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<!DOCTYPE html>
<html lang="en" data-theme="dark">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>SAML Decoder: Inspect Responses, Requests, Metadata | Secutils.dev</title>
<meta name="description" content="Free SAML decoder. Inspect Base64-encoded SAML responses, AuthnRequests, and metadata. Pretty-printed XML or attribute table. Browser-only, no signup.">
<meta name="robots" content="index, follow, max-image-preview:large">
<link rel="canonical" href="https://{{TOOLS_HOST}}/saml">
<meta name="su-tool-path" content="/saml">
<meta name="su-tool-name" content="SAML Decoder">
<meta name="su-tool-description" content="Decode Base64 SAML responses, requests, and metadata. Pretty-printed XML or attribute table. Shareable URL state, no signup.">
<meta name="su-tool-promote" content="true">
<meta property="og:type" content="website">
<meta property="og:site_name" content="Secutils.dev">
<meta property="og:title" content="SAML Decoder: Inspect Responses, Requests, Metadata">
<meta property="og:description" content="Free SAML decoder. Inspect Base64-encoded SAML responses, AuthnRequests, and metadata in your browser. Pretty-printed XML or attribute table.">
<meta property="og:url" content="https://{{TOOLS_HOST}}/saml">
<meta property="og:image" content="https://secutils.dev/docs/img/og/og-saml.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="SAML Decoder on Secutils.dev: inspect SAML responses, requests, and metadata.">
<meta property="og:locale" content="en_US">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="SAML Decoder: Inspect Responses, Requests, Metadata">
<meta name="twitter:description" content="Free SAML decoder. Inspect Base64-encoded SAML responses, AuthnRequests, and metadata in your browser. No signup.">
<meta name="twitter:image" content="https://secutils.dev/docs/img/og/og-saml.png">
<script type="application/ld+json">{"@context":"https://schema.org","@type":"WebApplication","name":"SAML Decoder","url":"https://{{TOOLS_HOST}}/saml","applicationCategory":"SecurityApplication","operatingSystem":"Any","browserRequirements":"Requires JavaScript","isAccessibleForFree":true,"offers":{"@type":"Offer","price":"0","priceCurrency":"USD"},"publisher":{"@type":"Organization","name":"Secutils.dev","url":"https://secutils.dev"},"sameAs":"https://github.com/secutils-dev/secutils/blob/main/dev/tools/saml-decoder.html","description":"Free SAML decoder. Inspect Base64-encoded SAML responses, requests, and metadata in your browser. Supports HTTP-POST and HTTP-Redirect bindings. Browser-only, no signup."}</script>
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<noscript>
<p class="su-noscript"><strong>SAML Decoder</strong> — Decode Base64-encoded SAML responses, requests, and metadata. View formatted XML or browse attributes. Requires JavaScript; please enable it. Source on <a href="https://github.com/secutils-dev/secutils/blob/main/dev/tools/saml-decoder.html">GitHub</a>.</p>
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<span class="logo-badge">SAML Decoder</span>
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<span class="panel-label">Encoded SAML (Base64)</span>
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<button class="link-btn" id="exampleResponseBtn">Example response</button>
<button class="link-btn" id="exampleRequestBtn">Example request</button>
<button class="link-btn" id="clearBtn">Clear</button>
<button id="share-button" class="btn btn-primary btn-sm" title="Copy a shareable link with your encoded SAML in the URL">Share</button>
</div>
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<textarea id="encoded-saml" spellcheck="false" placeholder="Paste your SAML Response or Request here (HTTP-POST or HTTP-Redirect binding, URL-encoded or not)..." class="editor-area"></textarea>
</div>
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<div id="decoded-tabs" class="view-tabs" role="tablist" aria-label="Decoded view">
<button class="view-tab active" data-tab="xml" role="tab" aria-selected="true">XML</button>
<button class="view-tab" data-tab="attributes" role="tab" aria-selected="false">Attributes</button>
</div>
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<button id="copy-button" class="btn btn-sm" title="Copy decoded output to your clipboard">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="4" y="4" width="9" height="10" rx="1.5"/><path d="M3 11V3.5A1.5 1.5 0 0 1 4.5 2H10"/></svg>
