initial version with basic event utils.

.eslintrc.json

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+{
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "sourceType": "module",
+    "allowImportExportEverywhere": false
+  },
+
+  "env": {
+    "es6": true,
+    "node": true
+  },
+
+  "plugins": [
+    "react",
+    "babel"
+  ],
+
+  "globals": {
+    "document": false,
+    "navigator": false,
+    "window": false,
+    "location": false,
+    "URL": false,
+    "URLSearchParams": false,
+    "fetch": false,
+    "EventSource": false,
+    "localStorage": false,
+    "sessionStorage": false
+  },
+
+  "rules": {
+    "react/jsx-uses-vars": 2,
+    "react/jsx-no-undef": 2,
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+    "indent": 0,
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+    "semi": [2, "never"],
+    "semi-spacing": [2, { "before": false, "after": true }],
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+    "yoda": 0,
+    "no-unsafe-optional-chaning": 0
+  }
+}

.gitignore

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+node_modules
+public/app.js
+yarn.lock

.prettierrc.yaml

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+arrowParens: avoid
+bracketSpacing: false
+jsxBracketSameLine: false
+printWidth: 80
+proseWrap: preserve
+semi: false
+singleQuote: true
+trailingComma: none
+useTabs: false

app.jsx

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+import React, {useState} from 'react'
+import {render} from 'react-dom'
+
+import Nothing from './handlers/Nothing'
+import EventSigning from './handlers/EventSigning'
+
+const handlers = [EventSigning, Nothing]
+
+function App() {
+  let [value, setValue] = useState(null)
+
+  let Result
+  for (let i = 0; i < handlers.length; i++) {
+    let alt = handlers[i]
+    if (alt.match(value)) {
+      Result = alt
+      break
+    }
+  }
+
+  return (
+    <main style={{fontFamily: 'monospace'}}>
+      <div
+        style={{
+          width: '90%',
+          margin: 'auto'
+        }}
+      >
+        <h1>nostr army knife</h1>
+        paste something nostric
+        <textarea
+          onChange={e => setValue(e.target.value)}
+          style={{
+            padding: '7px',
+            width: '100%',
+            minHeight: '200px'
+          }}
+        />
+      </div>
+      <hr style={{margin: '18px 0'}} />
+      <div
+        style={{
+          width: '90%',
+          margin: 'auto'
+        }}
+      >
+        <Result value={value} />
+      </div>
+    </main>
+  )
+}
+
+render(<App />, document.getElementById('app'))

build.js

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+#!/usr/bin/env node
+
+const esbuild = require('esbuild')
+const alias = require('esbuild-plugin-alias')
+const nodeGlobals = require('@esbuild-plugins/node-globals-polyfill').default
+
+const prod = process.argv.indexOf('prod') !== -1
+
+esbuild
+  .build({
+    bundle: true,
+    entryPoints: ['app.jsx'],
+    outdir: 'public',
+    plugins: [
+      alias({
+        stream: require.resolve('readable-stream')
+      }),
+      nodeGlobals({buffer: true})
+    ],
+    sourcemap: prod ? false : 'inline',
+    define: {
+      window: 'self',
+      global: 'self'
+    }
+  })
+  .then(() => console.log('build success.'))

components/item.jsx

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+import React from 'react'
+
+export default function Item({label, children}) {
+  return (
+    <div
+      style={{
+        marginBottom: '9px',
+        whiteSpace: 'pre-wrap',
+        wordWrap: 'break-word',
+        wordBreak: 'break-all'
+      }}
+    >
+      <b>{label}: </b>
+      {children}
+    </div>
+  )
+}

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

package.json

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+{
+  "dependencies": {
+    "@esbuild-plugins/node-globals-polyfill": "^0.1.1",
+    "esbuild": "^0.14.21",
+    "esbuild-plugin-alias": "^0.2.1",
+    "events": "^3.3.0",
+    "nostr-tools": "^0.21.4",
+    "react": "^17.0.2",
+    "react-dom": "^17.0.2"
+  },
+  "scripts": {
+    "build": "./build.js prod",
+    "watch": "ag -l --js | entr ./build.js"
+  }
+}

public/index.html

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+<meta charset="utf-8" />
+<title>nostr utils</title>
+<div id="app" />
+<script src="app.js"></script>