JSON i18n via GPT, Google, or a local Llama

What it does

jsontt is a Node-based CLI and library that ingests JSON or YAML files and translates every string value into one or more target languages, including deeply nested objects. It acts as a router to more than a dozen backends, from free cloud scrapers like Google Translate and Bing to paid APIs such as DeepL and OpenAI, plus local inference via llama-cpp.

The interesting bit

The standout feature is --fallback: if your chosen module hits a rate limit or fails, the tool automatically tries another backend rather than aborting the job. It also exposes a concurrency limiter, which is essentially a built-in apology for how aggressively free translation endpoints throttle you.

Key highlights

• Supports both JSON and YAML, including deep object traversal.
• Backends range from free options (Google, Bing, Libre, Argos, llama-cpp) to key-gated LLMs (GPT-4o, Gemma, Mixtral, Llama via Groq).
• CLI can batch-translate into multiple languages in one pass.
• Automatic fallback logic retries with alternative modules on failure.
• Proxy support for the Google Translate module to mitigate IP throttling.

Caveats

• Proxy support is restricted to the Google Translate module only.
• Browser support is listed as “will come soon,” so it is strictly Node.js and CLI for now.
• Many backends (DeepL, OpenAI, Groq) require API keys; the “FREE” label applies only to specific modules.

Verdict

Worth a look if you maintain i18n files and want one utility that can pivot between free scrapers, paid APIs, and local LLMs. Skip it if you need a browser-based workflow or collaborative review features.