How to set up i18n-node with Express.js?

Use app.use(i18n.init) to attach translation helpers to request and response objects, then call res.__() in routes. The README provides a middleware example and shows how to handle locale detection automatically.

i18n-node vs i18next: which should I use?

i18n-node is simpler and lighter for basic Node.js i18n with file-based storage, while i18next offers more features like plugins, broader framework support, and better tooling for complex applications. Choose based on your need for simplicity versus extensibility.

How to handle plural forms in different languages with i18n-node?

Use the __n() function with singular and plural phrases, and define locale-specific plural rules in JSON files (e.g., 'one', 'few', 'many' for Russian). The README explains how to configure these in the 'Pluralization Support' section.

Can i18n-node store translations in a database instead of JSON files?

Not directly; it's designed for JSON file storage. However, you can pre-load translations using staticCatalog or configure a custom parser, but dynamic database updates aren't natively supported, as mentioned in the configuration options.

How to auto-reload translation files without restarting the server?

Set autoReload: true in the configuration to watch for file changes, but note this can impact performance due to frequent disk I/O, and it's disabled when using staticCatalog, as per the README warnings.

What's the performance impact of using i18n-node?

Translations are cached in memory, so lookups are fast, but file system operations (like auto-reload or updateFiles) can slow down with many locales or large files. The README suggests using instances to isolate state for better concurrency.

i18n-node — Node.js Translation Module

What is i18n-node?

i18n-node is a lightweight translation module for Node.js that enables internationalization (i18n) in applications. It dynamically manages JSON-based language files and uses a simple `__('...')` syntax for translating strings in code and templates. The module solves the problem of adding multi-language support without heavy dependencies or complex configuration.

Target Audience

Node.js developers building web applications, REST APIs, or CLI tools that require multi-language support, especially those using frameworks like Express or restify.

Value Proposition

Developers choose i18n-node for its minimal setup, familiar syntax, and dynamic JSON storage that automatically adds new phrases. It’s framework-agnostic, supports advanced features like pluralization and MessageFormat, and avoids external parsing overhead.

Lightweight simple translation module for node.js / express.js with dynamic json storage. Uses common __('...') syntax in app and templates.

Use Cases

Best For

Adding internationalization to Express.js or restify APIs
Building CLI tools with multi-language output
Managing translations via JSON files compatible with services like webtranslateit
Implementing pluralization and variable substitution in translated strings
Dynamically adding new translation phrases during development
Supporting locale detection from cookies, headers, or query parameters

Not Ideal For

Applications requiring a graphical UI for translation management or collaborative editing workflows
High-traffic distributed systems where file-based storage creates synchronization bottlenecks
Projects needing real-time translation updates from a database or external API without file system reliance
Modern frontend-heavy applications where client-side i18n libraries would be more integrated

Pros & Cons

Pros

Dynamic Phrase Addition

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.

Framework Agnostic Design

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.

Advanced Pluralization Support

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.

Flexible Configuration Options

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.

Cons

File System Dependency

Primarily relies on JSON files stored on disk, which can be inefficient for scalable or cloud-native applications requiring database-backed translations. The README admits staticCatalog disables file-related features.

Limited Tooling Ecosystem

Lacks integrated GUI tools for translators and advanced features like translation memory, making it less suitable for large teams compared to alternatives with broader ecosystems.

Manual Setup Complexity

Requires explicit binding to request/response objects in non-Express frameworks, and the singleton vs. instance patterns can confuse users, as noted in the 'Usage' section warning about global scope issues.

Frequently Asked Questions

What is i18n-node?

Target Audience

Node.js developers building web applications, REST APIs, or CLI tools that require multi-language support, especially those using frameworks like Express or restify.

Value Proposition

Use Cases

Best For

Adding internationalization to Express.js or restify APIs
Building CLI tools with multi-language output
Managing translations via JSON files compatible with services like webtranslateit
Implementing pluralization and variable substitution in translated strings
Dynamically adding new translation phrases during development
Supporting locale detection from cookies, headers, or query parameters

Not Ideal For

Applications requiring a graphical UI for translation management or collaborative editing workflows
High-traffic distributed systems where file-based storage creates synchronization bottlenecks
Projects needing real-time translation updates from a database or external API without file system reliance
Modern frontend-heavy applications where client-side i18n libraries would be more integrated

Pros & Cons

Pros

Dynamic Phrase Addition

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.

Framework Agnostic Design

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.

Advanced Pluralization Support

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.

Flexible Configuration Options

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.

Cons

File System Dependency

Limited Tooling Ecosystem

Lacks integrated GUI tools for translators and advanced features like translation memory, making it less suitable for large teams compared to alternatives with broader ecosystems.

Manual Setup Complexity

Frequently Asked Questions

i18n-node

What is i18n-node?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?

i18n-node

What is i18n-node?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?