Guides
Problem-solving tutorials. Learn how to analyze huge files without uploading them anywhere.
How to Open 1GB CSV in Browser
Excel crashed? Here's how to preview and filter massive CSVs without any software.
How to Analyze nginx Access Log
Find 5xx errors, top IPs, and slow requests from your server logs.
Regex Extract from Huge Log File
Pull specific fields using regex without writing scripts.
Remove PII from Logs Locally
Mask emails, phone numbers, and IPs before sharing logs.
Why CSV is Slow (and How to Speed Up)
Understanding CSV parsing bottlenecks and streaming solutions.
JSON vs JSONL: Which to Use?
For large datasets, JSONL wins. Here's why.
Analyze Cloudflare Logs Locally
Extract Ray-IDs, status spikes, and top URLs without uploading.
Find Slow Requests in Logs
Use response time fields to surface slow endpoints.
Log Anomaly Basics
Detect spikes in 4xx/5xx errors by hour.
Group CSV by Column in the Browser
Summarize large CSVs without Excel.
Extract JSONL Schema from Logs
Find keys and structure quickly.
Convert CSV to JSONL (Local Workflow)
A safe path from CSV to streaming-friendly JSONL.
More guides coming soon. See Recipes for one-click analysis.