Debugging React Native

# Read recent logs
python scripts/read_logs.py

# Execute JS in app
python scripts/execute_in_app.py "Date.now()"

Only use discover_apps.py or --app-id when you get an error about multiple apps being connected.

python scripts/read_logs.py [--max-logs 100] [--filter "error|warn"] [--timeout 5]

• --filter: Regex to filter log messages
• --timeout: Seconds to collect logs (default: 5)
• --app-id: Only needed if multiple apps connected
• --metro-url: Override Metro URL (default: http://localhost:8081)

Errors and warnings include stack trace location.

python scripts/execute_in_app.py "expression" [--no-await] [--timeout 10]

# Or pipe expression
echo "globalThis.myVar" | python scripts/execute_in_app.py

• --no-await: Don't await Promise results
• --app-id: Only needed if multiple apps connected
• --metro-url: Override Metro URL (default: http://localhost:8081)
• Supports any JS: variable access, function calls, IIFEs, etc.

python scripts/discover_apps.py [--metro-url URL] [--json]

Filter for errors:

python scripts/read_logs.py --filter "error|Error|ERROR"

Run diagnostic code:

python scripts/execute_in_app.py "(async () => { const resp = await fetch('http://api.example.com/health'); return resp.status; })()"