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<div id="xml-tab" class="tab-content active" style="flex:1;min-height:0">
<div class="xml-view" style="height:100%">
<pre style="height:100%;overflow:auto"><code id="decoded-xml-container" class="language-xml"></code></pre>
</div>
</div>
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<div class="attr-view" style="height:100%;overflow:auto">
<table style="width:100%;border-collapse:collapse">
<tbody id="attributes-table-body"></tbody>
</table>
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<p>Decode Base64-encoded SAML responses, requests, and metadata.</p>
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<script>
(() => {
const skillLinkEl = document.getElementById('skillLink');
if (skillLinkEl) {
const p = location.pathname;
skillLinkEl.href = (p === '/' || p === '') ? '/llms.txt' : p.replace(/\/$/, '') + '.md';
}
const toggle = document.getElementById('themeToggle');
const root = document.documentElement;
const setTheme = (t) => {
root.setAttribute('data-theme', t);
try { localStorage.setItem('su-tool-theme', t); } catch {}
};
toggle.addEventListener('click', () => {
setTheme(root.getAttribute('data-theme') === 'dark' ? 'light' : 'dark');
});
try {
const saved = localStorage.getItem('su-tool-theme');
if (saved) setTheme(saved);
else if (window.matchMedia('(prefers-color-scheme: light)').matches) setTheme('light');
} catch {}
})();
(() => {
const dlg = document.getElementById('privacyDialog');
document.getElementById('privacyOpen').addEventListener('click', () => dlg.showModal());
document.getElementById('privacyClose').addEventListener('click', () => dlg.close());
})();
(() => {
const dlg = document.getElementById('creditsDialog');
document.getElementById('creditsOpen').addEventListener('click', () => dlg.showModal());
document.getElementById('creditsClose').addEventListener('click', () => dlg.close());
})();
// Example payloads for the Example response / Example request buttons.
const EXAMPLE_SAML_RESPONSE = `<?xml version="1.0" encoding="UTF-8"?>
<samlp:Response xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" ID="_response_42" Version="2.0" IssueInstant="2024-01-15T10:30:05Z" Destination="https://sp.example.com/acs" InResponseTo="_request_8e8dc5f6">
<saml:Issuer>https://idp.example.com/metadata</saml:Issuer>
<samlp:Status><samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/></samlp:Status>
<saml:Assertion ID="_assertion_1" Version="2.0" IssueInstant="2024-01-15T10:30:05Z">
<saml:Issuer>https://idp.example.com/metadata</saml:Issuer>
<saml:Subject>
<saml:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">jane.doe@example.com</saml:NameID>
<saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
<saml:SubjectConfirmationData NotOnOrAfter="2024-01-15T10:35:05Z" Recipient="https://sp.example.com/acs"/>
</saml:SubjectConfirmation>
</saml:Subject>
<saml:Conditions NotBefore="2024-01-15T10:30:05Z" NotOnOrAfter="2024-01-15T10:35:05Z">
<saml:AudienceRestriction><saml:Audience>https://sp.example.com/metadata</saml:Audience></saml:AudienceRestriction>
</saml:Conditions>
<saml:AuthnStatement AuthnInstant="2024-01-15T10:30:05Z" SessionIndex="_session_42">
<saml:AuthnContext>
<saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
</saml:AuthnContext>
</saml:AuthnStatement>
<saml:AttributeStatement>
<saml:Attribute Name="email" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic">
<saml:AttributeValue>jane.doe@example.com</saml:AttributeValue>
</saml:Attribute>
<saml:Attribute Name="firstName"><saml:AttributeValue>Jane</saml:AttributeValue></saml:Attribute>
<saml:Attribute Name="lastName"><saml:AttributeValue>Doe</saml:AttributeValue></saml:Attribute>
<saml:Attribute Name="groups">
<saml:AttributeValue>admins</saml:AttributeValue>
<saml:AttributeValue>developers</saml:AttributeValue>
</saml:Attribute>
</saml:AttributeStatement>
</saml:Assertion>
</samlp:Response>`;
const EXAMPLE_SAML_REQUEST = `<?xml version="1.0" encoding="UTF-8"?>
<samlp:AuthnRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" ID="_request_8e8dc5f6" Version="2.0" IssueInstant="2024-01-15T10:30:00Z" Destination="https://idp.example.com/sso" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" AssertionConsumerServiceURL="https://sp.example.com/acs">
<saml:Issuer>https://sp.example.com/metadata</saml:Issuer>
<samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" AllowCreate="true"/>
</samlp:AuthnRequest>`;
// URL state encoding: see dev/tools/AGENTS.md → "URL state encoding".
