ReactJs, Express and Axios, send request to server then respond to client - reactjs

Question

I have a question how to send "params" value to express server. The respond from server to client will not be a big problem because I done the respond. I have problem with sending data to server.
this is my server.js file
const express = require('express');
const axios = require('axios');
const app = express();
const port = process.env.PORT || 5000;
const cors = require('cors');
var bodyParser = require('body-parser')
var urlencodedParser = bodyParser.urlencoded({ extended: false })
app.get('/category', (req, res) => {
axios.get(`https://newsapi.org/v2/${params}&language=pl&sortBy=publishedAt&apiKey=API`)
.then(response =>{
let articles = [];
response.data.articles.map((article) =>{
articles.push(article);
})
res.send({ articles});
});
})
app.listen(port, () => console.log(`Listening on port ${port}`));
and here is my app.js
//make api request
setApiKey = params => {
this.setState(
{
apiKey: api,
},
this.makeApiRequest,
);
return api;
}
//set state after request
makeApiRequest = () =>{
axios.get('/category')
.then(response => {
this.setState({articles: response.data.articles});
})
}
//set new api on input chnage
switchOnInputChange=(event)=>{
if(event.target.value.length >3) {
let params = `everything?q=${event.target.value}`
this.setApiKey(params);
this.setState({headerText: "Popularne"},
this.makeApiRequest,
)
}
if (event.target.value.length < 3){
this.setState({
apiKey: apiTop,
headerText: "Popularne"
},
this.makeApiRequest,);
}
}
scrollOnBtnClick = () =>{
this.smoothScrollTo(0, window.outerHeight, 1500);
this.toggleNav();
}
//change api on click
switchCatOnClick = (event) =>{
let text = event.target.innerText;
let params = `top-headlines?country=us&category=${event.target.getAttribute("switch")}`
this.setApiKey(params);
this.smoothScrollTo(0, window.outerHeight, 1500);
this.setText(text);
}
as You can see I want to pass params which are created on click or input change.

Answer 1

Working solution:
server.js
app.get('/category', (req, res) => {
axios.get(`https://newsapi.org/v2/${req.query.path}?country=${req.query.country}&category=${req.query.category}&apiKey=API_KEY`)
.then(response =>{
let articles = [];
response.data.articles.map((article) =>{
articles.push(article);
})
res.send({ articles});
});
})
app.js
switchCatOnClick = (event) =>{
let text = event.target.innerText;
let params = `path=top-headlines&country=pl&category=${event.target.getAttribute("switch")}`
this.callApi(`/category?${params}`)
.then(response => {
this.setState({
articles: response.articles
});
});
this.smoothScrollTo(0, window.outerHeight, 1500);
this.setText(text);
this.scrollOnBtnClick();
this.toggleNav
}