Short and simple example on how to build a dynamic update query in SQL using JavaScript

dynamicUpdate.js

// data from database (illustration):
const selected = {
	nick: "bob",
	name: "Richard",
	surname: "Bach",
	address: "Somewhere"
};

// new input from client
let newInput = {
	nick: "Bobby",
	name: "Richard",
	surname: "Bacchus",
	address: "Somewhere"
};

/*
This is what it should end up as:
UPDATE users
SET email = ?, password = ?
WHERE id = ?
*/

// partial query build:
const part1 = "UPDATE users SET";
let part2 = "";
const part3 = "WHERE id = ?";

// placeholder for parameters:
let params = [];

// query builder:
for (let key in selected) {
	if (selected[key] != newInput[key]) {
		part2 += key + " = ?, ";
		params.push(key);
	}
}
params.push('id'); // ...and the tuple you want to update

// finished dynamic SQL query:
console.log(part1);
console.log(part2.substring(0,part2.length-2)); // snip last comma
console.log(part3);

// params to use:
console.log(params);

/*
Output:
UPDATE users SET
nick = ?, surname = ?
WHERE id = ?
[ 'nick', 'surname', 'id' ]
*/

// now input the update query into whatever API you use to communicate with your SQL database...