Debug and Trace | Monad

The debug and trace JSON RPC methods allow developers to trace transaction execution and analyze contract calls on Monad with detailed step-by-step information.

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Tracing and debugging on the Monad blockchain can be done by using the following methods:

debug_traceTransaction

debug_traceBlockByNumber

debug_traceBlockByHash

debug_traceCall

These methods support multiple tracers including:

• callTracer — traces all calls made during execution
• prestateTracer — returns the state accessed during execution
• stateDiffTracer — returns state changes made during execution

This information can be used for:

• Debugging — understand why transactions failed or behaved unexpectedly.
• Security analysis — analyze contract interactions and fund flows.
• Gas optimization — identify expensive operations in contract execution.
• Forensics — trace transaction paths for audit and compliance.