html to plaintext with NodeJS on server side - html

Question

on the server-side, using Nodejs. I receive a text message containing HTML. I want a function that converts the html to plain text. And please don't tell me to add the tag <plaintext> or <pre>. (convert_to_html function doesn't exist in nodejs)
socket.on('echo', (text) => {
plaintext = convert_to_html(text);
socket.emit('echo', {
message: plaintext
});
});
ideal results:
input: <h1>haha i am big</h1>
plaintext(what i want plaintext to be): <h1 &60;haha i am big </h1 &60;
output: <h1>haha i am big</h1>
current result:
input: <h1>haha i am big</h1>
plaintext: <h1>haha i am big</h1>
output: haha i am big

Answer 1

You can use the insertAdjacementHTML method on the browser side, here you go an example
socket.on("response", function (msg) {
const messages = document.getElementById("messages");
messages.insertAdjacentHTML("beforebegin", msg);
window.scrollTo(0, document.body.scrollHeight);
});

Answer 2

still don't have a proper solution. while i wait for one, i will use reserved characters as a temporary solution.
https://devpractical.com/display-html-tags-as-plain-text/#:~:text=You%20can%20show%20HTML%20tags,the%20reader%20on%20the%20browser.
function parse_to_plain_text(html){
var result = "";
for (var i = 0; i < html.length; i++) {
var current_char = html[i];
if (current_char == ' '){
result += " "
}
else if (current_char == '<'){
result += "<"
}
else if (current_char == '>'){
result += ">"
}
else if (current_char == '&'){
result += "&"
}
else if (current_char == '"'){
result += """
}
else if (current_char == "'"){
result += "&apos;"
}
else{
result += current_char;
}
}
return result;
}