The REST API endpoint builder constructs API URLs with proper query parameter encoding. Add path segments and key-value query parameters, then copy the fully encoded URL ready to use in curl, Postman, or your code.
How to Build REST API Endpoints
REST APIs use URLs to identify resources and query parameters to filter or modify responses. The endpoint builder handles proper percent-encoding of parameter values, ensuring spaces, special characters, and Unicode are correctly escaped.
URL Structure
A REST URL has: protocol (https://), host (api.example.com), path (/v1/users/123), and optional query string (?page=2&status=active). Path segments identify the resource; query parameters modify how the resource is returned (filtering, pagination, sorting).
Frequently Asked Questions
Is this API endpoint builder free?
Yes, completely free with no signup required. All URL construction runs locally in your browser.
How are query parameters encoded?
Query parameter values are percent-encoded using encodeURIComponent(), which encodes spaces as %20, special characters like &, =, +, and /, and all non-ASCII characters. This follows RFC 3986 for safe URL encoding.
When should I use query parameters vs path segments?
Use path segments (/users/123) for identifying specific resources. Use query parameters (?page=2&limit=20) for filtering, sorting, pagination, and optional parameters. REST convention: /users/123/orders?status=pending.
What is URL encoding?
URL encoding (percent encoding) replaces characters that aren't valid in URLs with a percent sign followed by two hexadecimal digits. For example, a space becomes %20, & becomes %26, and # becomes %23.
Can I add authentication headers?
This tool builds the URL only — it does not add request headers or authentication. To test the built URL with authentication, paste it into a tool like Postman, HTTPie, or curl with your authorization header.