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Query String Parser

Parse query strings into JSON key-value data.

Use the tool

Use Query String Parser to turn a raw query string into readable parameters before debugging analytics, redirects, filters, or API URLs.

Dev Workbench

Query String Parser

Parse query strings into JSON key-value data.

Input

Result

Run the tool to see output.
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Why use Query String Parser

  • Inspect UTM parameters from campaign links before launch or reporting.
  • Find duplicate keys, empty values, and malformed encoded data in a query string.
  • Decode nested return URLs and redirect parameters without manually splitting text.
  • Share a clean parameter table with developers, marketers, analysts, or support teams.

About this tool

Query parsing for UTM and link QA

Query String Parser separates parameter names and values so long tracking URLs become easier to inspect. It is built for campaign QA, redirect debugging, and analytics cleanup.

Find duplicated and empty parameters

A link can contain repeated keys, blank values, encoded separators, and nested URLs. Parsing the query string makes these issues visible before they reach analytics or routing code.

Decode before editing

Review decoded values before changing a query string. Encoded ampersands, equal signs, spaces, and nested URLs can change meaning if they are edited as raw text.

Example usage

Input

utm_source=newsletter&utm_medium=email&utm_campaign=spring-sale

Output

utm_source: newsletter\nutm_medium: email\nutm_campaign: spring-sale

Practical guide for Query String Parser

Best practices

  • Parse links before launching campaigns or changing redirects.
  • Check duplicate keys and empty values before analytics data is collected.
  • Decode nested URLs carefully so separators stay inside the intended value.

Common mistakes

  • Treating repeated parameters the same across all frameworks.
  • Editing a decoded nested URL without re-encoding it.
  • Putting query parameters after the fragment where servers may never see them.

How this tool works

  1. Step 1

    Open Query String Parser and review the default example input.

  2. Step 2

    Paste your own input or upload source data when required.

  3. Step 3

    Run Query String Parser to generate output instantly in the browser.

  4. Step 4

    Verify the output using the preview and formatting helpers on the page.

  5. Step 5

    Copy the final result and continue with a related tool if needed.

Use related links to continue your workflow and keep your output consistent across ToolHarbor pages.

JSON FormatterFormat JSON with readable indentation.Query String BuilderBuild query strings from key-value input.HTTP Header ParserParse raw HTTP headers into structured JSON.URL ParserParse a URL into protocol, host, path, and params.User Agent ParserParse user-agent strings into readable device data.

Continue exploring

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FAQ

What is a query string?

A query string is the part of a URL after the question mark that carries key-value parameters such as filters, IDs, and UTM tags.

Can this parse a full URL?

Use URL Parser for a full URL breakdown. Use Query String Parser when you want to focus on the parameter portion.

How does this help with UTM parameters?

It shows each UTM key and decoded value so you can spot typos, missing values, duplicate tags, and unexpected encoding.

What are duplicate query parameters?

Duplicate parameters use the same key more than once. Some systems keep the first value, some keep the last, and some treat them as arrays.