composer/doc/06-config.md

# Config

This chapter will describe the `config` section of the `composer.json` schema.

## config <span>([root-only](04-schema.md#root-package))</span>

A set of configuration options. It is only used for projects.

## Properties

### process-timeout

Defaults to `300`. The duration processes like git clones can run before Composer assumes they died out. You may need to make this higher if you have a slow connection or huge vendors.

### use-include-path

Defaults to `false`. If true, the Composer autoloader will also look for classes in the PHP include path.

### preferred-install

Defaults to `auto` and can be any of `source`, `dist` or `auto`. This option allows you to set the install method Composer will prefer to use.

### store-auths

What to do after prompting for authentication, one of: `true` (always store), `false` (do not store) and `"prompt"` (ask every time), defaults to `"prompt"`.

### github-protocols

Defaults to `["git", "https", "ssh"]`. A list of protocols to use when cloning from github.com, in priority order. You can reconfigure it to for example prioritize the https protocol if you are behind a proxy or have somehow bad performances with the git protocol.

### github-oauth

A list of domain names and oauth keys. For example using `{"github.com": "oauthtoken"}` as the value of this option will use `oauthtoken` to access private repositories on github and to circumvent the low IP-based rate limiting of their API. [Read more](articles/troubleshooting.md#api-rate-limit-and-oauth-tokens) on how to get an OAuth token for GitHub.

### http-basic

A list of domain names and username/passwords to authenticate against them. For example using `{"example.org": {"username": "alice", "password": "foo"}` as the value of this option will let composer authenticate against example.org. 

### platform

Lets you fake platform packages (PHP and extensions) so that you can emulate a production env or define your target platform in the config. e.g. `{"php": "5.4", "ext-something": "4.0"}`.

### vendor-dir

Defaults to `vendor`. You can install dependencies into a different directory if you want to. `$HOME` and `~` will be replaced by your home directory's path in vendor-dir and all `*-dir` options below.

### bin-dir

Defaults to `vendor/bin`. If a project includes binaries, they will be symlinked into this directory.

### cache-dir

Defaults to `$COMPOSER_HOME/cache` on unix systems and `C:\Users\<user>\AppData\Local\Composer` on Windows. Stores all the caches used by composer. See also [COMPOSER_HOME](03-cli.md#composer-home).

### cache-files-dir

Defaults to `$cache-dir/files`. Stores the zip archives of packages.

### cache-repo-dir

Defaults to `$cache-dir/repo`. Stores repository metadata for the `composer` type and the VCS repos of type `svn`, `github` and `bitbucket`.

### cache-vcs-dir

Defaults to `$cache-dir/vcs`. Stores VCS clones for loading VCS repository metadata for the `git`/`hg` types and to speed up installs.

### cache-files-ttl

Defaults to `15552000` (6 months). Composer caches all dist (zip, tar, ..) packages that it downloads. Those are purged after six months of being unused by default. This option allows you to tweak this duration (in seconds) or disable it completely by setting it to 0.

### cache-files-maxsize

Defaults to `300MiB`. Composer caches all dist (zip, tar, ..) packages that it downloads. When the garbage collection is periodically ran, this is the maximum size the cache will be able to use. Older (less used) files will be removed first until the cache fits.

### prepend-autoloader

Defaults to `true`. If false, the composer autoloader will not be prepended to existing autoloaders. This is sometimes required to fix interoperability issues with other autoloaders.

### autoloader-suffix

Defaults to `null`. String to be used as a suffix for the generated Composer autoloader. When null a random one will be generated.

### optimize-autoloader
 
Defaults to `false`. Always optimize when dumping the autoloader.

### classmap-authoritative

Defaults to `false`. If true, the composer autoloader will not scan the filesystem for classes that are not found in the class map. Implies 'optimize-autoloader'.

### github-domains

Defaults to `["github.com"]`. A list of domains to use in github mode. This is used for GitHub Enterprise setups.

### github-expose-hostname

Defaults to `true`. If set to false, the OAuth tokens created to access the github API will have a date instead of the machine hostname.

### notify-on-install

Defaults to `true`. Composer allows repositories to define a notification URL, so that they get notified whenever a package from that repository is installed. This option allows you to disable that behaviour.

### discard-changes

Defaults to `false` and can be any of `true`, `false` or `"stash"`. This option allows you to set the default style of handling dirty updates when in non-interactive mode. `true` will always discard changes in vendors, while `"stash"` will try to stash and reapply. Use this for CI servers or deploy scripts if you tend to have modified vendors.

### archive-format

Defaults to `tar`. Composer allows you to add a default archive format when the workflow needs to create a dedicated archiving format.

### archive-dir

Defaults to `.`. Composer allows you to add a default archive directory when the workflow needs to create a dedicated archiving format. Or for easier development between modules.

Example:

```json
{
    "config": {
        "bin-dir": "bin"
    }
}
```

> **Note:** Authentication-related config options like `http-basic` and
> `github-oauth` can also be specified inside a `auth.json` file that goes
> besides your `composer.json`. That way you can gitignore it and every
> developer can place their own credentials in there.

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