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Edb

Edb is a command-line, time-travel debugger for Ethereum smart contracts that replays transactions and exposes Solidity execution for source-level inspection.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Edb — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use Edb when investigating how a particular Ethereum transaction executed and you want to examine the contract at Solidity source level.

Who it is for

  • Solidity developers investigating the execution of an on-chain Ethereum transaction.
  • Developers who need to inspect local values or control execution at source level rather than interpret only bytecode traces.
  • Developers working over SSH or without a browser who prefer a terminal debugger.

Documented uses

  • Replay an Ethereum transaction using chain state fetched through Ethereum RPC endpoints.
  • Step through Solidity execution and inspect local variables.
  • Evaluate expressions and control execution with breakpoints or watchpoints.
  • Choose between a browser-based debugger and a keyboard-driven terminal interface.
Before you choose

Requirements & limits

Edb is a CLI project. Its README documents a pre-built-binary installer and source builds; building from source requires stable Rust (2024 edition) and Bun for the embedded web UI. The repository specifies the AGPL-3.0 license.

  • Transaction replay requires Ethereum RPC access to fetch on-chain state; the README permits comma-separated RPC URLs and describes a public-endpoint fallback.
  • The browser UI is the default; --ui=tui selects the terminal interface, which the project identifies as useful over SSH or without a browser.
  • The pre-built-binary installer avoids requiring Rust or Bun; source builds require both, with Bun needed for the embedded web UI.
  • The project says it is under active development, so features and APIs may change.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Replay and inspect an on-chain transaction

Launch Edb on a transaction hash and choose its browser or terminal debugger interface.

Before you start

  • Edb installed using the documented pre-built-binary installer or built from source.
  • An Ethereum transaction hash.
  • Ethereum RPC URL or URLs; the README also documents a public-endpoint fallback when none are provided.

Steps

  1. Run edb --rpc-urls replay to start the browser-based debugger.

  2. For a terminal session, run edb --rpc-urls --ui=tui replay .

  3. Use source-level stepping, local-variable inspection, expression evaluation, and breakpoints or watchpoints to examine execution.

Expected outcome

A replayed transaction in Edb’s browser or terminal debugger, with Solidity-level inspection controls.

Guide limitations

  • The project is under active development, and features or APIs may change.
  • The public RPC fallback may be slow or unreliable; the README says using multiple endpoints can make replay faster.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
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Sources checked
9 October 2026
Original website title
edb-rs/edb · Official homepage title · retained in its source language
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