i18n-node

Automatically adds new translation strings to JSON files on first use, eliminating manual entry during development. This is highlighted in the README as a core feature that simplifies the workflow.

Works with any Node.js framework exposing request/response objects, not just Express, as demonstrated in examples with plain HTTP and restify. The module uses app.use() for easy integration.

Handles complex plural rules via __n() and MessageFormat with __mf(), supporting locale-specific forms like Russian's multiple plural categories, which is detailed in the API section.

Offers both singleton and instance modes for shared or isolated state, along with configurable locale detection from headers, cookies, or query parameters, as shown in the configuration examples.