Convert tools

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.

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

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

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

FAQ

Query String to JSON — What are the supported inputs and limits?

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

Format references

Tool page updated: