memory-fs

memory-fs

A simple in-memory filesystem. Holds data in a javascript object.

var MemoryFileSystem = require("memory-fs");
var fs = new MemoryFileSystem(); // Optionally pass a javascript object

fs.mkdirpSync("/a/test/dir");
fs.writeFileSync("/a/test/dir/file.txt", "Hello World");
fs.readFileSync("/a/test/dir/file.txt"); // returns Buffer("Hello World")

// Async variants too
fs.unlink("/a/test/dir/file.txt", function(err) {
	// ...
});

fs.readdirSync("/a/test"); // returns ["dir"]
fs.statSync("/a/test/dir").isDirectory(); // returns true
fs.rmdirSync("/a/test/dir");

fs.mkdirpSync("C:\\use\\windows\\style\\paths");

License

Copyright (c) 2012-2014 Tobias Koppers

MIT (http://www.opensource.org/licenses/mit-license.php)

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memfs

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unionfs

unionfs allows you to create a union of multiple filesystems. While it can work with in-memory filesystems, it can also combine real filesystems and has a broader scope compared to memory-fs.

mock-fs

mock-fs is a library for mocking the Node.js fs module. It allows you to intercept file system operations and provide custom in-memory implementations. It is primarily used for testing purposes and offers a different approach compared to memory-fs.