JSONL Viewer Pro (Windows)

The fastest way to explore and analyze JSONL (JSON Lines) files on your desktop.

⚡ Blazing Fast Performance

• Handles 10M+ rows instantly
• Multi-threaded parsing with simdjson
• Tested with 5GB+ files

🎯 Smart Features

Nested Object Flattening

Automatically expands nested objects into columns:

• data.device_serial
• data.app_version
• user.profile.email

Filter and sort on any nested field!

Advanced Filtering

• Text search across all columns
• Numeric operators: >100, <=50, !=0
• Regex support (coming soon)

Column Management

• Freeze important columns
• Hide/show any field
• Auto-sizing

File Support

• .jsonl and .jsonl.gz (gzip compressed)
• Export filtered results
• Quick stats (min/max/avg)

Perfect For

• DevOps engineers analyzing logs
• Data scientists exploring datasets
• Backend developers debugging API responses
• IoT engineers reviewing telemetry
• Anyone tired of loading JSON into Excel/Pandas

Use Cases

"I analyze IoT device logs with deeply nested sensor data. JSONL Viewer

made it trivial to filter on device.temperature.celsius > 80 across

millions of records." - DevOps Engineer

Technical Details

• Built with C++, ImGui, simdjson
• Native performance (not Electron)
• Small footprint (~6MB app)
• No internet required
• Your data never leaves your machine