I would like to get the url parameter and if url is defined wrongly by user, i need to send an error.
My url is: localhost:8080/user?id=1
If the url entered by the user is: localhost:8080/use?id=1, how do we handle it?
if (app.get("/user")) {
app.get("/user",function(req,res,next){
console.log('In');
});
} else {
console.log('something went wrong in url');
}
No need for an if/else statement. Simply list all of your paths, and add a default path at the end. If query does not match with any of your definitions, it will call the default path.
app.get("/user",function(req,res){
res.send('called user');
});
...
app.get("/*", function(req, res){
res.send('wrong path');
});
Note that the order is important, if you put the "/*" at the top, it will dominate the others. So it has to be the last.
You can parse req.url using parse function from url module:
Here is the example from node.js documentation:
node> require('url').parse('/status?name=ryan')
{ href: '/status?name=ryan',
search: '?name=ryan',
query: 'name=ryan',
pathname: '/status' }
app.get is an event handler. The corresponding callback gets called only when a request matches that route. You don't need to specify an if statement for it. You need to do study a bit of javascript and how events/callbacks work. I think this article which looks decent.
app.get is an event handler. No need of the if condition. I prefer you to change the url from
localhost:8080/user?id=1
To
localhost:8080/user/1
If the path ie: localhost:8080/user/1 is not defined then the freamwork automatically display message
Cannot GET /user/1
app.get("/user/:id", function(req, res){
console.log('In userId = '+req.params.id);
}) ;
Note the :id, you can use this name to access the value in your code.If you have multiple variables in your url, for example
localhost:8080/user/1/damodaran
so your app.get will look like
app.get("/user/:id/:name", function(req, res){
console.log('In userId = '+req.params.id+' name:'++req.params.name);
}) ;
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