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HTTP Query String Builder

Build, parse, and encode URL query strings with support for multiple array formats (brackets, indices, repeat, comma). Parse existing URLs to extract parameters. Real-time encoding/decoding with sort and skip-empty options. Runs entirely in your browser — your data never leaves your machine.

query-string url http params encoding builder parser

Published June 1, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Build URL query strings from key-value pairs with configurable encoding and array formatting. Parse existing query strings or full URLs to extract and inspect parameters. All processing runs entirely client-side.

Features

  • Build query strings: add/remove key-value parameters with real-time preview
  • 4 array formats: brackets (key[]=val), indices (key[0]=val), repeat (key=val), comma (key=a,b)
  • URL encoding: toggle RFC 3986 percent-encoding on/off
  • Sort keys: alphabetically sort parameters
  • Skip empty: filter out parameters with empty values
  • Parse URLs: paste a query string or full URL to extract parameters
  • Load into builder: one-click transfer from parser to builder
  • Full URL preview: combine base URL with query string
  • Copy support: one-click copy for query string or full URL
  • Private: runs entirely in the browser — no data transmitted

Use Cases

  • API development: construct query strings for REST API requests
  • URL debugging: parse and inspect URL parameters
  • Testing: generate encoded URLs for test cases
  • Documentation: create properly encoded example URLs
  • Migration: convert between array format conventions