Sample composer.json for TYPO3 projects.

composer.json

{
	"name": "",
	"description" : "TYPO3 CMS Distribution for example.org",
	"license": "GPL-2.0+",
	"repositories": [
		{
			"type": "composer",
			"url": "https://composer.typo3.org/"
		}
	],
	"require": {
		"typo3/cms": "~7.6.0",
		"helhum/typo3-console": "1.2.*",
		"fluidbt/fluidbootstraptheme": "dev-typo3v7-compat",
		"fluidtypo3/flux": "dev-development",
		"fluidtypo3/fluidcontent": "dev-development",
		"fluidtypo3/fluidpages": "dev-development",
		"fluidtypo3/vhs": "dev-development#97f272c555fced24bc701e30ad71543c046def7f",
		"typo3-ter/realurl": "~1.13",
		"doctrine/couchdb": "@dev",
		"typo3-ter/rlmp-language-detection": "7.0.*",
		"cweagans/composer-patches": "~1.0",
		"typo3-ter/news": "4.2.*",
		"typo3-ter/sitemap-generator": "~0.5",
		"typo3-ter/my-user-management": "^2.3",
		"typo3-ter/powermail": "^3.0",
		"typo3-ter/tinysource": "^4.0",
		"etobi/coreapi": "dev-master"
	},
	"require-dev": {
		"mikey179/vfsStream": "1.4.*@dev",
		"phpunit/phpunit": "~4.7.0"
	},
	"autoload": {
		"psr-4": {
			"Company\\Extensionname\\": "web/typo3conf/ext/extensionname/Classes/"
		}
	},
	"autoload-dev": {
		"psr-4": {
		},
		"classmap": []
	},
	"extra": {
		"typo3/cms": {
			"cms-package-dir": "{$vendor-dir}/typo3/cms",
			"web-dir": "web"
		},
		"patches": {
			"typo3/cms": {
			}
		}
	}
}