Serverless Apps SDK

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The Crowdin Serverless Apps SDK is a TypeScript toolkit for building apps that run on Crowdin infrastructure. You write the UI and register the modules the app appears in, and the CLI builds, previews, and publishes the bundle. It ships a UI kit styled to match Crowdin, an i18n runtime for the app’s own translations, and an API client that calls Crowdin as the person using the app, with no tokens to manage.

What You Can Build

With the Crowdin Serverless Apps SDK you can build an app around Crowdin’s UI modules:

Project modules: Dashboards, tools, reports, and menu items inside a project.
Editor modules: Panels beside the translation editor.
Organization and profile modules: Pages in the organization and profile menus.
Dialogs: Modals, context menus, and chat panels.

Building a Serverless App

An AI coding agent can build the app for you, or you can run the CLI yourself. The CLI scaffolds the app, runs it locally, and publishes it.

npm install --global @crowdin/serverless-apps-cli
crowdin-serverless-apps login
crowdin-serverless-apps create my-app
crowdin-serverless-apps dev
crowdin-serverless-apps preview
crowdin-serverless-apps publish

Crowdin hosts and runs the published app, so there is no server of your own to deploy or maintain.

Read more about each step in the Quick Start.

Serverless Apps SDKTemplates, SDK guides, CLI commands, and API reference.

When to Build a Self-Hosted App Instead

Serverless apps cover the UI side of Crowdin. When your app needs server-side logic (for example, file processing, AI providers, custom MT engines, or webhook handling), build it as a self-hosted app. The same applies when your app combines an interface with server-side logic: self-hosted apps can include UI modules as well.

A self-hosted app also works with the Crowdin API differently: it makes calls as the account that installed it, not as the person using it.