JSON to Query String

Convert a JSON object into a query string

Turning a JSON object into a URL query string means encoding each key and value correctly, and this tool does it. It converts a JSON object into a URL query string with proper encoding, supporting nested and array values.

Why proper encoding matters

A query string appends parameters to a URL, and each key and value must be percent-encoded so that spaces, special characters and reserved symbols do not break the URL or change its meaning. Building this by hand from an object is error-prone, and nested objects and arrays need conventions for how they flatten into parameters. The tool handles the encoding and the flattening, producing a valid query string from your JSON. This is the reverse of parsing a query string, and it is exactly what you need when constructing a URL programmatically from structured data.

A valid query string

It runs entirely in your browser, so nothing you paste is uploaded and the result is yours to copy straight into a project, which lets you work on private code and data without anything leaving your machine.

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