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Query String to JSON

Convert URL query parameters into JSON, preserving repeated names as arrays.

Convert in your browser · No sign-up

All values remain strings. Accepts an optional leading ?. Decodes percent escapes and treats + as a space.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Result

Add your input or load an example, then run the tool. Your result will appear here.

How to use

  1. Convert URL query parameters into JSON, preserving repeated names as arrays.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

tag=a&tag=b → {"tag":["a","b"]}

Details and limitations

Text stays in your browser; it is not sent to a conversion server.

Format references

Tool page updated: