% URL encoder
Reference
Always safe (never encoded)
A–Z a–z 0–9 - _ . ! ~ * ' ( )
Common encodings
→ %20& → %26= → %3D+ → %2B/ → %2F? → %3F# → %23@ → %40: → %3A
When to use which
encodeURIComponent — single param values
encodeURI — full URLs, preserve structure
query string — encode entire query string