Write down user input in a text file - html

Question

i tryed it with a basic html code like :
<label for="fname">First name:</label><br>
<input type="text" id="fname" name="fname" value="John"><br>
<label for="lname">Last name:</label><br>
<input type="text" id="lname" name="lname" value="Doe"><br><br>
<input type="submit" value="Submit">
</form>
but then the input is saved like fname=John&lname=Doe
I wrote a script in python that gets the file xxx/xxx/display.txt
when i use the basic html input function, the text will get saved as fname =john & sname=rober
what i woud need is the string to get saved as john rober
how can i write the input down in the txt file without = and & , and how do i save it in the file, while overwriting everything previus in the txt file?

Answer 1

For that you need your js-code to be server side. I'd reccoment Node.js for that.
Than we need to format the input with js:
// Requiring fs module in which writeFile function is defined:
const fs = require('fs');
var fname = document.getElementById("fname").value;
var lname = document.getElementById("lname").value;
var fullname = fname + lname;
// data which will write in a file
let data = fullname;
// Write "data" in "file.txt":
fs.writeFile('file.txt', data, (err) => {
// In case of an error trhow err:
if (err) throw err;
})