Skip to main content
Start selling

JavaScript Software Development Kit for Freemius

Freemius offers a JavaScript (JS) SDK written in TypeScript to help you integrate Freemius into your SaaS applications. At a glance it has the following features:

  • API Client: A fully typed API client to interact with the Freemius API.
  • Checkout: Easily create and manage Checkout options and links for your application. Also has convenience methods to process redirections from the Hosted Freemius Checkout.
  • Webhooks: Create webhook listners for specific events and process incoming webhook requests from Freemius.
  • Pricing: Easily retrieve data for custom pricing tables within your software.
  • Purchase: Securely process and manage purchases made through Freemius.

The SDK works for any JavaScript runtime platform including Node.js, Bun, Deno etc. Please read the guides to get started.

Backend Use Only

The Freemius JS/TS SDK is intended for backend use only. It should not be used in frontend or client-side applications (browsers), as it requires access to sensitive credentials such as the Secret Key and Bearer Token. Exposing these credentials in a client-side environment can lead to security vulnerabilities and unauthorized access to your Freemius account.