JSONL Reader - Visual Studio Code Extension

A fast and efficient reader for JSON Lines (JSONL / NDJSON) files with pagination, search, and syntax highlighting.

Features

• Pagination: Load large JSONL files in pages instead of all at once
• Syntax Highlighting: Color-coded JSON syntax for better readability
• Search: Full-text search across JSONL files with regex support
• Line Navigation: Jump to specific lines quickly
• Statistics: View file statistics (total lines, valid JSON, errors)
• Copy Functionality: Copy individual lines or entire JSON objects
• Error Detection: Identify and highlight malformed JSON lines

Installation

1. Open VS Code
2. Go to Extensions (Ctrl+Shift+X)
3. Search for "JSONL Reader"
4. Click Install

Usage

Open a JSONL File

1. Via Command Palette:

   • Press Ctrl+Shift+P
   • Type "Open JSONL File"
   • Select your .jsonl or .ndjson file

2. Via Right-Click:

   • Right-click on any .jsonl or .ndjson file in the Explorer
   • Select "Open with JSONL Reader"

3. Via File Association:

   • The extension automatically opens .jsonl and .ndjson files by default

Interface Overview

The JSONL Reader provides a custom editor with:

• Toolbar: Search, navigation, and settings
• Line List: Paginated view of JSONL lines with expandable details
• Search Panel: Search results and navigation
• Pagination Controls: Navigate through pages of lines
• Statistics Display: File size, line counts, and error counts

Keyboard Shortcuts

• Ctrl+F / Cmd+F: Focus search input
• Ctrl+G / Cmd+G: Go to line
• Ctrl+C / Cmd+C: Copy selected line (when focused)
• Enter: Expand/collapse line details

Configuration

The extension can be configured via VS Code settings:

• jsonlReader.pageSize: Number of lines per page (default: 100)
• jsonlReader.maxSearchResults: Maximum search results (default: 1000)
• jsonlReader.useAsDefault: Use as default editor for JSONL files (default: true)

Supported File Formats

• .jsonl - JSON Lines format
• .ndjson - Newline Delimited JSON format

Requirements

• VS Code version 1.109.0 or higher

Known Issues

• Very large files (10GB+) may have slower indexing
• Search may be slower on very large files

Release Notes

0.0.1

Initial release of JSONL Reader:

• Basic JSONL file viewing with pagination
• Search functionality with regex support
• Syntax highlighting for JSON
• File statistics display
• Copy functionality for lines

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT License - see LICENSE file for details