Created
May 24, 2015 17:09
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3.9 Dynamic Routes III
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| The following code has a Dynamic Route that takes a year | |
| as an argument and returns the city created in that year. | |
| The problem with our current implementation is that it | |
| breaks when invalid data is sent on client requests. | |
| Let's add some basic validation. |
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| app.js | |
| var express = require('express'); | |
| var app = express(); | |
| app.param('year', function(request, response, next) { | |
| if(isYearFormat(request.params.year)) { | |
| next(); | |
| } else { | |
| response.status(400).json('Invalid Format for Year'); | |
| } | |
| }); | |
| var citiesYear = { | |
| 5000: 'Lotopia', | |
| 5100: 'Caspiana', | |
| 5105: 'Indigo', | |
| 6000: 'Paradise', | |
| 7000: 'Flotilla' | |
| }; | |
| function isYearFormat(value) { | |
| var regexp = RegExp(/^d{4}$/); | |
| return regexp.test(value); | |
| } | |
| app.get('/cities/year/:year', function(request, response) { | |
| var year = request.params.year; | |
| var city = citiesYear[year]; | |
| if(!city) { | |
| response.status(404).json("No City found for given year"); | |
| } else { | |
| response.json("In " + year + ", " + city + " is created."); | |
| } | |
| }); | |
| app.listen(3000); |
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