fs.writeFileSync and fs.inlinkSyn to a particular file not working

[Emmanuel Amodu]

I am trying to update a certain file with the writeFileSync  method but it is not working

"negotiate": function(menu){

if (menu) {

//this would be changed later to the appropraite request

//get url from menu

//getting task list quesions

menu = fs.readFileSync(rootPath + menu.output, 'utf8');

menu = JSON.parse(menu);

}

var userData = fs.readFileSync(this.pathToUserTable(), 'utf8');

userData = JSON.parse(userData);

userData = this.updateUserDataForNegotiate(userData, menu);

//fs.unlinkSync(this.pathToUserTable());//this not working

fs.writeFileSync(this.pathToUserTable(), JSON.stringify(userData));//this not working
fs.writeFileSync(rootPath + "/database/users/test.json", JSON.stringify(userData));//this is working

this.res.send(menu);

},

This is very weird and frustrating, I have been trying for hours to get it to work. Pls I need help.