express-handling

Using Standard Processing

If you wish for all promises to be handled as an API response, simply call standardProcessing on the response variable, passing in the promise or function that is to be handled.

router.get('/', function(req, res){
  var modelCall = new Promise(function(resolve, reject){
      return resolve(new AdapterResult(200, { data: "some data" }));
  });
  res.standardProcessing(modelCall);
});

Success

When a promise resolves, it is treated as success with a default code of 200.

Failure

When a promise rejects, it is treated as a failure with a default code of 500.

Simple data

If simple data is returned from the promise, it will be returned with the default status code

var modelCall = new Promise(function(resolve, reject){
    return resolve("Your name is Jim");
});

res.standardProcessing(modelCall);

var modelCall = new Promise(function(resolve, reject){
    return resolve({ name: "Jim" });
});

res.standardProcessing(modelCall);

Changing the status

To return a specific status code, use the AdapterResult class, passing in the status code and object to return.

var modelCall = new Promise(function(resolve, reject){
    return resolve(new AdapterResult(202, { data: "some data" }));
});
res.standardProcessing(modelCall);

Global Error Handling

To add global error handling to the app, add globalHandler to a use statement at the end of all server setup.

var app = require('express')();

...

app.use(require('express-handling').globalHandler);