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+The app can be configured via the `config.json` file in the `data/` folder.
+
+The structure of the file is:
+```json
+{
+  "randomSeed" : 20,
+  "port" : 8888,
+  "captchaExpiryTimeLimit" : 5,
+  "throttle" : 10,
+  "threadDelay" : 2,
+  "captchas" : [ {
+    "name" : "FilterChallenge",
+    "allowedLevels" : [ "medium", "hard" ],
+    "allowedMedia" : [ "image/png" ],
+    "allowedInputType" : [ "text" ],
+    "config" : { }
+  }, {
+    "name" : "GifCaptcha",
+    "allowedLevels" : [ "hard" ],
+    "allowedMedia" : [ "image/gif" ],
+    "allowedInputType" : [ "text" ],
+    "config" : { }
+  }, {
+    "name" : "ShadowTextCaptcha",
+    "allowedLevels" : [ "easy" ],
+    "allowedMedia" : [ "image/png" ],
+    "allowedInputType" : [ "text" ],
+    "config" : { }
+  }, {
+    "name" : "RainDropsCaptcha",
+    "allowedLevels" : [ "easy", "medium" ],
+    "allowedMedia" : [ "image/gif" ],
+    "allowedInputType" : [ "text" ],
+    "config" : { }
+  } ]
+}%          
+```
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