A
AiTechWorlds
AiTechWorlds
Convert JSON to a URL query string (with nested bracket notation) and back, bidirectionally.
q=shoes&page=2&filter%5Bcolor%5D=red&tags%5B0%5D=new&tags%5B1%5D=sale
100% in-browser. JSON→QS flattens nested objects/arrays to bracket notation (a[b][0]=…) and URL-encodes values; QS→JSON groups repeated keys into arrays.
The JSON ↔ Query String tool converts a JSON object into a URL query string (flattening nested objects and arrays to bracket notation and URL-encoding values) and parses query strings back into JSON, grouping repeated keys into arrays. It runs entirely in your browser.
Pick a direction
JSON → query string, or query string → JSON.
Paste input
Enter JSON or a query string (with or without the leading ?).
Copy
Copy the converted output.
100% Private — No Server Required
All processing happens directly in your browser. No data is uploaded, stored, or transmitted to any server.
Last reviewed on June 24, 2026 by the AiTechWorlds Tools Team. All processing runs locally in your browser.
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