const utf8Enc = new TextEncoder();
const utf8Dec = new TextDecoder();
const toBase64Url = (bytes) => {
let s = '';
for (const b of bytes) s += String.fromCharCode(b);
return btoa(s).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
};
const fromBase64Url = (str) => {
const b64 = str.replace(/-/g, '+').replace(/_/g, '/');
const padded = b64 + '==='.slice(0, (4 - b64.length % 4) % 4);
const bin = atob(padded);
const out = new Uint8Array(bin.length);
for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
return out;
};
const encodeState = async (text) => {
const bytes = utf8Enc.encode(text);
const stream = new Blob([bytes]).stream().pipeThrough(new CompressionStream('deflate-raw'));
const deflated = new Uint8Array(await new Response(stream).arrayBuffer());
const out = new Uint8Array(4 + deflated.length);
new DataView(out.buffer).setUint32(0, bytes.length, true);
out.set(deflated, 4);
return toBase64Url(out);
};
const decodeState = async (str) => {
try {
const bytes = fromBase64Url(str);
if (bytes.length < 4) return null;
const stream = new Blob([bytes.subarray(4)]).stream()
.pipeThrough(new DecompressionStream('deflate-raw'));
const inflated = new Uint8Array(await new Response(stream).arrayBuffer());
return utf8Dec.decode(inflated);
} catch { return null; }
};
const toastEl = document.getElementById('toast');
const toastMsgEl = document.getElementById('toastMsg');
let toastTimer;
function toast(msg) {
toastMsgEl.textContent = msg;
toastEl.style.display = 'flex';
clearTimeout(toastTimer);
toastTimer = setTimeout(() => { toastEl.style.display = 'none'; }, 2000);
}
document.addEventListener('DOMContentLoaded', async () => {
const encodedSamlInput = document.getElementById('encoded-saml');
const xmlContainer = document.getElementById('decoded-xml-container');
const copyButton = document.getElementById('copy-button');
const shareButton = document.getElementById('share-button');
const tabsContainer = document.getElementById('decoded-tabs');
const attributesTableBody = document.getElementById('attributes-table-body');
const tabContents = document.getElementById('decoded-tab-content');
const fullscreenBtn = document.getElementById('fullscreen-btn');
const fullscreenEnterIcon = document.getElementById('fullscreen-enter-icon');
const fullscreenExitIcon = document.getElementById('fullscreen-exit-icon');
const decodedPane = document.getElementById('decoded-pane');
const exampleResponseBtn = document.getElementById('exampleResponseBtn');
const exampleRequestBtn = document.getElementById('exampleRequestBtn');
const clearBtn = document.getElementById('clearBtn');
let rawDecodedXml = '';
const prettyPrintXml = (xml) => {
const PADDING = ' ';
let indent = 0;
let formatted = '';
const normalized = xml.replace(/>\s*</g, '><').trim().replace(/(>)(<)(\/*)/g, '$1\r\n$2$3');
for (const line of normalized.split('\r\n')) {
const trimmed = line.trim();
if (!trimmed) continue;
const isClosingTag = trimmed.startsWith('</');
if (isClosingTag && indent > 0) indent--;
formatted += PADDING.repeat(indent) + trimmed + '\n';
if (trimmed.startsWith('<') && !isClosingTag && !trimmed.endsWith('/>') && !trimmed.includes('</')) {
indent++;
}
}
return formatted.trim();
};
const buildStaticXmlView = (xmlString) => hljs.highlight(xmlString, { language: 'xml' }).value;
const escapeHtml = (str) => String(str)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/"/g, '"')
.replace(/'/g, ''');
