Developers working with Juno now have access to a new release that allows frontends to be hosted on either heap or stable memory, along with support for Internet Identity login on the id.ai domain. The update aims to give creators more flexibility in how their applications operate and are served online.
The new hosting option enables frontends to reside in stable memory, which is recommended for applications where asset size may exceed the limits of heap memory. Websites, on the other hand, are advised to continue using heap memory, which provides faster responses and better search engine optimisation. Users can select their preferred memory type when creating a new satellite or switch between heap and stable memory via the Console’s Hosting settings tab, provided no files are actively being served.
Juno’s backend has seen updates to the Console, including the ability to create satellites with configurable storage options and a shift from the previous CDN crate to a custom implementation for asset handling and certification on the heap. These changes address the removal of certain features in CDN strategies and improve state management, using functions such as read_state and mutate_state to handle data securely. Other backend improvements include module restructuring, updated handling for id(), caller(), print(), and ManualReply to align with ic_cdk@0.18, and the application of unwrap_or_trap for more reliable responses.
The frontend has been refined with an improved user interface and workflow. The setup wizard now asks users what type of project they are building, automatically recommending heap memory for websites and stable memory for applications. A new Settings tab in Hosting allows developers to monitor the memory type used and switch between options when required. Additional refinements include avoiding metadata fetches from the CDN during development to support offline work, a replacement QR code generator library, and updated animations such as a new spinner to indicate loading status. Style adjustments and bug fixes ensure better readability, prevent layout shifts, and make interface elements more intuitive.
Satellite functionality has been expanded to serve assets from system collections in both heap and stable memory. The release introduces explicit initialisation options, better type definitions, and custom asset handling, along with the migration of core functions to ic_cdk@0.18. Mission Control now supports creating satellites with configurable storage and clearly defined init arguments.
Developers using Rust for serverless functions are encouraged to upgrade relevant crates and follow an iterative upgrade path for junobuild-satellite to maintain compatibility. While Orbiter and Observatory saw no changes, Sputnik inherits improvements made to the Satellite module.
Overall, the release strengthens Juno’s infrastructure and provides developers with clearer options for hosting, improved management tools, and additional flexibility for building scalable applications. The integration of Internet Identity login and the option to serve frontends from stable memory reflect the platform’s aim to balance performance with user control and reliability.
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