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What is difference between unescape() and escape() functions in JavaScript?
JavaScript provides two legacy functions for dealing with encoded strings: escape() and unescape(). The escape() function encodes a string, making certain characters safe for URLs, while unescape() decodes an encoded string back to its original form.
escape() and unescape() are deprecated. Use encodeURIComponent()/decodeURIComponent() or encodeURI()/decodeURI() instead.
Syntax
escape(string) unescape(encodedString)
Key Differences
| Function | Purpose | What it does |
|---|---|---|
escape() |
Encodes special characters | Converts characters like spaces, punctuation to %XX format |
unescape() |
Decodes encoded characters | Converts %XX sequences back to original characters |
Example: Basic Usage
Characters That Get Encoded
The escape() function encodes characters that are not alphanumeric or one of: * + - . / @ _
Modern Alternatives (Recommended)
Instead of deprecated escape() and unescape(), use these modern functions:
Why They're Deprecated
Limited character support: Only handles ASCII characters properly
Security concerns: Can lead to vulnerabilities when handling untrusted input
Browser inconsistencies: Not supported in all modern browsers
Better alternatives exist: URI encoding functions are more reliable and standards-compliant
Conclusion
While escape() and unescape() were once used for URL encoding, they're now deprecated. Use encodeURIComponent()/decodeURIComponent() for encoding URL parameters or encodeURI()/decodeURI() for full URLs instead.
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