DevToolBox

Query String Builder

Generate perfectly encoded URL parameters.

Developer tool

Query String Builder

Convert a JSON object into a URL-encoded query string.

Overview

What is Query String Builder?

Manually building a long query string is prone to encoding errors. Our builder provides an interface to add keys and values, automatically handling the percent-encoding for you. It ensures your URLs remain valid even when they contain spaces, ampersands, or other special characters.

Use cases

When to use Query String Builder?

Constructing test URLs for API endpoints
Generating UTM links for marketing campaigns
Building dynamic search queries for web applications
Ensuring special characters are correctly encoded in URLs