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Configuring with foundry.toml

Forge can be configured using a configuration file called foundry.toml, which is placed in the root of your project.

Configuration can be namespaced by profiles. The default profile is named default, from which all other profiles inherit. You are free to customize the default profile, and add as many new profiles as you need.

Additionally, you can create a global foundry.toml in your home directory.

Let's take a look at a configuration file that contains two profiles: the default profile, which always enables the optimizer, as well as a CI profile, that always displays traces:

[profile.default]
optimizer = true
optimizer_runs = 20_000

[profile.ci]
verbosity = 4

When running forge, you can specify the profile to use using the FOUNDRY_PROFILE environment variable.

Standalone sections

Besides the profile sections, the configuration file can also contain standalone sections ([fmt], [fuzz], [invariant] etc). By default, each standalone section belongs to the default profile. i.e. [fmt] is equivalent to [profile.default.fmt].

To configure the standalone section for different profiles other than default, use syntax [profile.<profile name>.<standalone>]. i.e. [profile.ci.fuzz].


📚 Reference

See the foundry.toml Reference for a complete overview of what you can configure.