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    Changelog (2025)

    2025-09-09🔗

    • Developer/API Changes
    • Feature There is now a WebAssembly Component Model-based plugin system. Plugins file names must end in ".wasm" and there is no requirement that plugins be written in Rust. Plugins are automatically discovered when instantiating node instances. Built in plugins are located at staticfs://plugins/ and include WebAssembly Interface Types (WIT) files to generate bindings. Both nodes and plugins may reference other plugins for functionality.
    • Feature markdown Added a wasm plugin for Markdown parsing / html generation.
    • Feature math Added a wasm plugin for some machine learning functions based on linfa, ndarray, and nalgebra.
    • Feature arrow Added a wasm plugin for Arrow RecordBatch and DataFusion functionality.
    • Nodes are also now implemented as WebAssembly Components.

    2025-09-08🔗

    • Feature The Graph applet now supports exporting a Graph file/bundle directly to the desktop, and loading a Graph file/bundle directly from the desktop in the "Create or Open Graph" popup.
    • Feature The Plotter Node and the Report Generator Node now generate artifacts that can be exported directly from the Manage/Files tab, simplifying sharing charts and reports outside of DataCogs.
    • Minor Enhancements
    • Improved app and documentation style for narrow screens/windows
    • Graph file list performance improvements

    2025-09-07🔗

    • 🚨 Breaking Changes
      • Underlying Worksheet format has changed in order to support Decimal data type
    • Feature Nodes now have a Files tab that enables exporting files generated by a node from the graph to either the DataCogs virtual file system or to the OS.
    • Feature Worksheets now support the Decimal data type, which is useful in financial calculations. the d(..) function declares a Decimal number, and can take a string or numeric type. =d("0.1")+d("0.2") correctly results in 0.3. Mathematical operations on Decimal numbers will sometimes automatically covert other numeric types to Decimal, but will never automatically convert a Decimal number into a less precise type. In practice this means =d("0.1") + 0.2 will convert the 0.2 floating point number to Decimal and result in 0.3, but =0.1 + d("0.2") will result in an error.
    • Updated Worksheet documentation to include Decimal type.

    2025-09-04🔗

    • Welcome screen now shows both documentation and template selection
    • Opening applets / panels on a narrow screen/window now defaults to opening panels vertically instead of horizontally.
    • Added Zoom in/out buttons to graph and adjusted center graph button
    • Added new example graphs demonstrating Worksheet outputs and Plotter node
    • Bug Fix Fixed issue with scatter plots not showing last element

    2025-09-03🔗

    • Feature Overhauled the Plotter Node, fixing several issues.
    • Pie charts display as donuts/rings when multiple datasets are provided
    • Fixed Bar and Line charts to support multiple datasets
    • Scatter Plot supports multiple datasets with each dimension coming from a different dataset
    • Added Box Plot support
    • Minor Enhancements
    • Graph Applet configuration panel style improvements
    • File Browser now sorts alphabetically ignoring case
    • Bug Fix Fixed Aggregate Data node not fetching data under certain conditions
    • Bug Fix Fixed issue with ReadCSV node where under certain conditions data was not being provided to downstream nodes on graph load/start.

    2025-08-28🔗

    • Overhauled Node Container to improve overall platform reliability
    • Graph templates open faster
    • Bug Fix Fixed issue with Data Frame viewer having glitchy scrolling when changes pages
    • Bug Fix Fixed issue with CSV files in certain cases not providing all rows.
    • Bug Fix Generate ID Column node and DataFrame Viewer now correctly support paginated (append) record batch requests.

