ComfyUI-XAVJsonNodes

https://github.com/XAV-Games/ComfyUI-XAVJsonNodes

Convenient nodes for working with JSON directly inside ComfyUI. Load files, navigate nested structures, create empty containers, modify values, and save the result back — all within your workflow.

Features

• XAV Load JSON File – load and cache JSON from a file.
• XAV Navigate JSON – access array elements (by index) or object properties (by string key).
• XAV JSON to Primitives – convert the current node to simple types (int, float, bool, string).
• XAV Create Empty JSON Object – create an empty {} or [].
• XAV Set JSON Value – set a string value by key in an existing object/array.
• XAV Set JSON Value From Ref – insert another JSON node by key.
• XAV Save JSON to File – save any node to a file.

All nodes are located in the XAV/json category.

⚡ Performance & Optimization

These nodes were designed with speed and efficiency in mind:

• In‑memory caching – JSON files are loaded only once and stored globally. Subsequent runs reuse the parsed object instantly.
• Reference‑based access – navigation and modification work directly on the original Python objects. No deep copies, no serialization/deserialization overhead during edits.
• Minimal dependencies – the entire extension uses only Python's built‑in modules; there is zero external library overhead.
• Fast path for primitives – conversion to int, float, bool, or string uses direct type casting with minimal branching.
• Lazy evaluation – objects are not touched until a node actually reads or writes them.

In practice, operations like loading a 10 MB JSON, navigating deep paths, and modifying values happen in microseconds — ideal for high‑throughput ComfyUI workflows.