URL Parser & Query String Builder

When you need to parse a URL

• Debug UTM tracking: ?utm_source=newsletter&utm_campaign=launch — verify each parameter.
• Build API URLs: add/remove query params dynamically — no manual string concat.
• Analyse affiliate links: Shopee/Lazada/Amazon links carry many tracking params — see what each one does.
• OAuth callbacks: redirect_uri has hash params — split to extract the token.
• SEO audits: detect URLs with redundant tracking params, suggest a canonical.

Standard URL structure

https://user:pass@example.com:8080/path/to/page?key=value&q=hello#section
└─┬─┘   └────┬────┘ └────┬────┘ └─┬┘ └──────┬──────┘ └──────┬───────┘ └───┬──┘
protocol     auth        host    port      path           query         hash

Query string encoding tips

• Space: encoded as %20 or + (equivalent in query strings).
• Non-ASCII characters: must be UTF-8 percent-encoded. E.g. café → caf%C3%A9.
• Special characters: &, =, ?, # inside values must be encoded so they aren't mistaken for separators.
• The tool uses URLSearchParams.toString() — encoding is automatic and standards-compliant.