Node.js: What is the difference between path.join() and path.resolve() in Node.js?

join() — concatenates paths. resolve() — resolves to absolute path.

path.join():

• Concatenates paths.
• May return relative path.
• Simpler.

1const path = require("path");
2
3path.join("/foo", "bar", "baz");  // /foo/bar/baz
4path.join("foo", "bar", "baz");   // foo/bar/baz (relative)

path.resolve():

• Resolves to absolute path.
• From right to left.
• Handles .. and .

1path.resolve("/foo", "bar", "baz");  // /foo/bar/baz
2path.resolve("foo", "bar", "baz");   // /current/dir/foo/bar/baz
3path.resolve("/foo", "../bar");      // /bar

Key differences:

• join — concatenate, may be relative.
• resolve — absolute path, handles ../.