CODEWITHSUNDEEP
node.jschmodfs
pvorb
pvorb

Reputation: 7289

How do I use chmod with Node.js

How do I use chmod with Node.js?

There is a method in the package fs, which should do this, but I don't know what it takes as the second argument.

fs.chmod(path, mode, [callback])

Asynchronous chmod(2). No arguments other than a possible exception are given to the completion callback.

fs.chmodSync(path, mode)

Synchronous chmod(2).

(from the Node.js documentation)

If I do something like

fs.chmodSync('test', 0755);

nothing happens (the file isn't changed to that mode).

fs.chmodSync('test', '+x');

doesn't work either.

I'm working on a Windows machine btw.

Upvotes: 59

Views: 59139

Answers (3)

CascadiaJS
CascadiaJS

Reputation: 2505

On Windows, instead of on Octal number or string, you need to use fs.constants or fsPromises.constants. For example, to change a file to open for read only access you would use:

fs.chmodSync(filePath, fs.constants.O_RDONLY)

You can find the values for fs.constants here: Node File System Constants

Upvotes: 1

Rajitha Wijayaratne
Rajitha Wijayaratne

Reputation: 726

The correct way to specify Octal is as follows:

fs.chmodSync('test', 0o755);

Refer to the file modes here.

Upvotes: 25

qiao
qiao

Reputation: 18219

According to its sourcecode /lib/fs.js on line 508:

fs.chmodSync = function(path, mode) {
  return binding.chmod(pathModule._makeLong(path), modeNum(mode));
};

and line 203:

function modeNum(m, def) {
  switch (typeof m) {
    case 'number': return m;
    case 'string': return parseInt(m, 8);
    default:
      if (def) {
        return modeNum(def);
      } else {
        return undefined;
      }
  }
}

it takes either an octal number or a string.

e.g.

fs.chmodSync('test', 0755);
fs.chmodSync('test', '755');

It doesn't work in your case because the file modes only exist on *nix machines.

Upvotes: 71

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