, and quick actions.
Missing translation detection — keys used in code (or present in the source locale) but absent from a target locale, shown as diagnostics.
Unused key detection — keys defined in locale files but never referenced, with a confirm-gated "Remove unused key" fix.
Hardcoded string detection — AST-based detection of user-facing JSX text and attributes (conservative to avoid noise).
Convert to i18n — a Code Action that extracts a hardcoded string into a t("…") call, generates a deterministic key, adds the useTranslation() import/hook when needed, and updates the locale file.
Placeholder validation — verifies translations preserve {{name}} interpolations.
AI translation (optional) — translate missing keys with a provider-independent architecture (OpenAI supported), with a review panel where you accept / edit / reject before anything is written.

Requirements

A project using react-i18next (t(), useTranslation()).
JSON or JSONC locale files, either layout:
- flat: locales/en.json, locales/fr.json
- namespaced: locales/en/common.json, locales/fr/common.json

Commands

Command	What it does
I18n Copilot: Scan Workspace	Scan open files for hardcoded strings
I18n Copilot: Validate Translations	Analyze missing / unused keys
I18n: Translate Missing Keys	Translate missing keys via the AI provider
I18n: Set API Key	Store the provider API key securely

Code Actions (lightbulb): Convert to i18n, Generate missing translation, Remove unused translation key.

Configuration

Setting	Default	Description
`i18nCopilot.sourceLocale`	`en`	Source language to translate from
`i18nCopilot.targetLocales`	`[]`	Target languages (empty = infer from locale files)
`i18nCopilot.localesDir`	`src/locales`	Locale directory
`i18nCopilot.defaultNamespace`	`common`	Namespace prefix for generated keys
`i18nCopilot.ignoreNamespaces`	`[]`	Namespaces excluded from unused-key detection
`i18nCopilot.sourceGlobs`	`["src/*/.{ts,tsx,js,jsx}"]`	Source files to scan
`i18nCopilot.provider`	`null`	`null` (no-op) or `openai`
`i18nCopilot.providerModel`	`""`	Model id (e.g. `gpt-4o-mini`)

AI translation setup

Set i18nCopilot.provider to openai.
Run I18n: Set API Key and paste your key.
Run I18n: Translate Missing Keys, review the results, and accept the ones you want.

Your API key is stored in VS Code SecretStorage — never in settings, source, or logs.

Privacy

Translation is fully opt-in and only runs when you invoke it.
With provider: openai, the strings you translate are sent to OpenAI. Use the null provider to keep everything local.

License

MIT

CodeLingo for i18n

Ijaz Liaqat

CodeLingo for i18n

Features

Requirements

Commands

Configuration

AI translation setup

Privacy

License