jwt-playground/index.html at main · 5kr1pt/jwt-playground · GitHub

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<!--
 ===================
Paulo "5kr1pt" Werneck
pgwerneck5@outlook.com
JWT Playground – v2.1
=====================
-->

<!DOCTYPE html>
<html lang="pt-BR">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>JWT – Encode/Decode</title>
  <!-- Tailwind via CDN -->
  <script src="https://cdn.tailwindcss.com"></script>
  <!-- Crypto‑JS para assinatura HS* -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.2.0/crypto-js.min.js"></script>
  <!-- jsrsasign para assinatura RS256 -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jsrsasign/10.5.23/jsrsasign-all-min.js"></script>
</head>
<body class="bg-zinc-900 text-zinc-100 min-h-screen flex flex-col p-4 gap-6">

  <!-- HEADER -->
  <header class="text-center">
    <h1 class="text-4xl font-bold mb-1">JWT Playground</h1><i>by Krpt<i>
    <p class="text-sm text-zinc-400">Encode, decode, editar claims e renovar tempos – tudo localmente.</p>
  </header>

  <!-- MAIN -->
  <main class="grid lg:grid-cols-2 gap-6 flex-1">

    <!-- DECODE -->
    <section class="bg-zinc-800 rounded-2xl shadow-lg p-6 flex flex-col gap-4">
      <h2 class="text-xl font-semibold">Decode</h2>
      <textarea id="tokenInput" placeholder="Cole aqui seu JWT…" rows="4"
        class="w-full bg-zinc-900 rounded-xl p-3 text-sm font-mono"></textarea>
      <button class="bg-lime-600 hover:bg-lime-700 rounded-xl py-2" onclick="decodeToken()">Decodificar</button>
      <div class="grid md:grid-cols-2 gap-4">
        <div>
          <label class="text-zinc-400 text-xs">Header (JSON)</label>
          <textarea id="headerOut" readonly rows="6"
            class="w-full bg-zinc-900 rounded-xl p-3 text-xs font-mono"></textarea>
        </div>
        <div>
          <label class="text-zinc-400 text-xs">Payload (JSON)</label>
          <textarea id="payloadOut" readonly rows="6"
            class="w-full bg-zinc-900 rounded-xl p-3 text-xs font-mono"></textarea>
        </div>
      </div>
      <div>
        <label class="text-zinc-400 text-xs">Assinatura (base64url)</label>
        <input id="signatureOut" readonly class="w-full bg-zinc-900 rounded-xl p-3 text-xs font-mono" />
      </div>
      <div class="flex gap-2">
        <button class="bg-indigo-600 hover:bg-indigo-700 rounded-xl py-1 px-3 text-sm" onclick="cloneJson()">Clone JSON → Encode</button>
        <button class="bg-indigo-600 hover:bg-indigo-700 rounded-xl py-1 px-3 text-sm" onclick="cloneRaw()">Clone Raw → Encode</button>
      </div>
    </section>

    <!-- ENCODE -->
    <section class="bg-zinc-800 rounded-2xl shadow-lg p-6 flex flex-col gap-4">
      <h2 class="text-xl font-semibold">Encode / Sign</h2>
      <div class="flex items-center gap-4">
        <label><input type="radio" name="mode" value="json" checked onchange="setMode('json')" /> JSON</label>
        <label><input type="radio" name="mode" value="raw" onchange="setMode('raw')" /> Raw</label>
      </div>
      <div id="jsonInputs" class="grid md:grid-cols-2 gap-4">
        <div>
          <label class="text-zinc-400 text-xs">Header (JSON)</label>
          <textarea id="headerIn" rows="6"
            class="w-full bg-zinc-900 rounded-xl p-3 text-xs font-mono"
            placeholder='{"alg":"HS256","typ":"JWT"}'></textarea>
        </div>
        <div>
          <label class="text-zinc-400 text-xs">Payload (JSON)</label>
          <textarea id="payloadIn" rows="6"
            class="w-full bg-zinc-900 rounded-xl p-3 text-xs font-mono"
            placeholder='{"sub":"123","iat":...}'></textarea>
        </div>
      </div>
      <div id="rawInputs" class="grid md:grid-cols-2 gap-4 hidden">
        <div>
          <label class="text-zinc-400 text-xs">Header (Base64URL)</label>
          <textarea id="headerRawIn" rows="2"
            class="w-full bg-zinc-900 rounded-xl p-3 text-xs font-mono"></textarea>
        </div>
        <div>
          <label class="text-zinc-400 text-xs">Payload (Base64URL)</label>
          <textarea id="payloadRawIn" rows="2"
            class="w-full bg-zinc-900 rounded-xl p-3 text-xs font-mono"></textarea>
        </div>
      </div>
      <div class="grid md:grid-cols-2 gap-4 items-end">
        <div>
          <label class="text-zinc-400 text-xs">Segredo (HS256)</label>
          <input id="secretIn" type="password"
            class="w-full bg-zinc-900 rounded-xl p-3 text-sm font-mono"
            placeholder="opcional – vazio → none" />
        </div>
        <div class="md:col-span-2">
          <label class="text-zinc-400 text-xs">Chave privada (RS256)</label>
          <textarea id="privateKeyIn" rows="4"
            class="w-full bg-zinc-900 rounded-xl p-3 text-xs font-mono"
            placeholder="Cole se quiser assinar, opcional"></textarea>
        </div>
        <button class="bg-indigo-600 hover:bg-indigo-700 rounded-xl py-2" onclick="encodeToken()">Gerar JWT</button>
      </div>
      <div class="flex flex-col gap-2">
        <div class="flex gap-2">
          <input id="setInput" class="flex-1 bg-zinc-900 rounded-xl p-2 text-sm font-mono"
            placeholder="sub=1 role=admin (space‑separated)" />
          <button class="bg-indigo-600 hover:bg-indigo-700 rounded-xl py-1 px-3 text-sm" onclick="applySets()">Aplicar</button>
        </div>
        <div class="flex gap-2 items-center">
          <input id="lifetimeIn" type="number" value="3600"
            class="w-24 bg-zinc-900 rounded-xl p-2 text-sm font-mono" />
          <span class="text-xs text-zinc-400">lifetime (segundos)</span>
          <button class="bg-indigo-600 hover:bg-indigo-700 rounded-xl py-1 px-3 text-sm" onclick="applyRefresh()">Refresh times</button>
        </div>
      </div>
      <label class="text-zinc-400 text-xs">Token gerado</label>
      <textarea id="tokenOut" readonly rows="4"
        class="w-full bg-zinc-900 rounded-xl p-3 text-sm font-mono"></textarea>
    </section>

  </main>

  <!-- FOOTER -->
  <footer class="text-center text-xs text-zinc-500">
    Feito para estudos de segurança ofensiva · Tudo roda localmente ·
    <a href="https://github.com/5kr1pt/jwt-playground" class="underline" target="_blank">GitHub</a>
  </footer>

  <script>
    // util base64url
    const b64UrlDecode = str => {
      str = str.replace(/-/g, '+').replace(/_/g, '/');
      while (str.length % 4) str += '=';
      try {
        return decodeURIComponent(atob(str).split('').map(c => '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)).join(''));
      } catch {
        return null;
      }
    };
    const b64UrlEncode = str =>
      btoa(unescape(encodeURIComponent(str))).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');

    // state
    let originalHeaderJson = '', originalPayloadJson = '', originalHeaderB64 = '', originalPayloadB64 = '';
    let encodeMode = 'json';

    // switch mode
    function setMode(m) {
      encodeMode = m;
      document.getElementById('jsonInputs').classList.toggle('hidden', m !== 'json');
      document.getElementById('rawInputs').classList.toggle('hidden', m !== 'raw');
    }

    // decode
    function decodeToken() {
      const token = document.getElementById('tokenInput').value.trim();
      const parts = token.split('.');
      if (parts.length < 2) return alert('Token inválido');
      [originalHeaderB64, originalPayloadB64] = parts;
      const hJson = b64UrlDecode(parts[0]), pJson = b64UrlDecode(parts[1]);
      originalHeaderJson = hJson; originalPayloadJson = pJson;
      try { document.getElementById('headerOut').value = JSON.stringify(JSON.parse(hJson), null, 2); } catch { document.getElementById('headerOut').value = 'JSON inválido'; }
      try { document.getElementById('payloadOut').value = JSON.stringify(JSON.parse(pJson), null, 2); } catch { document.getElementById('payloadOut').value = 'JSON inválido'; }
      document.getElementById('signatureOut').value = parts[2] || '';
    }

