initial version with basic event utils.

handlers/EventSigning.jsx

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+import React from 'react'
+import {getEventHash, serializeEvent} from 'nostr-tools'
+
+import Item from '../components/item'
+
+export default function EventSigning({value}) {
+  let evt = JSON.parse(value)
+
+  return (
+    <>
+      <Item label="serialized event">{serializeEvent(evt)}</Item>
+      <Item label="event id" hint="sha256 hash of serialized">
+        {getEventHash(evt)}
+      </Item>
+    </>
+  )
+}
+
+EventSigning.match = value => {
+  try {
+    let evt = JSON.parse(value)
+    return evt.kind && evt.content && evt.tags
+  } catch (err) {
+    /**/
+  }
+  return false
+}

handlers/Nothing.jsx

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+import React from 'react'
+
+export default function Nothing() {
+  return (
+    <>
+      you can paste
+      <ul>
+        <li>an unsigned event to be hashed and signed</li>
+        <li>a signed event to have its signature checked</li>
+        <li>a nostr relay URL to be inspected</li>
+        <li>a nostr event id we'll try to fetch</li>
+        <li>a nip05 identifier to be checked</li>
+        <li>
+          contribute a new function:{' '}
+          <a
+            target="_blank"
+            style={{color: 'inherit'}}
+            href="https://github.com/fiatjaf/nostr-utils-web"
+          >
+            _______
+          </a>
+        </li>
+      </ul>
+    </>
+  )
+}
+
+Nothing.match = () => true