{"id":8816,"date":"2026-08-05T15:36:55","date_gmt":"2026-08-05T13:36:55","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/blog\/?p=8816"},"modified":"2026-08-05T20:46:36","modified_gmt":"2026-08-05T18:46:36","slug":"ga4-bot-detector","status":"publish","type":"page","link":"https:\/\/www.lukaswojcik.com\/blog\/en\/toolbox\/ga4-bot-detector\/","title":{"rendered":"GA4 Bot Detector"},"content":{"rendered":"<p><script src=\"https:\/\/accounts.google.com\/gsi\/client\" async defer><\/script><\/p>\n<div class=\"ga4-bot-detector-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        Connect directly to the <strong>Google Analytics Data API v1<\/strong> via OAuth 2.0 to scan your traffic dimensions (OS, Browser, Country, Source\/Medium) for non-human crawler patterns, ghost spam, and zero-engagement bot segments.<br \/>\n        All heuristic evaluations execute locally in your browser &mdash; zero data is stored or transmitted to our servers.\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. Google Analytics API Authentication<\/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;\">Authorize with Google<\/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;\">Not connected<\/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 &amp; Bot Scan Configuration<\/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 Reference:<\/label><br \/>\n                <input type=\"text\" id=\"gcp-project-id\" value=\"lukaswojcik\" placeholder=\"lukaswojcik\" 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 (Numeric):<\/label><br \/>\n                <input type=\"text\" id=\"ga4-property-id\" placeholder=\"e.g., 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;\">Timeframe:<\/label><br \/>\n                <select id=\"ga4-timeframe\" style=\"width: 100%; padding: 10px; background: var(--bg-panel); color: var(--text-primary); border: 1px solid var(--border); border-radius: 6px;\"><option value=\"14daysAgo\">Last 14 Days<\/option><option value=\"30daysAgo\" selected>Last 30 Days (Recommended)<\/option><option value=\"60daysAgo\">Last 60 Days<\/option><\/select>\n            <\/div>\n<div>\n                <label style=\"color: var(--text-secondary); display: block; font-size: 0.85rem; margin-bottom: 6px;\">Min. Sessions Threshold:<\/label><br \/>\n                <select id=\"ga4-min-sessions\" style=\"width: 100%; padding: 10px; background: var(--bg-panel); color: var(--text-primary); border: 1px solid var(--border); border-radius: 6px;\"><option value=\"5\">5+ Sessions<\/option><option value=\"10\" selected>10+ Sessions (Default)<\/option><option value=\"25\">25+ Sessions (Major Cohorts Only)<\/option><\/select>\n            <\/div>\n<\/p><\/div>\n<div style=\"display: flex; justify-content: flex-end;\">\n            <button id=\"run-bot-scan-btn\" class=\"button\" style=\"background: var(--accent); color: #0b1114; border: none; padding: 11px 26px; border-radius: 6px; font-weight: 700; cursor: pointer;\">Scan Traffic for Bot Cohorts<\/button>\n        <\/div>\n<\/p><\/div>\n<p>    <!-- SCAN STATUS \/ SUMMARY BAR --><\/p>\n<div id=\"bot-summary-bar\" style=\"margin-bottom: 20px;\"><\/div>\n<p>    <!-- BOT RESULTS CONTAINER --><\/p>\n<div id=\"bot-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-bot-scan-btn\");\n    const summaryBar = document.getElementById(\"bot-summary-bar\");\n    const resultsContainer = document.getElementById(\"bot-results-container\");<\/p>\n<p>    \/\/ Safe unicode replacement to prevent WP entity encoding\n    const esc = (str) => String(str).replace(\/u0026\/g, \"&amp;\").replace(\/u003c\/g, \"&lt;\").replace(\/u003e\/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(\"Please enter a valid Google Cloud Client ID.\");\n            return;\n        }<\/p>\n<p>        let gsiReady = false;\n        if (window.google) {\n            if (google.accounts) {\n                if (google.accounts.oauth2) {\n                    gsiReady = true;\n                }\n            }\n        }<\/p>\n<p>        if (!gsiReady) {\n            alert(\"Google Identity Services script is still loading. Please try again in a moment.\");\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;'>Auth Error: \" + esc(resp.error) + \"<\/strong>\";\n                    return;\n                }\n                accessToken = resp.access_token;\n                authStatus.innerHTML = \"Status: <strong style='color:#51cf66;'>Connected (Analytics Read-Only)<\/strong>\";\n                configPanel.style.display = \"block\";\n            }\n        });\n        tokenClient.requestAccessToken();\n    });<\/p>\n<p>    \/\/ 2. BOT HEURISTIC ENGINE (WP Filter-Safe Logic)\n    const evaluateBotBehavior = (row) => {\n        const browser = row.dimensionValues[0].value;\n        const os = row.dimensionValues[1].value;\n        const country = row.dimensionValues[2].value;\n        const sourceMedium = row.dimensionValues[3].value;<\/p>\n<p>        const sessions = Number(row.metricValues[0].value ? row.metricValues[0].value : 0);\n        const pageviews = Number(row.metricValues[1].value ? row.metricValues[1].value : 0);\n        const engagementRate = parseFloat(row.metricValues[2].value ? row.metricValues[2].value : 0);\n        const bounceRate = parseFloat(row.metricValues[3].value ? row.metricValues[3].value : 0);\n        const avgSessionDuration = parseFloat(row.metricValues[4].value ? row.metricValues[4].value : 0);<\/p>\n<p>        const viewsPerSession = sessions > 0 ? pageviews \/ sessions : 0;<\/p>\n<p>        let botScore = 0;\n        const flags = [];<\/p>\n<p>        \/\/ Rule 1: Zero Engagement Traffic (0% - 2% engagement)\n        if (engagementRate <= 0.02) {\n            botScore += 40;\n            flags.push(\"Zero Engagement (\" + (engagementRate * 100).toFixed(1) + \"% engaged)\");\n        }\n\n        \/\/ Rule 2: Single-Page Repetitive Crawler (Exactly 1 pageview per session &#038; 95%+ bounce)\n        if (viewsPerSession <= 1.05) {\n            if (bounceRate >= 0.95) {\n                botScore += 35;\n                flags.push(\"Single-Page Crawler (\" + viewsPerSession.toFixed(2) + \" views\/session)\");\n            }\n        }<\/p>\n<p>        \/\/ Rule 3: Zero Second Session Duration\n        if (avgSessionDuration <= 1.0) {\n            botScore += 25;\n            flags.push(\"Instant Session Duration (\" + avgSessionDuration.toFixed(1) + \"s)\");\n        }\n\n        \/\/ Rule 4: Suspicious OS \/ Browser combinations\n        const lowBrowser = browser.toLowerCase();\n        const lowOs = os.toLowerCase();\n        const suspiciousTerms = [\"bot\", \"crawler\", \"spider\", \"headless\"];\n        let isSuspicious = suspiciousTerms.some(term => lowBrowser.includes(term));\n        if (lowOs.includes(\"linux\")) {\n            isSuspicious = true;\n        }\n        if (isSuspicious) {\n            botScore += 20;\n            flags.push(\"Suspicious Signature (\" + browser + \" \/ \" + os + \")\");\n        }<\/p>\n<p>        \/\/ Rule 5: High-volume Direct Data Center Hub Traffic with zero engagement\n        if (sourceMedium.toLowerCase().includes(\"(direct)\")) {\n            if (engagementRate === 0) {\n                botScore += 15;\n                flags.push(\"Unengaged Direct Traffic\");\n            }\n        }<\/p>\n<p>        return {\n            browser: browser,\n            os: os,\n            country: country,\n            sourceMedium: sourceMedium,\n            sessions: sessions,\n            pageviews: pageviews,\n            engagementRate: engagementRate,\n            bounceRate: bounceRate,\n            avgSessionDuration: avgSessionDuration,\n            viewsPerSession: viewsPerSession,\n            score: Math.min(botScore, 100),\n            flags: flags\n        };\n    };<\/p>\n<p>    const getSeverityBadge = (score) => {\n        if (score >= 80) {\n            return \"<span style='background:#471a1a; color:#ff6b6b; padding:4px 10px; border-radius:4px; font-size:0.75rem; font-weight:700; text-transform:uppercase;'>CRITICAL BOT (\" + score + \"%)<\/span>\";\n        }\n        if (score >= 60) {\n            return \"<span style='background:#4b3a1a; color:#ff922b; padding:4px 10px; border-radius:4px; font-size:0.75rem; font-weight:700; text-transform:uppercase;'>HIGH LIKELIHOOD (\" + score + \"%)<\/span>\";\n        }\n        return \"<span style='background:#242b30; color:#a0a6b0; padding:4px 10px; border-radius:4px; font-size:0.75rem; font-weight:700; text-transform:uppercase;'>MODERATE (\" + score + \"%)<\/span>\";\n    };<\/p>\n<p>    \/\/ 3. EXECUTE 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 timeframe = document.getElementById(\"ga4-timeframe\").value;\n        const minSessions = parseInt(document.getElementById(\"ga4-min-sessions\").value, 10) || 10;<\/p>\n<p>        if (!propertyId || isNaN(propertyId)) {\n            alert(\"Please enter a valid numeric GA4 Property ID (e.g., 345678901).