<div class="nfaf-generated-content"><div class="nfaf-visual-card" style="--nfaf-accent:#11818b"><div class="nfaf-visual-icon" aria-hidden="true"><svg viewBox="0 0 64 64" role="img"><circle cx="32" cy="32" r="28" fill="currentColor" opacity=".12"></circle><path d="M20 34l8 8 17-19" fill="none" stroke="currentColor" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"></path></svg></div><div><strong>Query String Parser and Builder</strong><span>Browser-first utility with visible inputs, outputs, and limitations.</span></div></div><p class="nfaf-lede">This tool makes query parameters visible as rows and rebuilds them with standard component encoding.</p><p><strong>Designed for:</strong> Web developers and QA testers debugging links, filters, and API requests.</p><h2>How to use this tool</h2><p>Paste a full URL or query string to parse it, or add rows and build a query. Review repeated keys, blank values, and parameter order when comparing requests.</p><h2>How the result is produced</h2><p>The browser URL and URLSearchParams APIs parse and serialize the query component. Repeated keys remain repeated rather than being silently collapsed into one value.</p><h2>Test examples</h2><p>`?tag=red&tag=blue` contains two values for the same key. Spaces may be serialized as `+` by URLSearchParams, so compare decoded values rather than assuming one textual form is the only equivalent.</p><h2>Limitations</h2><p>The tool does not validate server routes, authentication, signatures, cache behavior, or whether a parameter is safe to expose in a URL. URLs can be recorded in history and logs.</p><h2>Privacy and processing</h2><p>Parsing and building happen in the browser. Avoid pasting tokens, personal data, or private query values into a public page.</p><h2>Related guide</h2><p><a href="https://nofyi.com/query-parameters-are-visible-data/">Query parameters are visible data, not a private channel</a></p><h2>Related tools in this category</h2><ul class="nfaf-related-tools"><li><a href="https://nofyi.com/tools/url-encoder-decoder/">URL Encoder and Decoder</a><span>Use this for query values and URL components, not for blindly re-encoding a complete URL.</span></li><li><a href="https://nofyi.com/tools/html-entity-encoder-decoder/">HTML Entity Encoder and Decoder</a><span>Convert text to safe visible entities or decode common entities back to characters.</span></li><li><a href="https://nofyi.com/tools/css-minifier-formatter/">CSS Minifier and Formatter</a><span>Paste CSS and choose a compact or readable output for inspection.</span></li></ul><h2>Documentation</h2><ul><li><a href="https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams" rel="nofollow noopener" target="_blank">https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams</a></li><li><a href="https://www.rfc-editor.org/rfc/rfc3986" rel="nofollow noopener" target="_blank">https://www.rfc-editor.org/rfc/rfc3986</a></li></ul><p class="nfaf-disclosure">This page describes the implementation shipped with the NOFYI Tool Factory. Review the interface output before using it in a production workflow.</p></div><div class="nfaf-app-slot">[nfaf_tool_app]</div>
