javascript - Express js - cannot get query parameters from url (req.query is an empty object) - Stack Overflow

admin管理员组

文章数量:1419248

I know this topic was mentioned here and here but it didn't work for me.

I'm trying to get parameters from URL using req.query. In my server.js file I've got this:

app.get('/reset-pass', function(req,res) {
    console.log(req.url);
    console.log(req.query);
})

When I'm entering URL e.g. http://localhost:3000/reset-pass?email=anything, server console outputs this:

/reset-pass
[Object: null prototype] {}

and when I fetch from http://localhost:4001/reset-pass, browser console outputs empty object:

data {
    "query": {}
}

As you can see I run my node server on 4001 port and client site on 3000 (because I'm running React on that port) and it's working well doing POST requests or redirects, but in GET case it doesn't return query params. Any weird # do not appear in my path (or I just don't know it).

What's wrong with it?

I know this topic was mentioned here and here but it didn't work for me.

I'm trying to get parameters from URL using req.query. In my server.js file I've got this:

app.get('/reset-pass', function(req,res) {
    console.log(req.url);
    console.log(req.query);
})

When I'm entering URL e.g. http://localhost:3000/reset-pass?email=anything, server console outputs this:

/reset-pass
[Object: null prototype] {}

and when I fetch from http://localhost:4001/reset-pass, browser console outputs empty object:

data {
    "query": {}
}

As you can see I run my node server on 4001 port and client site on 3000 (because I'm running React on that port) and it's working well doing POST requests or redirects, but in GET case it doesn't return query params. Any weird # do not appear in my path (or I just don't know it).

What's wrong with it?

• javascript
• node.js
• reactjs
• express

Share Improve this question Follow edited Jun 30, 2020 at 10:39 yuna_nymphais asked Jun 25, 2020 at 13:45 yuna_nymphaisyuna_nymphais 27122 gold badges33 silver badges1414 bronze badges 2

• Your statement looks contract with each other. Above example you use 3000 for server, but at bottom you say you run node on 4001..? And what is that # you are talking about? – Cloud Soh Jun Fu Commented Jun 25, 2020 at 13:54
• I'm running views on localhost:3000 because I'm using React, so to run my server that will be not interfering with app views I'm running server on another port (I've got proxy setup in package.json to operate this correctly. And I mentioned about # because in this case problem was solved by removing # manually. – yuna_nymphais Commented Jun 25, 2020 at 14:18

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 3

Try

req.query.email

Hope this solves your issue

There must be another problem in your code. Because i just tested as you did, totally same route.

router.get('/reset-pass', function (req, res) {
    console.log(req.url);
    console.log(req.query);
    res.json({
        url: req.url,
        query: req.query,
    });
});

Returns as:

{
    "url": "/reset-pass?email=anything",
    "query": {
        "email": "anything"
    }
}

And console.log as:

And it's ok. There is no problem with this operation. You should check other parts of your code.

I've figured out what was wrong.

Everything was perfectly fine with server. When I typed query in browser using server port, not client port (http://localhost:4001/reset-pass?email=anything), console.log in server terminal outputs everything correctly (as douscriptist said) or on page (e.g. using res.send()) it displays expected data.

The problem was with displaying URL parameters in React (in client view).

Trying to fetch data was just unnecessary in this case. I should have used React Router specifying routes like this:

App.js

<Router>
    <Switch>
        <Route exact path="/" ponent={Main} />
        <Route path="/reset-pass">
            <Route path="/:email" ponent={ResetPass} />
        </Route>
        <Route ponent={NoMatch} />
    </Switch>
</Router>

And then in ResetPass.js using match and location I'm able to display query parameters. For quick pars URL string I've added query-string module

ResetPass.js

import React, { Fragment } from "react";
import queryString from "query-string";

const ResetPass = ({ match, location }) => {
    console.log("MATCH", match);
    console.log("LOCATION", location);
    const parsed = queryString.parse(location.search);
    return (
        <Fragment>
            <p>Params: {parsed.email}</p> {/* => Params: anything*/}
        </Fragment>
    );
};

export default ResetPass;

So when I enter URL http://localhost:3000/reset-pass?email=anything, console.log (in browser) returns this:

MATCH {path: "/:email", url: "/reset-pass", isExact: true, params: {email: "reset-pass"}}
LOCATION {pathname: "/reset-pass", search: "?email=anything", hash: "", state: undefined}

I hope that I've explained everything correctly.

本文标签： javascriptExpress jscannot get query parameters from url (reqquery is an empty object)Stack Overflow