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JSON to Form URL Encoded Converter - Online POST Body Builder

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JSON to Form URL Encoded Converter

Build application/x-www-form-urlencoded POST body from JSON payload. Supports nested objects & arrays.

JSON Input
URL Encoded Output

Frequently Asked Questions

It is the default content type for HTML form submissions. Data is encoded as key-value pairs separated by '&', with special characters percent-encoded. It's commonly used for POST requests and query strings.

Nested objects use square bracket notation. For example, {"user":{"name":"John"}} becomes user%5Bname%5D=John (user[name]=John when decoded). This is compatible with most server-side frameworks like PHP, Express.js, and Ruby on Rails.

Three styles are supported: Brackets (arr[]=a&arr[]=b), Indexed (arr[0]=a&arr[1]=b), and Repeat Key (arr=a&arr=b). Choose the one that matches your backend expectations. PHP typically uses brackets; some APIs expect indexed or repeated keys.

Yes! Click the Decode button to parse an existing URL-encoded string. The tool reconstructs nested objects and arrays intelligently, using the bracket/index notation to infer structure.

The tool runs entirely in your browser with no size limits besides your device's memory. Very large payloads (thousands of keys) may cause slight delays, but typical API bodies are handled instantly.
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