# Source: https://infisical.com/docs/cli/project-config.md

> ## Documentation Index
> Fetch the complete documentation index at: https://infisical.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Project config file

> Project config file & customization options

To link your local project on your machine with an Infisical project, we suggest using the infisical init CLI command. This will generate a `.infisical.json` file in the root directory of your project.

The `.infisical.json` file specifies various parameters, such as the Infisical project to retrieve secrets from, along with other configuration options. Furthermore, you can define additional properties in the file to further tailor your local development experience.

## Set default environment

If you need to change environments while using the CLI, you can do so by including the `--env` flag in your command.
However, this can be inconvenient if you typically work in just one environment.
To simplify the process, you can establish a default environment, which will be used for every command unless you specify otherwise.

```json .infisical.json theme={"dark"}
{
  "workspaceId": "63ee5410a45f7a1ed39ba118",
  "defaultEnvironment": "test",
  "gitBranchToEnvironmentMapping": null
}
```

### How it works

If both `defaultEnvironment` and `gitBranchToEnvironmentMapping` are configured, `gitBranchToEnvironmentMapping` will take precedence over `defaultEnvironment`.
However, if `gitBranchToEnvironmentMapping` is not set and `defaultEnvironment` is, then the `defaultEnvironment` will be used to execute your Infisical CLI commands.
If you wish to override the `defaultEnvironment`, you can do so by using the `--env` flag explicitly.

## Set Infisical environment based on GitHub branch

When fetching your secrets from Infisical, you can switch between environments by using the `--env` flag. However, in certain cases, you may prefer the environment to be automatically mapped based on the current GitHub branch you are working on.
To achieve this, simply add the `gitBranchToEnvironmentMapping` property to your configuration file, as shown below.

```json .infisical.json theme={"dark"}
{
  "workspaceId": "63ee5410a45f7a1ed39ba118",
  "gitBranchToEnvironmentMapping": {
    "branchName": "dev",
    "anotherBranchName": "staging"
  }
}
```

### How it works

After configuring this property, every time you use the CLI with the specified configuration file, it will automatically verify if there is a corresponding environment mapping for the current Github branch you are on.
If it exists, the CLI will use that environment to retrieve secrets. You can override this behavior by explicitly using the `--env` flag while interacting with the CLI.