    // clone
    function cloneJson() {
      if (!originalHeaderJson) return;
      document.getElementById('headerIn').value = JSON.stringify(JSON.parse(originalHeaderJson), null, 2);
      document.getElementById('payloadIn').value = JSON.stringify(JSON.parse(originalPayloadJson), null, 2);
      setMode('json');
    }
    function cloneRaw() {
      if (!originalHeaderB64) return;
      document.getElementById('headerRawIn').value = originalHeaderB64;
      document.getElementById('payloadRawIn').value = originalPayloadB64;
      setMode('raw');
    }

    // batch set
    function applySets() {
      let payload;
      try {
        payload = JSON.parse(encodeMode === 'json' ? document.getElementById('payloadIn').value : JSON.parse(b64UrlDecode(originalPayloadB64)));
      } catch {
        return alert('Payload JSON inválido');
      }
      document.getElementById('setInput').value.trim().split(/\s+/).forEach(pair => {
        const [k, v] = pair.split('=');
        if (k) payload[k] = v;
      });
      if (encodeMode === 'json') {
        document.getElementById('payloadIn').value = JSON.stringify(payload, null, 2);
      } else {
        document.getElementById('payloadRawIn').value = b64UrlEncode(JSON.stringify(payload));
      }
    }

    // refresh times
    function applyRefresh() {
      let payload;
      try {
        payload = JSON.parse(document.getElementById('payloadIn').value);
      } catch {
        return alert('Payload JSON inválido');
      }
      const now = Math.floor(Date.now() / 1000);
      const lt = parseInt(document.getElementById('lifetimeIn').value) || 3600;
      payload.iat = now; payload.nbf = now; payload.exp = now + lt;
      document.getElementById('payloadIn').value = JSON.stringify(payload, null, 2);
    }

    // encode & sign
    function encodeToken() {
      let headerB64, payloadB64;
      if (encodeMode === 'raw') {
        headerB64 = document.getElementById('headerRawIn').value.trim();
        payloadB64 = document.getElementById('payloadRawIn').value.trim();
      } else {
        try {
          headerB64 = b64UrlEncode(JSON.stringify(JSON.parse(document.getElementById('headerIn').value)));
          payloadB64 = b64UrlEncode(JSON.stringify(JSON.parse(document.getElementById('payloadIn').value)));
        } catch {
          return alert('Header ou Payload JSON inválido');
        }
      }
      const unsigned = headerB64 + '.' + payloadB64;
      let alg = 'none';
      try {
        const hdr = encodeMode === 'json' ? JSON.parse(document.getElementById('headerIn').value) : JSON.parse(b64UrlDecode(headerB64));
        alg = hdr.alg || 'none';
      } catch {}
      let sig = '';
      if (alg === 'HS256') {
        const secret = document.getElementById('secretIn').value;
        if (!secret) return alert('Informe o segredo para HS256');
        sig = CryptoJS.HmacSHA256(unsigned, secret).toString(CryptoJS.enc.Base64)
          .replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
      } else if (alg === 'RS256') {
        const pk = document.getElementById('privateKeyIn').value.trim();
        if (pk) {
          // assina com chave privada
          sig = KJUR.jws.JWS.sign(
            'RS256',
            JSON.stringify({ alg: 'RS256', typ: 'JWT' }),
            JSON.stringify(JSON.parse(b64UrlDecode(payloadB64))),
            pk
          ).split('.')[2];
        } else {
          // sem chave, deixa assinatura vazia
          sig = '';
        }
      } else if (alg !== 'none') {
        return alert(`Algoritmo '${alg}' não suportado`);
      }
      document.getElementById('tokenOut').value = unsigned + '.' + sig;
    }
  </script>
</body>
</html>