Simple example.

examples/simple/Readme.md

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+## Run
+
+```bash
+SERVER_PORT=8888 node index.js
+```

examples/simple/env.json

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+{
+  "SERVER_PORT": 1
+}

examples/simple/index.js

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+var http = require('http')
+  , env = require('../..')()
+
+function handleEnv (err) {
+  if (!err) return
+  process.exit(1)
+}
+
+if (env.ok(handleEnv)) {
+  var port = env.get('SERVER_PORT')
+  var server = http.createServer(function (req, res) {
+    res.end('Thanks, Env\n');
+  }).listen(port)
+
+  server.on('listening', function () {
+    console.log('Node server listening on :%d', port)
+  })
+}