What is intlayer-backend?

An Intlayer integration for Node.js and Bun servers, including frameworks such as Express, Fastify, Hono, NestJS, AdonisJS, and Elysia. Middleware detects the language for each request so server code can return translated content.

Use it to translate API responses or other server-rendered content, register locale middleware, and read translated dictionaries in route handlers and services.

It avoids passing a locale through every service and route function. Translation helpers can use the language associated with the current request, based on sources such as a cookie or the browser's language header.

How aymericzip/intlayer configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to aymericzip/intlayer. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/aymericzip/intlayer/main/.agents/skills/intlayer-backend/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/aymericzip/intlayer

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/aymericzip/intlayer/intlayer-backend/github.svg)](https://agentmods.dev/skills/aymericzip/intlayer/intlayer-backend)

Your own site

<a href="https://agentmods.dev/skills/aymericzip/intlayer/intlayer-backend"><img src="https://agentmods.dev/badge/skills/aymericzip/intlayer/intlayer-backend/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/aymericzip/intlayer/intlayer-backend"><img src="https://agentmods.dev/badge/skills/aymericzip/intlayer/intlayer-backend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,159 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00082	$0.01159
Opus 5.5	$0.00033	$0.00464
Sonnet 5.5	$0.00016	$0.00232
Haiku 4.5	$0.00008	$0.00116

Measured 22d ago against content hash f07cb7383a4b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

intlayer-backend scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 22d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

intlayer-backend — 100% identical, 0 lines differ

.agents/skills/intlayer-backend/SKILL.md · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Intlayer Backend Usage

Core Philosophy

Every backend integration works the same way:

A middleware / plugin (intlayer()) resolves the locale of each request (cookie, header, Accept-Language) and scopes it to that request.
Helpers (t, getIntlayer, getDictionary) read that request locale, so they are safe to call from services without threading a locale argument through every function.

Framework	Package	Registration
Express	`express-intlayer`	`app.use(intlayer())`
NestJS	`express-intlayer`	`consumer.apply(intlayer()).forRoutes("*")`
Fastify	`fastify-intlayer`	`await fastify.register(intlayer)`
Hono	`hono-intlayer`	`app.use("*", intlayer())`
Elysia	`elysia-intlayer`	`.use(intlayer())`, helpers read from route `intlayer`
AdonisJS	`adonis-intlayer`	Registered middleware (see the AdonisJS guide)

Declare Content

File: src/index.content.ts

import { t, type Dictionary } from "intlayer";

const content = {
  key: "index",
  content: {
    exampleOfContent: t({
      en: "Example of returned content in English",
      fr: "Exemple de contenu renvoyé en français",
    }),
  },
} satisfies Dictionary;

export default content;

Usage

Register the middleware / plugin from the table above before the routes that read content (see the Express guide), then call the helpers in any handler:

import { t, getIntlayer, getDictionary } from "express-intlayer";
import dictionaryExample from "./index.content";

app.get("/", (_req, res) => {
  res.send(t({ en: "Hello", fr: "Bonjour" })); // Inline translation
});

app.get("/by-key", (_req, res) => {
  res.send(getIntlayer("index").exampleOfContent); // Dictionary by key
});

app.get("/by-import", (_req, res) => {
  res.send(getDictionary(dictionaryExample).exampleOfContent); // Imported dictionary
});

Read the full file on GitHub · 114 lines

Files

What ships with it

24 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

22d ago First seen · 114 lines · 82 tokens per session scan A f07cb7383a4b

Subscribe to this mod's changes

intlayer-backend is a skill published in the GitHub repository aymericzip/intlayer (851 stars, last pushed 4d ago), licensed Apache-2.0. It adds 82 tokens to every session and 1,159 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-24.

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intlayer: Skill for Claude Code