A high-performance Visual Studio Code extension that displays the length of arrays and the number of properties in objects directly in your JSON files using CodeLens.
Features
⚡️ Instant Performance: Built with a high-speed streaming parser (jsonc-parser) that handles massive JSON files (100k+ lines) instantly without freezing your editor.
🔢 Smart Counting:
Shows item count for Arrays ([ ... ]).
Shows property count for Objects ({ ... }).
🎯 Precision: Works correctly with nested structures, matrices, and mixed types.
⚙️ Configurable: Toggle what you want to see via settings.
Usage
Simply open any .json or .jsonc file. The extension will automatically display CodeLenses above arrays and objects.
Arrays: Array: 5 items
Objects: Object: 3 properties
Extension Settings
This extension contributes the following settings:
jsonLength.enable: Enable/disable the extension (default: true).
jsonLength.showArrayLength: Show item count for arrays (default: true).
jsonLength.showObjectPropertyCount: Show property count for objects (default: true).
Known Issues
None reported.
Release Notes
0.0.1
Initial release.
Support for counting array items and object properties.
Performance optimization for large files.
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