Start & End Checking in JavaScript
From the JavaScript String Methods cheat sheet · Searching & Testing · verified Jul 2026
Start & End Checking
Check if strings start or end with specific substrings
javascript
// Check string start
const str = 'JavaScript is awesome'
console.log(str.startsWith('Java')) // true
console.log(str.startsWith('Script', 4)) // true (start from index 4)
// Check string end
console.log(str.endsWith('awesome')) // true
console.log(str.endsWith('is', 13)) // true (check up to position 13)💡 More readable than indexOf() === 0 or slice() checks
⚡ Second parameter specifies search position
📌 Case-sensitive by default - lowercase for case-insensitive
✅ Perfect for validation and conditional logic
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