Free Query String Parser & Builder
Quick Tips
- • This tool runs entirely in your browser - your data stays private.
- • Press Ctrl+V (Cmd+V on Mac) to quickly paste text.
- • Use the Copy button to save your result to clipboard.
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Parse and build URL query strings with proper encoding and formatting.
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Examples
?name=John%20Doe&city=New%20York&active=true
name = John Doe city = New York active = true
name=John Doe city=New York
name=John%20Doe&city=New%20York
?items[]=apple&items[]=banana&items[]=cherry
items[] = apple items[] = banana items[] = cherry
Why Use This Tool?
What problems does this solve?
Query strings can become complex with many parameters, encoding, and framework-specific syntax. This tool makes it easy to understand what data a URL contains and to construct proper query strings without manual encoding.
Common use cases:
- Debugging API requests by inspecting query parameters
- Building properly encoded URLs for web applications
- Analyzing tracking parameters in marketing URLs
- Understanding complex multi-parameter searches
- Converting between different query string formats
Who benefits from this tool?
API developers debugging request parameters. QA engineers testing URL handling. Marketers analyzing tracking URLs. Frontend developers building dynamic URLs.
Privacy first: All parsing happens locally in your browser. Your URLs and parameters never leave your device.
Frequently Asked Questions
URLs have practical limits of 2,000-8,000 characters depending on browser and server. Very long query strings should use POST requests instead. Most servers reject URLs over 8KB.
Common conventions include: repeated keys (key=1&key=2), bracketed keys (key[]=1&key[]=2), or indexed keys (key[0]=1&key[1]=2). The correct format depends on your server framework.
Spaces, &, =, ?, #, and non-ASCII characters must be encoded. Spaces can be + or %20. Best practice is to encode everything except alphanumerics and -_.~
Common issues: double-encoding (already encoded values being encoded again), missing URL encoding for special characters, or framework-specific array syntax that does not match your server.
Yes, and this is how simple arrays are passed (?color=red&color=blue). How your server handles duplicates varies - some keep only the last value, others create arrays.
Query strings (after ?) are sent to the server. Hash fragments (after #) are client-side only and not sent in HTTP requests. They are typically used for page navigation or JavaScript state.
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