Syntax Error

A Syntax error is caused due to incorrect usage or a typo in your code.
Some examples include -

• Missing or invalid opening/closing Brackets [...], Parentheses (...) or Curly braces {...}

function printNum(num) {
  console.log(num);

• Missing or invalid semicolons " or colons '

console.log("Abhishek');

• Typo in variable name or function.

comst myName = "Abhishek";

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Reference Error

A Reference error occurs when a variable or a function is used that does not exist or is out of scope. For example -

• Accessing a variable before Declaring.

console.log(a);

• Accessing a variable before Initializing.

console.log(age);
let age = 23;

• Declaring a variable without a variable name in strict mode

"use strict"
age = 23;
console.log(age);

• Out of Scope variable

function getUserInfo() {
  const userName = "Abhishek";
}
console.log(userName);

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Type Error

Type error occurs when some value doesn’t turn out to be of a particular expected type. For example -

• Using String Upper/Lower Case operation on Integer

const age = 20;
console.log(age.toUpperCase());

• Calling variables as functions

let userInfo;
userInfo();

• Updating a value that cannot be changed

const num1 = 10;
num1 = 20;

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There are many ways an error can happen but these are some common types of errors and how they occur. Hope you learned something and thanks for reading.