> For the complete documentation index, see [llms.txt](https://docs.january.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.january.ai/readme.md).

# January Developer Platform

Build food discovery, nutrition, meal logging, and glucose-prediction experiences with January.

## Get started

* [**Documentation**](/docs/overview.md) — understand the platform, authentication model, and available capabilities.
* [**Quickstart**](/docs/quickstart.md) — make your first authenticated REST API request in a few minutes.
* [**REST API reference**](/rest-api/api-overview.md) — explore every endpoint, request field, and response interactively.
* [**iOS SDK**](/ios-sdk/ios-sdk.md) — controlled-preview Swift package and native scanner.
* [**Android SDK**](/android-sdk/android-sdk.md) — controlled-preview Kotlin SDK and Compose scanner.
* [**Web and Node.js SDK**](/web-and-node.js-sdk/web-sdk.md) — controlled-preview TypeScript SDK and React example.

The client SDKs remain controlled previews. Their installation pages describe the currently supported private distribution paths. Restaurant-menu lookup by restaurant ID is documented ahead of backend deployment and must stay disabled in production until January announces route availability and matching SDK releases.

## Authentication boundary

Backend services authenticate with an `sk-…` API key. Client applications must never ship that key; exchange it on your backend for a short-lived `ct-…` client token bound to the signed-in end user.

Create and manage credentials in the [January Developer Dashboard](https://dashboard.january.ai).