    2025-08-24🔗

    • Feature Graph Applet - Notes now support different colors
    • Feature Worksheet Node - Now displays a visual indicator for all output windows directly on the sheet.
    • Bug Fix Graph Applet - Fixed issue where saving a graph file over a previously created file would sometimes cause errors on loading the graph.
    • Bug Fix Worksheet Node - Fixed some off-by-one issues with output windows.
    • Bug Fix Graph Applet - Disallow closing panel while saving (so that data files aren't removed before save is complete)
    • Minor Enhancements:
    • Graph Applet - Allow text selection in node management tabs

    2025-08-23🔗

    • Feature Graph Applet - Graph files and templates now support embedding data in the graph file. This will simplify storing and sharing node artifacts such as models and worksheets.
    • Feature Worksheet Node - Now defaults to storing worksheet directly in the graph file.
    • Minor Enhancements:
    • File Browser - Added support for hidden folders/files
    • File Browser - Added file last modified timestamps
    • Graph Applet - Now shows a confirmation panel when closing graph that hasn't been saved.

    2025-08-17🔗

    • Minor Enhancements:
    • Summary Statistics node now displays results directly on the node

    2025-08-16🔗

    • Feature Graph Applet - Added basic support for touch screens and small screens. It's not quite enough to build graphs, but it's sufficient for running examples from the templates screen.
    • Bug Fix Menu bar now scrolls horizontally when overflowed (for small screen support).

    2025-08-15🔗

    • Feature Graph Applet - Added the ability to create and save Templates
    • Feature Graph Applet - When opening a blank graph, defaults to show a list of available Templates
    • Feature Graph Applet - Created a couple example templates

    2025-08-14🔗

    • Feature Graph Applet - Added Insert Note capability to add Markdown notes directly to a graph.
    • Bug Fix Graph Applet - Fixed issue where dropping files onto the graph did not place the resulting nodes in the correct (dropped) location.
    • Bug Fix Worksheet Node - Fixed issu where text in the selected node sometimes overflowed above the scrollable area.

    2025-08-11🔗

    • New Node: Write to CSV
    • New Node: Read JSON
    • Write File node now supports saving JSON data
    • Minor Enhancements:
    • Column Properties node attempts to guess Id and Target columns
    • Fixed issues with Tabular Data visualizing applet where CSV files were truncated

    2025-08-05🔗

    • Fixed various UI issues in Graph applet
    • Minor Enhancements:
    • Manage panel is now resizable
    • Node connections/wires now have a delete button at the middle of the wire, visible on hover

    2025-07-29🔗

    Various improvements to the Worksheet Node:

    • Feature Worksheet Node - Implemented configurable output "windows" of worksheet data. This allows for providing slices of worksheet data to other nodes.
    • Feature Worksheet Node - In addition to RecordBatch, added support for additional input protocols (JSON and raw text)
    • Feature Worksheet Node - Added several aggregate commands: sum, product, count, min, max, average
    • Feature Worksheet Node - Added support for toggling sheet cells as HTML or Markdown cells, rendering the content of that cell as HTML
    • Minor Enhancements:
      • Worksheet Node - improved performance when resizing rows and columns
      • Worksheet Node - improved performance when scrolling through cells
      • Worksheet Node - improved rendering of overflow text and multiline content

    2025-07-22🔗

    This update consists of several major architectural changes.

    • 🚨 Breaking Changes

      • Old graphs are not compatible with this release due to a fundamental redesign of the node connection and execution model. Existing saved graphs will need to be recreated.
      • Node API: All custom node development should now use the new Node Task API. The legacy push-based API was removed and not supported in this release.

    • Major Architectural Overhaul

      • Push-based → Pull-based Graph
        • The core graph architecture has shifted from a push-based to a pull-based model. Instead of upstream nodes “pushing” data to their outputs, connections are now organized around Channels.
        • Channels are bi-directional, subscribe-able connections between nodes. Downstream nodes subscribe to events/data on channels, which enables:
          • Live reconfiguration: add/remove/refresh nodes or connections while the graph is running.
          • More robust and flexible dataflow.
          • Simpler and safer handling of complex data pipelines.
          • This change unlocks a huge set of features and makes the graph much more stable for both interactive and long-running workflows.
      • New Node Task API
        • Node development has been reimagined around a Task-based API.
          • Nodes are now written as collections of tasks which each register their interests (what events/data they need).
          • Tasks can subscribe/unsubscribe to channels, track and react to configuration/state changes, and trigger actions when upstream/downstream conditions change.
          • Designed for composability and clarity—much easier to reason about than the previous event-mess.

