Query String Parser / Builder
Parse URL query parameters or build them from ordered JSON string pairs.
Free · No signup · No watermark · On-device processing
Use the tool
How to use Query String Parser / Builder
- For parsing, paste a query string; for building, enter JSON string pairs.
- Choose parse or build, then run the tool.
- Review repeated keys and the encoding of spaces before copying.
How this tool handles your input
Parsing produces an array of key/value pairs so repeated keys remain visible. Building uses application/x-www-form-urlencoded rules: a space becomes +.
Enter just the query string, not a full URL. Invalid JSON or non-string pairs are rejected in builder mode.
Example: [["q","hello world"],["tag","a"]] → q=hello+world&tag=a
Privacy and browser support
Your input is handled in this browser tab. Selected files and entered text are not sent to Varento Tools by this tool. Some specialized libraries load only when needed. A browser with JavaScript and sufficient device memory is required. Read our local-processing explanation.
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Frequently asked questions
Is this tool free without daily usage limits?
Yes. Varento Tools has no signup, accounts, usage-count caps, paywalls or watermarks. Device memory, format support and browser restrictions can still limit technically demanding files.
What input and output rules apply?
Parsing produces an array of key/value pairs so repeated keys remain visible. Building uses application/x-www-form-urlencoded rules: a space becomes +.
What are the limitations?
Enter just the query string, not a full URL. Invalid JSON or non-string pairs are rejected in builder mode.
Is my input uploaded?
No. This tool processes your input in the current browser tab, without a processing API or account.