I am trying to get route parameters working with express, i have the following code trying to use the colon to define the parameters, if I do just the station id it works app.get('/:stationId/ but adding on the radius part just doesn't return anything. What am i doing wrong?
app.get('/:stationId/asset?radius=:radius', (req, res) => {
console.log(req.params.stationId)
console.log(req.params.radius)
})
I know I would be able to change the url to be app.get('/:stationId/:radius but i need it in the other format.
Parameters after the ? are handled differently:
app.get("/:stationId/asset", (req, res) => {
console.log(req.params.stationId);
console.log(req.query.radius);
});
Related
¿can you help me to understand this?
If I have an endpoint in a specific route it will display in the browser the expected content, but with the same code just modifying the endpoint it doesn't return anything.
The only change that I do is the route of the endpoint, the rest of code is the same in both cases.
¿Why this happen?
The code displays in the browser the content of a json file:
this way it doesn't work:
It doesn't show an error, just don't return anything.
localhost:3000/v1/people/partner
app.get("/v1/people/partner", (req, res) => {
const peopleInVisual = PeopleController.getAllVisualPeople();
res.json({ peopleInVisual });
});
In this way it works fine: notice I just have changed the hello at the endpoint
localhost:3000/v1/hello/partner
app.get("/v1/hello/partner", (req, res) => {
const PeopleInVisual = PeopleController.getAllVisualPeople();
res.json({ PeopleInVisual });
});
Thanks!
I have an express route that I want to find a uid value and for some reason it isn't working I was wondering what I was doing wrong. I keep getting an error whenever I got to localhost:8080/user?uid=20 and I want to retrieve 20 as the param uid but keep getting an error.
My path
/user?uid=:uid\d+
The code itself
router.get('/user\?uid=:uid\d+', (req,res) => {
res.send('This works');
});
Having a regex patter for catching query string is not a good practice. Reduce your route to /user, then you can have access to your query strings through req, just like this:
for localhost:3000/user?uuid=20
router.get('/user', (req,res) => {
console.log(req.query); // { uuid: 20 }
console.log(req.query.uuid); // 20
res.send('This works');
});
You can have more information here: https://expressjs.com/es/api.html#req.query
I want to redirect to a page where the path is like /users/home/:id
response.redirect('/users/home')
The above code will redirect to /users/home but I want to redirect it to a page like '/users/home/1' dynamically with parameters. How shall I solve it?Do explain with some examples
You could use template literals to form the new url, for example:
app.get("/users/home/:id", (req, res) => {
res.redirect(`/users/alternate_home/${req.params.id}`);
});
app.get("/users/alternate_home/:id", (req, res) => {
res.json(users);
});
app.route('/users')
.post(user.post)
.get(user.get)
.get(user.everyone)
.put(user.update)
.delete(user.delete);
I have ran into the problem of my function using two res.send, so I am getting the 'Error: cannot set header after they are sent.' error, to fix this I have turned it into two functions which I am trying to use two .get on the app.route, but it seems I can only use one as when I use two the second one doesn't work.
Is there a way I could use two .get on one app.route?
If not, what are my options to get around this problem?
You need to create separate routes for each api endpoint like this:
app.route('/users').get(req, res) => {
//Get all users
});
app.route('/users:/id').get(req, res) => {
//Get specific user
});
app.route('/users').post(req, res) => {
//Create new user
});
app.route('/users/:id').put(req, res) => {
//Update user
});
app.route('/users/:id').delete(req, res) => {
//Delete user
});
Once res.send is called, means your server has sent the response to the browser or whatever. you can't change the already sent response and its header.
You can use multiple callbacks on one route and one method(post,get)
An array of callback functions can handle a route. For example:
var cb0 = function (req, res, next) {
console.log('CB0')
next()
}
var cb1 = function (req, res, next) {
console.log('CB1')
next()
}
var cb2 = function (req, res) {
res.send('Hello from C!')
}
app.get('/example/c', [cb0, cb1, cb2])
yes, you can use multiple HTTP requests either its .get or .post but with different params. or routes.
I am trying to send a variable to the page after I have redirected to another page. I have very basic knowledge in Node.js and can't seem to figure out a way to do that. Here's my code.
app.get('/search' , function (req, res) {
var postcode = req.query.search;
var ward = my_search.getWardNum(postcode,(ward) => {
res.redirect('/:ward'+ ward);
});
});
app.get('/ws/:postcode' , function (req, res) {
var postcode = req.params.postcode.replace("+","");
console.log(pc);
my_search.postcodeLookUp(pc,(ward) => {
var area = my_search.lookupWard(ward);
res.send(area);
});
});
So in the first app.get(), I get the postcode and redirect to another page.
However, I still need that postcode with second app.get().
I understand that nature of node.js is async. Is there a way to do what I want to do?
When you "redirect", you're not just changing the URL the user sees, you're sending a HTTP response with a status code indicating that the client should try to access another page instead.
You can't send data after you redirect because the full response has already been sent! You should consider why you're redirecting and if it is really necessary. You could also redirect to a route containing the URL parameter that you want to be present:
res.redirect('/ward/' + ward + '/' + postcode);
...
app.get('/ward/:wardID/:postcode', (req, res, next) => {
// route code here...
});
Note that you'll probably want a prettier format than that, but that is one way to accomplish this.