{"id":9315,"date":"2026-08-09T15:37:24","date_gmt":"2026-08-09T13:37:24","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/blog\/werkzeuge\/ga4-pii-checker\/"},"modified":"2026-08-09T15:37:24","modified_gmt":"2026-08-09T13:37:24","slug":"ga4-pii-checker","status":"publish","type":"page","link":"https:\/\/www.lukaswojcik.com\/blog\/de\/werkzeuge\/ga4-pii-checker\/","title":{"rendered":"GA4 PII Checker"},"content":{"rendered":"<p><script src=\"https:\/\/accounts.google.com\/gsi\/client\" async defer><\/script><\/p>\n<div class=\"ga4-pii-container\" style=\"background: var(--bg-panel, #1e1e24); padding: 25px; border-radius: 8px; border: 1px solid var(--border, #2a2a35);\">\n<p style=\"color: var(--text-secondary); margin-bottom: 20px; line-height: 1.6;\">\n        Verbinden Sie sich per OAuth 2.0 direkt mit der <strong>Google Analytics Data API v1<\/strong>.<br \/>\n        Durchsuchen Sie die Seitenberichte Ihrer Property nach personenbezogenen Daten (PII) wie E-Mail-Adressen, Telefonnummern oder eindeutigen Nutzerkennungen in den Abfrageparametern der URL. Alle Pr\u00fcfungen laufen lokal in Ihrem Browser.\n    <\/p>\n<p>    <!-- STEP 1: OAUTH & AUTHENTICATION --><\/p>\n<div style=\"background: var(--bg-body, #101416); padding: 20px; border-radius: 8px; border: 1px solid var(--border); margin-bottom: 20px;\">\n<h3 style=\"color: var(--accent); font-size: 1rem; margin-top: 0; margin-bottom: 12px;\">1. Authentifizierung an der Google Analytics API<\/h3>\n<div style=\"display: flex; gap: 15px; flex-wrap: wrap; align-items: flex-end;\">\n<div style=\"flex: 1; min-width: 280px;\">\n                <label style=\"color: var(--text-secondary); display: block; font-size: 0.85rem; margin-bottom: 6px;\">Google Cloud OAuth Client ID:<\/label><br \/>\n                <input type=\"text\" id=\"ga4-client-id\" value=\"423029313598-2ko0jilc28eevp253rqncvodg2181e1l.apps.googleusercontent.com\" class=\"form-control\" style=\"width: 100%; padding: 10px; background: var(--bg-panel); border: 1px solid var(--border); color: var(--text-primary); border-radius: 6px; font-family: monospace;\">\n            <\/div>\n<div>\n                <button id=\"ga4-auth-btn\" class=\"button\" style=\"background: var(--accent); color: #0b1114; border: none; padding: 11px 22px; border-radius: 6px; font-weight: 700; cursor: pointer;\">Mit Google autorisieren<\/button>\n            <\/div>\n<\/p><\/div>\n<div id=\"ga4-auth-status\" style=\"margin-top: 10px; font-size: 0.85rem; color: var(--text-secondary);\">Status: <strong style=\"color: #ff6b6b;\">Nicht verbunden<\/strong><\/div>\n<\/p><\/div>\n<p>    <!-- STEP 2: PROPERTY & SCAN CONFIGURATION --><\/p>\n<div id=\"ga4-config-panel\" style=\"background: var(--bg-body); padding: 20px; border-radius: 8px; border: 1px solid var(--border); margin-bottom: 20px; display: none;\">\n<h3 style=\"color: var(--accent); font-size: 1rem; margin-top: 0; margin-bottom: 12px;\">2. Property und Pr\u00fcfumfang festlegen<\/h3>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; margin-bottom: 15px;\">\n<div>\n                <label style=\"color: var(--text-secondary); display: block; font-size: 0.85rem; margin-bottom: 6px;\">GCP Project ID (optionale Angabe):<\/label><br \/>\n                <input type=\"text\" id=\"gcp-project-id\" value=\"lukaswojcik\" placeholder=\"z. B. my-gcp-project-123\" style=\"width: 100%; padding: 10px; background: var(--bg-panel); color: var(--text-primary); border: 1px solid var(--border); border-radius: 6px; font-family: monospace;\">\n            <\/div>\n<div>\n                <label style=\"color: var(--text-secondary); display: block; font-size: 0.85rem; margin-bottom: 6px;\">GA4 Property ID (numerisch):<\/label><br \/>\n                <input type=\"text\" id=\"ga4-property-id\" placeholder=\"z. B. 345678901\" style=\"width: 100%; padding: 