npm install nlockjs

var Lock = require("nlockjs").Lock;

// New redis lock
var l = new Lock(15, {
    endpoints: "localhost:6379", // Redis endpoints
    password: ""                 // Redis password
});

// Lock
l.lock(key).then(function (ok) {
    // If has lock
    l.hasLock(key).then(function (yes) {
        assert.equal(yes, true);
        
        // Unlock
        l.unlock(key).then(function(ok) {
            assert.equal(ok, true);
        }, function(err) {
            console.error(err.toString());
        });
    }, function (err) {
        console.error(err.toString());
    });
}, function (err) {
    console.error(err.toString());
});

// Lock waiting for 5 seconds
l.lockWait(key, 5).then(function (ok) {
    assert.equal(ok, true);
}, function (err) {
    console.error(err.toString());
});

- lock(key)                       // lock

- lockWait(key, seconds)          // lock with waiting time

- isLocked(key)                   // check if locked

- hasLock(key)                    // check if has/own lock

- Unlock(key)                     // unlock