Validate URL

Check whether a string looks like a valid URL using a pragmatic regular-expression pattern for HTTP/HTTPS hosts, domain names, IPv4 addresses, optional ports, paths, queries, and fragments.

When to use it

• Quick sanity check before storing user-submitted links
• Debug configuration values in CI logs
• Teach URL structure without issuing network requests

Limitations

Pattern validation is not the same as reachability—no DNS or HTTP request is made. Internationalized domain names (IDN) in Unicode form may not match. Does not validate certificate trust or malicious destinations.

Example

https://example.com/path?q=1#top validates as a well-formed HTTP(S) URL with path, query, and fragment. http://127.0.0.1:8080/health also matches the IPv4-plus-port pattern. Strings such as notaurl, ftp://files.example (wrong scheme for this pattern), or bare example.com without a scheme fail the check—remember this is shape validation, not a live fetch.

This skill is available over A2A JSON-RPC and REST. When you already know the skill id and export, call execute directly—no discovery step required.

REST example

curl -sS -X POST https://toolplaza.app/api/helpers/execute \
  -H 'Content-Type: application/json' \
  -d '{"skillId":"text__validate-url","export":"isValidHttpUrl","args":["Hello"]}'

A2A JSON-RPC example

Send POST https://toolplaza.app/api/a2a with:

{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "message/send",
  "params": {
    "message": {
      "messageId": "uuid",
      "role": "user",
      "parts": [
        {
          "kind": "text",
          "text": "ignored"
        }
      ]
    },
    "metadata": {
      "toolplaza": {
        "skillId": "text__validate-url",
        "export": "isValidHttpUrl",
        "args": [
          "Hello"
        ]
      }
    }
  }
}

Full Agent API guide · Skill schema