lingosyncTranslation sync for real projects

Maintain one master file. lingosync keeps every other locale in sync — new keys get translated, deleted keys disappear everywhere, and nothing you've pinned by hand ever gets overwritten.

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One master, many locales

Add a language to an array and run one command. No more hand-copying keys across a dozen JSON files.

Incremental by design

A hash-based lock file means only new or changed keys get translated — every sync after the first is fast and cheap.

Never clobbers manual edits

Pin any locale+key combination with an override. Future syncs skip it forever, even if the master changes.

Bring your own translation provider

Ships with a DeepL adapter and a network-free "manual" provider for testing. Adding a new provider is one small file.

Placeholder-safe

{{variables}}, %s, and {0}-style interpolations are shielded before translation and restored after — automatically.

Zero-cost to adopt

BYO API key. No account, no paid tier, no vendor lock-in — it's just an npm package.

See it in action

Adding a new language

Add a locale code to languages in your config and run sync — the full translation file gets generated from scratch, no missing keys.

Syncing a change

Change one value in the master file and run sync again — only that key gets re-translated across every locale. Everything else is left exactly as it was.