i18n

Standardizes Next.js translation workflows with next-intl and build-time validation.

4|2|Updated Sep 17, 2025
One-click install
npx skills add https://github.com/SylphxAI/flow --skill i18n-sylphxai
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: i18n
Source: https://github.com/SylphxAI/flow/tree/main/.claude/skills/i18n
Command: npx skills add https://github.com/SylphxAI/flow --skill i18n-sylphxai

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Internationalization for Next.js apps is often ad-hoc and brittle. This Skill ensures centralized localization, avoids hard-coded strings, and enables scalable translations across routes.

Core Features & Use Cases

  • Next.js i18n with next-intl: Integrates translation loading, routing, and namespace management.
  • Locale management: Establishes locale folders and ensures proper redirection rules.
  • Build-time validation: Fails builds when translation keys are missing to guarantee UI integrity.

Quick Start

Set up i18n for a Next.js project using next-intl, create locale files for your supported languages, and enforce no hard-coded strings and build-time translation checks.

Frequently Asked Questions about i18n

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I set up internationalization for a Next.js app with next-intl?

Next.js i18n with next-intl involves configuring locale routing, creating translation bundles per language, and integrating next-intl middleware. This Skill standardizes that workflow by enforcing namespace-scoped bundles, server-friendly translation loading, and strict build-time validation to catch missing keys before deployment.

Why should I avoid hard-coded strings in Next.js translation workflows?

Hard-coded strings prevent scalable localization and create maintenance debt across routes. Centralizing translations through namespace-scoped bundles ensures every UI string is managed in one place, enabling consistent updates and reducing the risk of untranslated content reaching users.

Can I use build-time validation to prevent missing translation keys in Next.js?

Yes, build-time validation fails the build when translation keys are missing, guaranteeing UI integrity before production. This Skill enforces that check across all locale files, ensuring no incomplete translations slip through and every supported locale has complete coverage.

How do I structure locale files and routing rules for multi-language Next.js apps?

Locale management requires organizing translations into folder structures per language and establishing proper redirection rules. This Skill creates locale folders, defines routing constraints (such as preventing '/en/*' routes), and ensures seamless locale switching without hard-coded redirects.

What's the difference between ad-hoc and standardized Next.js localization workflows?

Ad-hoc i18n is brittle, fragmented across files, and prone to untranslated strings. Standardized workflows centralize translations, enforce build-time checks, and establish consistent routing—reducing bugs and scaling cleanly as you add languages.

Do I need a specific build process to validate translations in Next.js?

Yes, build-time validation requires a configured build step that checks translation key consistency across locales. This Skill integrates validation into the Next.js build pipeline so missing keys surface immediately, preventing broken deployments.