jsonltui is a fast TUI application (with optional slow webui) to visually navigate and inspect JSON and JSONL data. Easily localize parse errors in large JSONL files. Made with LLM fine-tuning workflows in mind.

With JSONL error handling:

With modal view for large strings:

pip install jsonltui

• Interactive tree view of JSON and JSONL data in both TUI and Web UI
• Supports both single JSON objects and JSONL (multiple JSON objects, one per line)
• Graceful handling of parsing errors, displaying them inline with successfully parsed data
• Expandable error nodes showing original unparsable text and error messages
• Truncation of long text values with the ability to view full text in a modal
• Keyboard navigation for easy exploration of the JSON structure in TUI mode
• Web-based interface for a more familiar and accessible visualization

You can use jsonltui in three ways:

1. With a JSON or JSONL file using the TUI:

   jsonltui path/to/your/file.json
   

2. With piped input using the TUI:

   cat path/to/your/file.json | jsonltui
   

3. With the Web UI option:

   jsonltui --webui path/to/your/file.json
   

   or

   cat path/to/your/file.json | jsonltui --webui
   

• Arrow keys: Navigate the tree
• Enter: Expand/collapse nodes or view full text of truncated values
• 'q' or Ctrl+C: Quit the application
• 'b' or Escape: Go back from full text view to main tree view

The Web UI provides a familiar interface with collapsible tree nodes and expandable long text values. It opens in your default web browser, allowing for easy navigation and exploration of your JSON/JSONL data.

When jsonltui encounters a parsing error in a JSONL file, it will:

1. Display the error in red at the appropriate position in the tree.
2. Show the line number where the error occurred.
3. Allow you to expand the error node to see:
   • The original unparsable text
   • The specific error message

This allows you to inspect and debug issues in your JSON data easily.

1. Ensure you have Python 3.7 or higher installed on your system.

2. Clone this repository:

   git clone https://github.com/gr-b/jsonltui.git
   cd jsonltui
   

3. Install locally

   pip install -e .
   

• The application loads the entire JSON/JSONL file into memory, so it may not be suitable for extremely large files.
• Syntax highlighting is not provided for the JSON structure in the TUI to maintain simplicity and performance.

This project is licensed under the MIT License - see the LICENSE file for details.