About January

January is an API development platform designed to simplify the process of creating and running APIs by leveraging a powerful declarative language that integrates various tools and services, acting as an intermediary between business logic and server-side code.

workflow('HelloWorld', {
tag: 'example',
trigger: trigger.http({
method: 'post',
path: '/hello',
actions: {
sayHello: action.database.insert({
table: useTable('greetings'),
columns: [useField('message', '@trigger:body.message')],

This workflow uses an HTTP routing extension (such as hono.dev, express.js, etc.) and a database extension (such as PostgreSQL, MySQL, etc.) to create a fully functional API. It listens for POST requests on the /example/hello endpoint and inserts the message from the request body into a database table called greetings. The resulting Node.js code is pushed to a Git repository and can be deployed to a server through a deployment extension (such as Fly.io, Vercel, etc.).

January differs from traditional API development by abstracting imperative code and boilerplate, focusing on business logic with a "What to do" rather than "How to do it" approach. Furthermore, traditional development tends to be complex and resource-inefficient due to the numerous tools and services that need integration and maintenance. Through extensions, January simplifies this process by focusing on use-cases rather than specific tools.

pattern: '0 0 * * *',

This trigger is available through a scheduling extension (such as node-cron, bullmq, etc.), and moving from one library to another doesn't require changing the workflow, only the extension; January itself doesn't provide abstraction primitives but uses the code to provide instructions to the compiler to generate the necessary code.

Key features:

  • Portability GitHub, a first-class citizen of January, emphasizes portability as a key feature and serves as a platform for deploying and hosting the resulting code, allowing you to take and customize it as you see fit, ensuring your code is always accessible and version-controlled.

  • In-App Testing Production-like testing server to run the API directly from the platform without having to deploy prior using Swagger interface (Scalar.dev).

  • Extensions A wide range of extensions to interact with various services and tools, such as databases, HTTP routing, deployment, and more.

  • Declarative Language A declarative language (TypeScript internal DSL) that emphasizes colocating business logic with all the necessary components to run it.

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