JSON to Query String Converter

About this calculator

A URL query string is the part after the “?” that passes key-value data to a web server, formatted as key=value pairs joined by “&” with special characters percent-encoded so they survive transmission safely. This tool takes a flat JSON object — one level deep, no nested objects or arrays — and converts each property into a properly percent-encoded key=value pair, joining them into a ready-to-use query string.

The conversion is a routine step for web developers and API integrators building or debugging HTTP GET requests, constructing shareable deep links, or converting a JSON config or form-state object into URL parameters for analytics tracking, redirect URLs or webhook callbacks. It saves the manual, error-prone work of percent-encoding each value by hand and remembering which characters (spaces, ampersands, equals signs) need escaping in a query string.