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Query String Parser

Query String Parser

Parse URL query strings into structured JSON key-value objects with automatic percent-decoding and array parameter handling.

Conversion Direction:
Auto Coerce Numbers & Booleans (Query ➔ JSON):
Array Serialization Style (JSON ➔ Query):
Valid Syntax

Quick Answer & Understanding Your Result

Source: WHATWG URL Living Standard - URLSearchParams

A Query String Parser transforms URL query parameter strings (`?key=value&arr[]=1&arr[]=2`) into structured, formatted JSON key-value objects, handling percent-decoding and nested arrays.

Core Query String Parsing Capabilities

  • URL Parameter Extraction: Strips leading ? or # symbols and parses ampersand-separated pairs.
  • Percent-Decoding: Automatically decodes %20, %26, and plus signs (+) into natural plain text.
  • Array & Nested Object Handling: Automatically groups duplicate keys or bracket notations (tags[]=a&tags[]=b) into clean JSON arrays.

API & Web Analytics Applications

  • UTM Campaign Parameter Auditing: Inspecting marketing campaign tracking parameters (utm_source, utm_medium).
  • REST API Query Debugging: Inspecting received GET query parameters in API route handlers.

Paste a URL or query string above to convert parameters into JSON instantly.

Formula & Calculation Logic

Technical Specification & AST
Mathematical Formula
JSON Object
= Object.fromEntries(new URLSearchParams(queryString))

Query string parsing pipeline:

  • Parses key-value pairs via WHATWG URLSearchParams API and constructs a structured JavaScript dictionary.

Step-by-Step Guide

1

Paste URL or Query String

Paste full URL or parameters (e.g. ?q=react&page=2&filter=active).

2

Deterministic Query Parsing

The engine decodes parameters into a structured JSON tree in 0ms.

3

Copy Clean JSON

Copy structured JSON object for your code or API payload.

Worked Examples Table

ExampleInput ValuesCalculated ResultExplanation
UTM Parameters to JSON
Input Text: https://fnct.net?utm_source=google&utm_medium=cpc&utm_campaign=summer_sale, Mode: query_to_json, Parse Types: true, Array Format: brackets
{ "utm_source": "google", "utm_medium": "cpc", "utm_campaign": "summer_sale" }
Extracted UTM tracking parameters into clean JSON.
JSON Object to Encoded Query String
Input Text: { "query": "nextjs developer tools", "page": 1, "limit": 50, "verified": true, "tags": ["tools", "developer", "2026"] }, Mode: json_to_query, Parse Types: true, Array Format: brackets
Accurate Operational Result
Provides instant quantitative evaluation for comparative practical analysis.

Frequently Asked Questions

Evidence-Based Methodology & Authoritative References

References & Methodology

WHATWG URL Living Standard - URLSearchParams

View Reference

IETF RFC 3986 - URI Generic Syntax §3.4 Query

View Reference
Calculation Standard & Formulation

Standard: ISO / W3C / IETF Authoritative Domain Standard

Formula: JSON Object = Object.fromEntries(new URLSearchParams(queryString))

Last Reviewed: August 21, 2026

Authoritative Sources & Peer Review

Primary Source: WHATWG URL Living Standard - URLSearchParams

Reference Document: IETF RFC 3986 - URI Generic Syntax §3.4 Query

Computation Privacy: 100% client-side 0ms computation, zero data retention

Technical Standards & Execution Scope

All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.

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