URL Parameter Extractor & Editor
Paste any URL to parse its parameters, edit values inline, and reconstruct the final URL.
Example URLs
Click any card to load the example
About URL Parameter Extractor
URL query parameters are a core part of every web request — they carry search keywords, pagination state, filters, and more. This tool parses any URL into key-value pairs, lets you edit them inline, and reconstructs the final URL in real time.
For scraping engineers and API developers, this tool helps you quickly decode a target site's URL structure, understand each parameter's role, and efficiently build new request URLs.
How to Use
- Paste the target URL into the input box and click "Parse Parameters"
- Edit key names or values directly in the table — the reconstructed URL updates live
- Click "Copy URL" to grab the final reconstructed link
Typical Production Scenarios
Scraping Pagination Debugging
Extract page, size, offset, and other pagination parameters from a target site's search URL. Quickly tweak values to batch-generate paginated request URLs for automated scraping scripts.
API Filter Parameter Tuning
Parse filter, sort, order, and fields parameters from REST API requests. Adjust them one by one in the tool to observe response differences — far more efficient than hardcoding changes in your code.
Search Engine Link Analysis
Parse Google/Bing search result URLs to extract q (query), hl (language), num (results count), safe (safe search) parameters. Useful for SEO competitive analysis and search behavior reverse-engineering.
UTM Tracking Parameter Cleanup
Identify and strip utm_source, utm_medium, utm_campaign, and other tracking parameters from marketing URLs to obtain a clean destination URL — ideal for privacy cleanup before sharing links.
Array Parameter Construction & Validation
Manually add array-style parameters like category[]=backend&category[]=database to test how your backend handles PHP-style bracket notation and parameter binding.
OAuth Callback URL Parsing
Parse OAuth 2.0 callback parameters including code, state, scope, and error to quickly identify which step in the authorization flow failed and verify callback parameter completeness.
Deep Dive: URL Encoding & Parameter Security
URL query parameters may appear simple, but in production environments they involve encoding standards, security boundaries, and runtime differences. A small mistake can cause hard-to-trace bugs. Here are the key areas every DevOps engineer should understand.
encodeURI vs encodeURIComponent: One Wrong Choice Breaks Everything
JavaScript provides two encoding functions with very different purposes. encodeURI preserves URL structural characters like :/?#[]@!$&'()*+,;= and only encodes illegal characters. encodeURIComponent encodes everything except alphanumerics and -_.!~*'(). This tool uses encodeURIComponent for both key and value when reconstructing the URL, ensuring no special characters can break the query string structure. If you're manually building URLs, always use encodeURIComponent for parameter values — using encodeURI instead will leave & and = unencoded, splitting your parameters apart.
The Double-Encoding Trap
Re-encoding an already-encoded URL is a common and costly mistake. For example, %20 gets encoded again to %2520 (the % becomes %25). A typical scenario: copying a URL from the browser address bar — modern browsers may display decoded Chinese characters in the address bar, but the clipboard still contains the encoded form. This tool uses the URL constructor for parsing, which decodes once automatically and re-encodes when reconstructing, naturally avoiding double-encoding. If your pipeline has multiple encode/decode stages, verify at each layer that parameters haven't been accidentally re-escaped.
Security Boundary: Never Trust User-Provided URLs
All parsing in this tool is browser-side — no data is ever sent to any server. However, when using parsed results in your own production code, be aware: parameter values can contain malicious content such as javascript: pseudo-protocols, CRLF injection characters (%0d%0a), or excessively long strings for DoS. Never interpolate URL parameter values directly into HTML, SQL, or shell commands. For values that need storage or forwarding, apply whitelist validation first, then choose your encoding strategy based on the downstream context.
Common Mistake Patterns
Forgetting to encode during manual concatenation
Concatenating a value containing & directly into a URL string → one parameter gets split into two. Use encodeURIComponent or let this tool handle encoding.
Confusing encodeURI with encodeURIComponent
Using encodeURI for a parameter value → characters like ?&=# remain unencoded, destroying the query structure. Always use encodeURIComponent for parameter values.
Re-encoding an already-encoded URL
Applying encoding to a URL that already contains %XX sequences → % becomes %25, irreversibly bloating parameter values. Decode first to confirm the original content, then decide if re-encoding is needed.
Ignoring empty-parameter edge cases
Some backends treat ?key and ?key= differently — the former produces a null value, the latter an empty string. Be explicit about expected behavior when constructing test URLs.