NodeJs api with promises

Question

NodeJs api with promises

I am developing an API in TypeScript with NodeJS and MariaDB; when I do an operation with the bank, just below I have a if to check if any error occurred.

productDao.save({name:"Notebook Dell", price:"5000"}, function(err, res){
   if(err){
      //Código para caso algo dê errado.
   }else{
      //Código se tudo der certo.
   }
})

The case is: Can I use promises in an API? I would like it to look something like this:

productDao.save({name:"Notebook Dell", price:"5000"})
.then(res => {
   //Caso tudo dê certo.
})
.catch(err => {
   //Caso algo dê errado.
})

But, I wonder, is the default promise ideal for an API? What are the possible complications? What would be the disadvantages and advantages over this architecture in a API ?

2

api node.js design-pattern promises

Author: Márcio Eric, 2017-06-29

Source

1 answers

score 2 · Accepted Answer

You can use Promises or "old-fashioned" Callbacks as you like. The promises approach has advantages:

errors thrown within a promise call catch and do not stop the script, unlike a normal function that stops execution when there are errors
promise allows chaining and being included in high-order functions such as Promise.all

Regarding API, it is a matter of preference.