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Query String Parser: Decode URL Parameters

This free query string parser splits a URL or query string into its parameters, decodes percent-encoding and plus signs, shows repeated keys and gives the same data as JSON.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

URLs hide a lot of data in their parameters. Tracking links, search results and API calls pack many values into one long string, with percent codes that are hard to read.

Paste the URL and see each parameter on its own row.

How to Use This Tool

  1. Paste a full URL or just the query part.
  2. Press Parse.
  3. Read the table of keys and values.
  4. Copy the JSON if you need it.

How the Calculation Works

The text before the question mark is the address, and the text after the hash is the fragment. The rest is split on ampersands and equals signs. Each key and value is decoded with percent-decoding, and plus signs become spaces.

Worked Example

?q=hello+world&tag=a&tag=b gives q = hello world and tag = a, b.

Common Uses

  • Reading tracking links with UTM tags.
  • Debugging API calls.
  • Checking redirects.
  • Cleaning shared links.

Tips and Common Mistakes

  • Look for unexpected tracking parameters.
  • A value with an equals sign is split at the first one.
  • Invalid percent codes are left as they are.

Next, you may need the SQL IN clause generator, string escape tool, JSON to TypeScript, ASCII table.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

The part of a URL after the question mark, made of key=value pairs joined with ampersands.
As a plus sign or as %20. The parser turns both back into spaces.
A key can appear several times, such as tag=a&tag=b. The parser keeps every value in order.
The fragment after the hash is shown separately because it is not sent to the server.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.