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Foundry

Foundry is a Rust-based, open-source toolkit for Ethereum and Solidity application development. It includes Forge, Cast, Anvil, Chisel and Solidity language-server support.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Foundry — 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 Foundry when an Ethereum development workflow needs contract lifecycle tooling, automated fuzzing, local node support and command-line EVM interaction in one modular toolkit.

Who it is for

  • Solidity developers building Ethereum applications
  • Teams testing and fuzzing smart contracts
  • Developers needing local EVM or fork-based testing environments
  • Engineers interacting with contracts and chain data from the command line

Documented uses

  • Build, test, fuzz, debug and deploy Solidity contracts with Forge
  • Send EVM transactions and retrieve chain data with Cast
  • Run a local Ethereum development node with Anvil
  • Experiment with Solidity in a REPL using Chisel
  • Connect a Solidity editor to Foundry's language-server mode
Before you choose

Requirements & limits

The project is publicly hosted and open source, with Apache-2.0-or-MIT licensing. It is presented as a CLI, desktop and self-hosted developer tool.

  • Choose Forge for the main Solidity build, test, fuzzing, debugging and deployment workflow.
  • Use Cast when the task is direct EVM interaction, transaction submission or chain-data retrieval.
  • Use Anvil when local-node or fork-based testing is required; the supplied example explicitly demonstrates mainnet forking.
  • Consider Chisel for interactive Solidity experimentation through a REPL.
  • Foundry's language-server mode can be configured for editor integration through forge lsp --stdio.

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

Configure Foundry as a Solidity language server

Start Foundry's documented Solidity editor integration for VS Code or another editor.

Before you start

  • Foundry installed.
  • A Solidity project.
  • VS Code installed for the documented VS Code workflow, or an editor that accepts a Solidity language-server command.

Steps

  1. From the Solidity project's terminal, run forge lsp to open the project in a VS Code Extension Development Host.

  2. For another editor, configure the Solidity language-server command as forge lsp --stdio.

  3. Use forge lsp --vscode when explicitly opening VS Code is required.

Expected outcome

Foundry provides the documented Solidity language-server backend for the selected editor workflow.

Guide limitations

  • The source explicitly documents the VS Code mode and the --stdio command for other editors, but does not provide editor-specific configuration steps beyond the command.
  • Solar-specific linting and project-setting behavior is documented, but no broader editor compatibility is established.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
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Sources checked
30 September 2026
Original website title
foundry-rs/foundry · Official homepage title · retained in its source language
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