10px; background: var(--bg-panel); color: var(--text-primary); border: 1px solid var(--border); border-radius: 6px; font-family: monospace;\">\n            <\/div>\n<div>\n                <label style=\"color: var(--text-secondary); display: block; font-size: 0.85rem; margin-bottom: 6px;\">Zeitraum:<\/label><br \/>\n                <select id=\"ga4-date-range\" style=\"width: 100%; padding: 10px; background: var(--bg-panel); color: var(--text-primary); border: 1px solid var(--border); border-radius: 6px;\"><option value=\"7daysAgo\">Letzte 7 Tage<\/option><option value=\"30daysAgo\" selected>Letzte 30 Tage (Standard)<\/option><option value=\"90daysAgo\">Letzte 90 Tage<\/option><\/select>\n            <\/div>\n<\/p><\/div>\n<div style=\"display: flex; justify-content: flex-end;\">\n            <button id=\"run-pii-scan-btn\" class=\"button\" style=\"background: var(--accent); color: #0b1114; border: none; padding: 11px 26px; border-radius: 6px; font-weight: 700; cursor: pointer;\">Seitenberichte auf PII pr\u00fcfen<\/button>\n        <\/div>\n<\/p><\/div>\n<p>    <!-- SCAN STATUS \/ PROGRESS --><\/p>\n<div id=\"scan-summary-bar\" style=\"margin-bottom: 20px;\"><\/div>\n<p>    <!-- PII VIOLATIONS RESULTS --><\/p>\n<div id=\"pii-results-container\"><\/div>\n<\/div>\n<p><script>\n(() => {\n    let accessToken = null;\n    let tokenClient = null;<\/p>\n<p>    const authBtn = document.getElementById(\"ga4-auth-btn\");\n    const authStatus = document.getElementById(\"ga4-auth-status\");\n    const configPanel = document.getElementById(\"ga4-config-panel\");\n    const runScanBtn = document.getElementById(\"run-pii-scan-btn\");\n    const summaryBar = document.getElementById(\"scan-summary-bar\");\n    const resultsContainer = document.getElementById(\"pii-results-container\");<\/p>\n<p>    const esc = (str) => String(str).replace(\/&\/g, \"&amp;\").replace(\/<\/g, \"&lt;\").replace(\/>\/g, \"&gt;\");<\/p>\n<p>    \/\/ 1. OAUTH 2.0 INITIALIZATION\n    authBtn.addEventListener(\"click\", () => {\n        const clientId = document.getElementById(\"ga4-client-id\").value.trim();\n        if (!clientId) {\n            alert(\"Bitte geben Sie eine g\u00fcltige Google Cloud Client ID ein.\");\n            return;\n        }<\/p>\n<p>        if (!window.google || !google.accounts || !google.accounts.oauth2) {\n            alert(\"Das Skript von Google Identity Services wird noch geladen. Bitte versuchen Sie es in einem Moment erneut.\");\n            return;\n        }<\/p>\n<p>        tokenClient = google.accounts.oauth2.initTokenClient({\n            client_id: clientId,\n            scope: \"https:\/\/www.googleapis.com\/auth\/analytics.readonly\",\n            callback: (resp) => {\n                if (resp.error) {\n                    authStatus.innerHTML = \"Status: <strong style='color:#ff6b6b;'>Authentifizierungsfehler: \" + esc(resp.error) + \"<\/strong>\";\n                    return;\n                }\n                accessToken = resp.access_token;\n                authStatus.innerHTML = \"Status: <strong style='color:#51cf66;'>Verbunden (Analytics, nur Lesezugriff)<\/strong>\";\n                configPanel.style.display = \"block\";\n            }\n        });\n        tokenClient.requestAccessToken();\n    });<\/p>\n<p>    \/\/ 2. PII DETECTION ENGINE\n    const scanUrlForPII = (urlStr) => {\n        const findings = [];\n        let urlObj;\n        try {\n            urlObj = new URL(urlStr.startsWith(\"http\") ? urlStr : \"https:\/\/\" + urlStr);\n        } catch (e) {\n            return findings;\n        }<\/p>\n<p>        const params = urlObj.searchParams;\n        const emailRegex = \/([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,})\/i;\n        const phoneRegex = \/(?:+|00)?d{9,15}\/;\n        const uuidRegex = \/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$\/i;\n        const idKeys = [\"user_id\", \"userid\", \"uid\", \"customer_id\", \"client_id\", \"pesel\", \"nip\", \"token\", \"session_id\", \"email\", \"mail\", \"phone\", \"tel\"];<\/p>\n<p>        params.forEach((value, key) => {\n            const lowKey = key.toLowerCase();\n            const cleanVal = decodeURIComponent(value).trim();<\/p>\n<p>            \/\/ Test Email\n            if (emailRegex.test(cleanVal) || (lowKey.includes(\"email\") && cleanVal.includes(\"@\"))) {\n                findings.push({ type: \"EMAIL\", paramKey: key, paramValue: cleanVal });\n                return;\n            }<\/p>\n<p>            \/\/ Test Phone\n            if ((lowKey.includes(\"phone\") || lowKey.includes(\"tel\") || lowKey.includes(\"kom\")) && phoneRegex.test(cleanVal.replace(\/[s.-]\/g, \"\"))) {\n                findings.push({ type: \"PHONE\", paramKey: key, paramValue: cleanVal });\n                return;\n            }<\/p>\n<p>            \/\/ Test Unique Identifier\n            if (idKeys.some(k => lowKey === k) || uuidRegex.test(cleanVal)) {\n                if (cleanVal.length > 3 && cleanVal !== \"null\" && cleanVal !== \"undefined\" && cleanVal !== \"true\" && cleanVal !== \"false\") {\n                    findings.push({ type: \"UNIQUE IDENTIFIER\", paramKey: key, paramValue: cleanVal });\n                }\n            }\n        });<\/p>\n<p>        return findings;\n    };<\/p>\n<p>    \/\/ Schl\u00fcssel bleiben englisch (sie steuern die Farbzuordnung), nur die Anzeige ist \u00fcbersetzt.\n    const TYPE_LABELS = {\n        \"EMAIL\": \"E-MAIL\",\n        \"PHONE\": \"TELEFON\",\n        \"UNIQUE IDENTIFIER\": \"EINDEUTIGE KENNUNG\"\n    };<\/p>\n<p>    const getBadge = (type) => {\n        const colors = {\n            \"EMAIL\": { bg: \"#471a1a\", color: \"#ff6b6b\" },\n            \"PHONE\": { bg: \"#4b3a1a\", color: \"#ff922b\" },\n            \"UNIQUE IDENTIFIER\": { bg: \"#2a1a4b\", color: \"#cc5de8\" }\n        };\n        const c = colors[type] || { bg: \"#242b30\", color: \"#ffffff\" };\n        const label = TYPE_LABELS[type] || type;\n        return \"<span style='background:\" + c.bg + \"; color:\" + c.color + \"; padding:4px 10px; border-radius:4px; font-size:0.75rem; font-weight:700; text-transform:uppercase;'>\" + label + \"<\/span>\";\n    };<\/p>\n<p>    \/\/ 3. GA4 DATA API RUN REPORT\n    runScanBtn.addEventListener(\"click\", async () => {\n        const propertyId = document.getElementById(\"ga4-property-id\").value.trim().replace(\/^properties\/\/i, \"\");\n        const dateRange = document.getElementById(\"ga4-date-range\").value;<\/p>\n<p>        if (!propertyId || isNaN(propertyId)) {\n            alert(\"Bitte geben Sie eine g\u00fcltige numerische GA4 Property ID ein (z. B. 345678901).\");\n            return;\n        }<\/p>\n<p>        runScanBtn.disabled = true;\n        runScanBtn.textContent = \"GA4-URLs werden gepr\u00fcft ...\";\n        summaryBar.innerHTML = \"\";\n        resultsContainer.innerHTML = \"\";<\/p>\n<p>        try {\n            const response = await fetch(\"https:\/\/analyticsdata.googleapis.com\/v1beta\/properties\/\" + propertyId + \":runReport\", {\n                method: \"POST\",\n                headers: {\n                    \"Authorization\": \"Bearer \" + accessToken,\n                    \"Content-Type\": \"application\/json\"\n                },\n                body: JSON.stringify({\n                    dateRanges: [{ startDate: dateRange, endDate: \"today\" }],\n                    dimensions: [{ name: \"pageLocation\" }],\n                    metrics: [{ name: \"screenPageViews\" }],\n                    limit: 10000\n                })\n            });<\/p>\n<p>            if (!response.ok) {\n                const errJson = await