const appendAttrRow = (name, value) => {
if (value == null || value === '') return;
const row = attributesTableBody.insertRow();
row.insertCell().textContent = name;
row.insertCell().innerHTML = value;
};
const renderRequestInfo = (rootElement) => {
const fields = ['ID', 'Destination', 'AssertionConsumerServiceURL', 'ProtocolBinding', 'IssueInstant'];
for (const field of fields) {
const attr = rootElement.getAttribute(field);
if (attr) appendAttrRow(field, escapeHtml(attr));
}
const [issuerNode] = rootElement.getElementsByTagNameNS('*', 'Issuer');
const issuer = issuerNode?.textContent.trim();
if (issuer) appendAttrRow('Issuer', escapeHtml(issuer));
if (!attributesTableBody.hasChildNodes()) {
attributesTableBody.innerHTML = '<tr><td colspan="2" class="empty-msg">No request fields found.</td></tr>';
}
};
const renderResponseAttributes = (xmlDoc) => {
const attributeNodes = xmlDoc.getElementsByTagNameNS('*', 'Attribute');
if (attributeNodes.length === 0) {
attributesTableBody.innerHTML = '<tr><td colspan="2" class="empty-msg">No attributes found.</td></tr>';
return;
}
for (const node of attributeNodes) {
const name = node.getAttribute('Name') || node.getAttribute('FriendlyName') || 'N/A';
const valueNodes = node.getElementsByTagNameNS('*', 'AttributeValue');
const valueHtml = [...valueNodes].map((vn) => escapeHtml(vn.textContent.trim())).join('<br>');
appendAttrRow(name, valueHtml);
}
};
const parseAndDisplayAttributes = (xmlString) => {
attributesTableBody.innerHTML = '';
if (!xmlString) return;
try {
const xmlDoc = new DOMParser().parseFromString(xmlString, 'text/xml');
if (xmlDoc.querySelector('parsererror')) return;
const root = xmlDoc.documentElement;
const localName = root?.localName ?? '';
if (/Request$/.test(localName)) {
renderRequestInfo(root);
} else {
renderResponseAttributes(xmlDoc);
}
} catch {
attributesTableBody.innerHTML = '<tr><td colspan="2" class="empty-msg" style="color:var(--error)">Error parsing attributes.</td></tr>';
}
};
const base64ToBytes = (str) => Uint8Array.from(atob(str), (c) => c.charCodeAt(0));
const bytesToXml = (bytes) => {
try {
const text = new TextDecoder('utf-8', { fatal: false }).decode(bytes);
if (text.trim().startsWith('<')) return text;
} catch {}
return null;
};
const decodeSaml = () => {
let samlValue = encodedSamlInput.value.trim();
encodedSamlInput.classList.remove('invalid');
if (!samlValue) {
xmlContainer.innerHTML = '';
rawDecodedXml = '';
parseAndDisplayAttributes('');
return;
}
try {
try { samlValue = decodeURIComponent(samlValue); } catch {}
samlValue = samlValue.replace(/\s+/g, '');
const bytes = base64ToBytes(samlValue);
let decodedString = bytesToXml(bytes);
if (!decodedString) {
try {
decodedString = bytesToXml(pako.inflateRaw(bytes));
} catch {}
}
if (!decodedString) throw new Error('Decoded content is not valid XML.');
const prettyXml = prettyPrintXml(decodedString);
rawDecodedXml = prettyXml;
xmlContainer.innerHTML = buildStaticXmlView(prettyXml);
parseAndDisplayAttributes(prettyXml);
} catch (error) {
const errorMessage = `Error: ${error.message}\n\nPlease check if the input is a valid Base64-encoded SAML document (optionally DEFLATE-compressed and/or URL-encoded).`;
xmlContainer.textContent = errorMessage;
rawDecodedXml = errorMessage;
encodedSamlInput.classList.add('invalid');
parseAndDisplayAttributes('');
}
};
encodedSamlInput.addEventListener('input', decodeSaml);
