Inspect URLs, build queries, and encode components.
Your input stays in this browser.
Starting points for your own code. Run them in the environment shown below.
Node.js 22+ · ES module (.mjs)
Current inputs apply only to fields used by the example. Selected files are not embedded.
Install dependencies
const url = new URL("https://example.com/search?q=hello&tag=web&tag=dev");
console.log(url.origin, url.pathname);
console.log([...url.searchParams.entries()]); // Keeps repeated keys
url.searchParams.set("page", "2");
url.searchParams.append("tag", "tools");
console.log(url.toString());
const encoded = encodeURIComponent("hello & 안녕");
console.log(encoded, decodeURIComponent(encoded));Inspect URLs, build queries, and encode components.
Use an array of key/value pairs to preserve repeated query parameters.
Text 1 MB
Split inputs that exceed the limit. If a format or algorithm is unsupported, choose a tool that matches your requirements instead of silently changing the format.