Single-page PDF reports with automatic error detection, source mapping to exact revert lines, storage change decoding, and zero configuration.

Installation

npm install -g dogtrace

Usage

dog debug <tx-hash> --rpc http://localhost:8545 --contract ./src/Counter.sol

The server starts automatically on port 8844 (chosen to avoid conflicts with typical frontend dev servers on port 3000).

PDF report opens in your browser with:

• Transaction metadata (hash, from, to, block, gas)
• Error details with panic codes
• Function code with highlighted revert line
• Storage changes with decoded values

Requirements

Local development node only. DogTrace requires debug_traceTransaction RPC support.

Supported:

• Anvil (Foundry) - Enable with anvil --steps-tracing
• Hardhat Network

Important Notes

This is experimental software designed for local development workflows. Key considerations:

• Local nodes only - Does not work with public RPC endpoints or archive nodes
• Source code required - Best results when providing contract source for accurate revert locations
• No production use - Reports are generated in the OS temp directory and are not suitable for production debugging

Project Structure

dogtrace/
├── packages/
│   ├── cli/          # Command-line interface
│   ├── server/       # Express server & PDF generator
│   └── web/          # Future web UI (placeholder)

Development

# Install dependencies
npm install

# Build and link CLI (includes server)
cd packages/cli
npm run build
npm link

# Use CLI (server auto-starts on port 8844)
dog debug <tx-hash> --rpc http://localhost:8545

Contributing

Contributions welcome! This project serves developers debugging smart contracts on local networks. Focus areas:

• Additional storage type decoding (arrays, mappings, structs)
• Enhanced source mapping accuracy
• Support for more EVM-equivalent chains

License

MIT