response.json().catch(() => ({}));\n                const errMsg = errJson.error ? errJson.error.message : response.statusText;\n                throw new Error(errMsg);\n            }<\/p>\n<p>            const data = await response.json();\n            const rows = data.rows || [];\n            const totalUrlsChecked = rows.length;<\/p>\n<p>            const violations = [];<\/p>\n<p>            rows.forEach(row => {\n                const url = row.dimensionValues[0].value;\n                const pageviews = Number(row.metricValues[0].value || 0);\n                const detectedPII = scanUrlForPII(url);<\/p>\n<p>                if (detectedPII.length > 0) {\n                    violations.push({\n                        url: url,\n                        pageviews: pageviews,\n                        findings: detectedPII\n                    });\n                }\n            });<\/p>\n<p>            \/\/ 4. RENDER SUMMARY & VIOLATIONS\n            summaryBar.innerHTML = [\n                \"<\/p>\n<div style='background:var(--bg-body); padding:16px 20px; border-radius:8px; border:1px solid var(--border); display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:15px;'>\",\n                \"  <\/p>\n<div>\",\n                \"    <span style='color:var(--text-secondary); font-size:0.85rem; display:block;'>Gepr\u00fcfte GA4-URLs insgesamt<\/span>\",\n                \"    <strong style='color:var(--accent); font-size:1.4rem;'>\" + totalUrlsChecked.toLocaleString() + \" Seiten<\/strong>\",\n                \"  <\/div>\n<p>\",\n                \"  <\/p>\n<div>\",\n                \"    <span style='color:var(--text-secondary); font-size:0.85rem; display:block;'>Erkannte PII-Verst\u00f6\u00dfe<\/span>\",\n                \"    <strong style='color:\" + (violations.length > 0 ? \"#ff6b6b\" : \"#51cf66\") + \"; font-size:1.4rem;'>\" + violations.length.toLocaleString() + \" URLs<\/strong>\",\n                \"  <\/div>\n<p>\",\n                \"  <\/p>\n<div>\",\n                \"    <span style='color:var(--text-secondary); font-size:0.85rem; display:block;'>Zeitraum<\/span>\",\n                \"    <strong style='color:var(--text-primary); font-size:1rem;'>\" + dateRange + \" &rarr; today<\/strong>\",\n                \"  <\/div>\n<p>\",\n                \"<\/p><\/div>\n<p>\"\n            ].join(\"\");<\/p>\n<p>            if (violations.length === 0) {\n                resultsContainer.innerHTML = \"<\/p>\n<div style='background:var(--bg-body); padding:30px; border-radius:8px; border:1px solid var(--border); text-align:center; color:#51cf66; font-weight:bold; font-size:1.1rem;'>\u2714 Saubere Property: In allen \" + totalUrlsChecked + \" URLs wurde kein einziger PII-Versto\u00df gefunden!<\/div>\n<p>\";\n                return;\n            }<\/p>\n<p>            \/\/ Sort violations by highest screenPageViews\n            violations.sort((a, b) => b.pageviews - a.pageviews);<\/p>\n<p>            const cardsHtml = violations.map(v => {\n                const findingsHtml = v.findings.map(f => [\n                    \"<\/p>\n<div style='background:#0b1114; border:1px solid var(--border); padding:10px 14px; border-radius:6px; margin-top:8px; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:10px; font-family:monospace; font-size:0.85rem;'>\",\n                    \"  <\/p>\n<div>\",\n                    \"    <span style='color:var(--text-secondary);'>Parametername: <\/span><strong style='color:#ff922b;'>\" + esc(f.paramKey) + \"<\/strong>\",\n                    \"  <\/div>\n<p>\",\n                    \"  <\/p>\n<div>\",\n                    \"    <span style='color:var(--text-secondary);'>Erkannter Wert: <\/span><code style='color:#ff6b6b; background:rgba(255,107,107,0.1); padding:2px 6px; border-radius:4px;'>\" + esc(f.paramValue) + \"<\/code>\",\n                    \"  <\/div>\n<p>\",\n                    \"  <\/p>\n<div>\" + getBadge(f.type) + \"<\/div>\n<p>\",\n                    \"<\/p><\/div>\n<p>\"\n                ].join(\"\")).join(\"\");<\/p>\n<p>                return [\n                    \"<\/p>\n<div style='background:var(--bg-body); border:1px solid var(--border); border-radius:8px; padding:18px; margin-bottom:15px;'>\",\n                    \"  <\/p>\n<div style='display:flex; justify-content:space-between; align-items:flex-start; flex-wrap:wrap; gap:10px; border-bottom:1px solid var(--border); padding-bottom:12px; margin-bottom:12px;'>\",\n                    \"    <\/p>\n<div style='word-break:break-all; flex:1; min-width:280px;'>\",\n                    \"      <strong style='color:var(--text-primary); font-family:monospace; font-size:0.9rem; line-height:1.4;'>\" + esc(v.url) + \"<\/strong>\",\n                    \"    <\/div>\n<p>\",\n                    \"    <\/p>\n<div style='white-space:nowrap; background:rgba(43,166,223,0.1); border:1px solid rgba(43,166,223,0.3); padding:4px 12px; border-radius:20px; font-size:0.8rem; color:var(--accent); font-weight:700;'>\",\n                    \"      \" + v.pageviews.toLocaleString() + \" Seitenaufrufe\",\n                    \"    <\/div>\n<p>\",\n                    \"  <\/p><\/div>\n<p>\",\n                    \"  <\/p>\n<div style='color:var(--text-secondary); font-size:0.85rem; font-weight:600;'>Erkannte PII-Parameter:<\/div>\n<p>\",\n                    \"  \" + findingsHtml,\n                    \"<\/p><\/div>\n<p>\"\n                ].join(\"\");\n            }).join(\"\");<\/p>\n<p>            resultsContainer.innerHTML = [\n                \"<\/p>\n<h3 style='color:var(--text-primary); margin-bottom:15px; font-size:1.15rem;'>Aufschl\u00fcsselung der PII-Verst\u00f6\u00dfe (\" + violations.length + \")<\/h3>\n<p>\",\n                cardsHtml\n            ].join(\"\");<\/p>\n<p>        } catch (e) {\n            resultsContainer.innerHTML = \"<\/p>\n<div style='background:var(--bg-body); padding:25px; border-radius:8px; border:1px solid #ff6b6b; color:#ff6b6b; font-weight:bold;'>API-Fehler: \" + esc(e.message) + \"<\/div>\n<p>\";\n        } finally {\n            runScanBtn.disabled = false;\n            runScanBtn.textContent = \"Seitenberichte auf PII pr\u00fcfen\";\n        }\n    });\n})();\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Verbindet sich per OAuth 2.0 mit der Google Analytics Data API v1 und durchsucht die Seitenberichte einer GA4-Property nach personenbezogenen Daten in URL-Parametern.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":9283,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-tool-base.php","meta":{"footnotes":""},"class_list":["post-9315","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>GA4 PII Checker - Lukas Wojcik - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lukaswojcik.com\/blog\/de\/werkzeuge\/ga4-pii-checker\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GA4 PII Checker - Lukas Wojcik - Blog\" \/>\n<meta property=\"og:description\" content=\"Verbindet sich per OAuth 2.0 mit der Google Analytics Data API v1 und durchsucht die Seitenberichte einer GA4-Property nach personenbezogenen Daten in URL-Parametern.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.lukaswojcik.com\/blog\/de\/werkzeuge\/ga4-pii-checker\/\" \/>\n<meta property=\"og:site_name\" content=\"Lukas Wojcik - Blog\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.lukaswojcik.com\/blog\/wp-content\/uploads\/2026\/08\/og-default.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.lukaswojcik.com\\\/blog\\\/de\\\/werkzeuge\\\/ga4-pii-checker\\\/\",\"url\":\"https:\\\/\\\/www.lukaswojcik.com\\\/blog\\\/de\\\/werkzeuge\\\/ga4-pii-checker\\\/\",\"name\":\"GA4 PII Checker - 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