Express.js Routing error: Can't set headers after they are sent

Question

I\'m not really sure why I\'m getting this error. It\'s a simple API built on express.js to be able to add and remove posts. The error occurs when I trigger the delete route

Answer 1

Just for the sake of completeness I will also mention that: Sometime problem may be in a the middleware you may be using by calling app.use.

After checking for obvious errors as mentioned in previous answers:

You should remove all the app.use statement then reintroduce them one by one, to find problematic module.