    • New & Improved Features

      • File Access & Storage Overhaul
        • File I/O in nodes now uses a robust sync/blocking API.
        • Added a file abstraction layer supporting seek/truncate operations.
        • The Worksheet node now supports saving and loading data from files.

    • New & Updated Nodes

      • Worksheet Node: Now supports spreadsheet-like editing, cell references, and persistent file storage.
      • Tabular Model Nodes:
        • Now support Logistic Regression, Decision Tree, and Linear Regression trainers (rewritten for the new API).
        • Transform pipelines and feature engineering nodes (scaling, encoding, missing value handling, etc.) have been reworked for reliability and compatibility.
          • Aggregate, Generate ID Column, Data Split, Column Properties, and Category Encoder nodes have all been ported to the new API and now support the channel system.
        • Report Generator Node:
          • Tera-based templating engine improved.
          • New json_as_table filter for easy data reporting.
          • Reports can now render results directly inside node in addition to output.
        • Plotter Node:
          • Completely rewritten to use new API.
          • Charts/plots can now be visualized directly inside nodes, not just sent to output.
        • Data Frame Viewer:
          • Improved JSON rendering.
          • Now reliably handles dynamic columns.

    • Developer/API Changes

      • Datacogs Node API
        • New Task API is now the only supported method for authoring custom nodes.
        • Low-level ABI available for use with other languages (compile to wasm32-wasip1).
        • Node and channel manifests have been expanded—channels are now a first-class concept.
        • Manifests may be .json or .jsonc
      • Refactoring & Cleanup
        • Node implementation code has been modularized and moved into logical workspaces/projects.
        • Improved error reporting and logging (including support for native println! fallback).
        • Logging and subscription/event code has been overhauled for reliability and clarity.

    • Other Notable Fixes & Improvements

      • Fixed many issues with event propagation, file access, logging, and node shutdown/cleanup.
      • Improved node library search, modal/keyboard interaction, and applet/node communication.
      • Node logs and settings panels now include new UI features (insert marker, improved filtering, clearing, and type handling).
      • Numerous small tweaks and stability fixes across the entire stack.

    2025-02-22🔗

    • Feature Added a new Worksheet node for creating and editing tabular data in a spreadsheet-like interface.
    • Bug Fix Fixed various issues with nodes not properly receiving certain events.
    • Bug Fix Fixed issue with nodes not shutting down when deleted from the graph.

    2025-02-16🔗

    • Feature Graph Applet - Improved many keyboard shortcuts.
      • New:
        • Ctrl+Alt+s: Save As
        • Escape: Close Node Library popup
        • Arrow Keys/Enter: Navigate Node Library and place nodes
        • c: Return to center of the graph
        • l: Open the Node Library panel

    2025-02-14🔗

    • Feature Partially reimplemented Rune Code node with new API.
    • Bug Fix Fixed issues with Tabular Models node when generating predictions.
    • Updated documentation including videos, improved callouts, and updated example workflow to reflect new user interface.

    2025-02-13🔗

    • Feature Double-clicking on the graph now pops open the Node Library filtering on "Source" nodes to quickly add a new source node.
    • Feature Clicking an output port, dragging and dropping onto an empty space in the graph now pops open the Node Library filtering compatible nodes to quickly add nodes.

    2025-02-10🔗

    • Complete overhaul of the Graph Orchestrator
      • Consolidated several dependencies
      • Decreased node and applet package sizes
      • Bug Fix Fixed several potential issues where nodes could clobber each other's data
      • API Enhancement Streamlined file access, message port access, and other APIs for nodes
      • API Enhancement Improved node security and isolation
      • Bug Fix Fixed race conditions when shutting down nodes
    • API Enhancement Major overhaul to node <=> applet API

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