JavaScript Internals (521 Qs)•Part 3: DOM, Event Flow, Timers & Browser APIs (104 - 173)
Is it recommended to use eval
No, it allows arbitrary code to be run which causes a security problem. As we know that the eval() function is used to run text as code. In most of the cases, it should not be necessary to use it.
Practical Code Example
javascript
// Why eval() is strongly discouraged:
// 1. Severe Security Risk (Code Injection / XSS)
// 2. Performance degradation: V8 engine cannot optimize code containing eval()
// Bad:
// eval('var result = ' + userInput);
// Good:
const safeResult = JSON.parse('{"value": 42}');
console.log(safeResult.value);