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+# Using GitBook programmatically
+
+GitBook is mainly designed to work as a command line utility, but it can also be integrated into javascript application (Node.js or browser).
+
+Its API can be used for parsing a book, modifying the structure of a book, or generating outputs.
+
+### Installation
+
+```
+$ npm install gitbook
+```
+
+### Design
+
+The GitBook Core API is built around **promises** and **immutable** models.
+
+### Example
+
+```js
+const GitBook = require('gitbook');
+
+// Create a filesystem interface
+const fs = GitBook.createNodeFS(__dirname + '/mybook');
+
+// Create a book instance
+const book = GitBook.Book.createForFS(fs);
+
+// Parse it
+GitBook.Parse.parseBook(book)
+.then(newBook => {
+    console.log('Done!');
+})
+```