JavaScript Engine ek computer program hota hai jo JavaScript code ko samajhne aur execute karne ke liye banaya jata hai. Ye engine web browsers jaise Google Chrome, Firefox, Safari, etc. ke andar hota hai aur web pages par JavaScript code ko chalata hai.
JavaScript engine ka kaam hota hai ki jab browser me koi webpage load hoti hai jisme JavaScript code likha gaya ho to vo engine us code ko padhta hai aur use machine language me convert karta hai jo ki computer samajh sakte hai. Is process ko "compilation" kehte hai.
Ek example ke roop me, Google Chrome ka V8 JavaScript engine bahut popular hai. Ye engine Node.js, Electron aur nw.js jaise tools ke saath bhi istemaal kiya ja sakta hai. Ye engine JavaScript code ko optimized tarike se compile karta hai, jisse ki code ki speed improve ho aur execution time kam ho.