exampleResponseBtn.addEventListener('click', () => {
encodedSamlInput.value = btoa(EXAMPLE_SAML_RESPONSE);
decodeSaml();
});
exampleRequestBtn.addEventListener('click', () => {
encodedSamlInput.value = btoa(EXAMPLE_SAML_REQUEST);
decodeSaml();
});
clearBtn.addEventListener('click', () => {
encodedSamlInput.value = '';
history.replaceState({}, '', location.pathname + location.search);
decodeSaml();
});
copyButton.addEventListener('click', async () => {
const activeTab = tabsContainer.querySelector('.active').dataset.tab;
let contentToCopy = '';
if (activeTab === 'xml') {
contentToCopy = rawDecodedXml;
} else {
for (const row of attributesTableBody.querySelectorAll('tr')) {
const cells = row.querySelectorAll('td');
if (cells.length === 2) {
const values = cells[1].innerHTML.replace(/<br>/g, ', ');
contentToCopy += `${cells[0].textContent}: ${values}\n`;
}
}
}
if (!contentToCopy) return;
try {
await navigator.clipboard.writeText(contentToCopy.trim());
toast('Copied to clipboard');
} catch {
toast('Failed to copy');
}
});
shareButton.addEventListener('click', async () => {
const samlValue = encodedSamlInput.value.trim();
if (!samlValue) return;
const encoded = await encodeState(samlValue);
const shareUrl = `${window.location.origin}${window.location.pathname}#${encoded}`;
try {
await navigator.clipboard.writeText(shareUrl);
toast('Share link copied');
} catch {
toast('Failed to copy share link');
}
});
tabsContainer.addEventListener('click', (e) => {
if (!e.target.classList.contains('view-tab')) return;
for (const btn of tabsContainer.querySelectorAll('.view-tab')) {
btn.classList.remove('active');
btn.setAttribute('aria-selected', 'false');
}
e.target.classList.add('active');
e.target.setAttribute('aria-selected', 'true');
for (const content of tabContents.querySelectorAll('.tab-content')) content.classList.remove('active');
document.getElementById(`${e.target.dataset.tab}-tab`).classList.add('active');
});
fullscreenBtn.addEventListener('click', async () => {
if (!document.fullscreenElement) {
try {
await decodedPane.requestFullscreen();
} catch (err) {
alert(`Error attempting to enable full-screen mode: ${err.message} (${err.name})`);
}
} else {
document.exitFullscreen();
}
});
document.addEventListener('fullscreenchange', () => {
const entering = !!document.fullscreenElement;
fullscreenEnterIcon.style.display = entering ? 'none' : 'block';
fullscreenExitIcon.style.display = entering ? 'block' : 'none';
});
(() => {
const splitter = document.getElementById('splitter');
const grid = splitter.parentElement;
let dragging = false;
splitter.addEventListener('mousedown', (e) => {
e.preventDefault();
dragging = true;
splitter.classList.add('active');
document.body.style.cursor = 'col-resize';
document.body.style.userSelect = 'none';
});
document.addEventListener('mousemove', (e) => {
if (!dragging) return;
const rect = grid.getBoundingClientRect();
const pct = Math.max(15, Math.min(85, ((e.clientX - rect.left) / rect.width) * 100));
grid.style.gridTemplateColumns = `${pct}% 12px ${100 - pct}%`;
});
document.addEventListener('mouseup', () => {
if (!dragging) return;
dragging = false;
splitter.classList.remove('active');
document.body.style.cursor = '';
document.body.style.userSelect = '';
});
})();
if (location.hash.length > 1) {
const initial = await decodeState(location.hash.slice(1));
if (initial) encodedSamlInput.value = initial;
}
decodeSaml();
});
</script>
</body>
</html>