refactoring-result.js

app.get('/data/:entry_id', (req, res, next) => {
    next();
});

app.get('/data/:entry_id/filtered', (req, res, next) => {    
    dataFilterService(req.result)
        .then((apiResult) => {
            req.metadata = {
                info: 'data is filtered',
                event: 'api.result.received'
            }
            
            req.result = apiResult;
            next();
        })
        .catch(next);
});