\");\n            return;\n        }<\/p>\n<p>        runScanBtn.disabled = true;\n        runScanBtn.textContent = \"Scanning GA4 Traffic Cohorts...\";\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: timeframe, endDate: \"yesterday\" }],\n                    dimensions: [\n                        { name: \"browser\" },\n                        { name: \"operatingSystem\" },\n                        { name: \"country\" },\n                        { name: \"sessionSourceMedium\" }\n                    ],\n                    metrics: [\n                        { name: \"sessions\" },\n                        { name: \"screenPageViews\" },\n                        { name: \"engagementRate\" },\n                        { name: \"bounceRate\" },\n                        { name: \"averageSessionDuration\" }\n                    ],\n                    limit: 2500\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 ? data.rows : [];\n            const totalCohortsScanned = rows.length;<\/p>\n<p>            let totalSessionsScanned = 0;\n            let totalBotSessions = 0;\n            const botCohorts = [];<\/p>\n<p>            rows.forEach(row => {\n                const result = evaluateBotBehavior(row);\n                totalSessionsScanned += result.sessions;<\/p>\n<p>                if (result.sessions >= minSessions) {\n                    if (result.score >= 60) {\n                        botCohorts.push(result);\n                        totalBotSessions += result.sessions;\n                    }\n                }\n            });<\/p>\n<p>            \/\/ Sort by highest session impact first\n            botCohorts.sort((a, b) => b.sessions - a.sessions);<\/p>\n<p>            \/\/ 4. RENDER SUMMARY & BOT RESULTS\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;'>Total Traffic Cohorts Scanned<\/span>\",\n                \"    <strong style='color:var(--accent); font-size:1.4rem;'>\" + totalCohortsScanned.toLocaleString() + \" Segments<\/strong>\",\n                \"  <\/div>\n<p>\",\n                \"  <\/p>\n<div>\",\n                \"    <span style='color:var(--text-secondary); font-size:0.85rem; display:block;'>Total Sessions Evaluated<\/span>\",\n                \"    <strong style='color:var(--text-primary); font-size:1.4rem;'>\" + totalSessionsScanned.toLocaleString() + \" Sessions<\/strong>\",\n                \"  <\/div>\n<p>\",\n                \"  <\/p>\n<div>\",\n                \"    <span style='color:var(--text-secondary); font-size:0.85rem; display:block;'>Flagged Bot Traffic<\/span>\",\n                \"    <strong style='color:\" + (botCohorts.length > 0 ? \"#ff6b6b\" : \"#51cf66\") + \"; font-size:1.4rem;'>\" + totalBotSessions.toLocaleString() + \" Sessions (\" + botCohorts.length + \" Cohorts)<\/strong>\",\n                \"  <\/div>\n<p>\",\n                \"<\/p><\/div>\n<p>\"\n            ].join(\"\");<\/p>\n<p>            if (botCohorts.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 Clean Property: No automated crawler or ghost bot cohorts detected across \" + totalCohortsScanned + \" traffic segments!<\/div>\n<p>\";\n                return;\n            }<\/p>\n<p>            const cardsHtml = botCohorts.map(b => {\n                const flagsHtml = b.flags.map(f => [\n                    \"<span style='background:rgba(255,107,107,0.12); border:1px solid rgba(255,107,107,0.3); color:#ff6b6b; padding:4px 10px; border-radius:20px; font-size:0.8rem; font-weight:600;'>\" + esc(f) + \"<\/span>\"\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='flex:1; min-width:260px;'>\",\n                    \"      <\/p>\n<div style='color:var(--text-secondary); font-size:0.8rem; text-transform:uppercase; font-weight:700; margin-bottom:4px;'>\" + esc(b.country) + \" &bull; \" + esc(b.sourceMedium) + \"<\/div>\n<p>\",\n                    \"      <strong style='color:var(--text-primary); font-size:1.15rem; display:block;'>\" + esc(b.browser) + \" on \" + esc(b.os) + \"<\/strong>\",\n                    \"    <\/div>\n<p>\",\n                    \"    <\/p>\n<div style='text-align:right;'>\",\n                    \"      <\/p>\n<div style='color:var(--accent); font-weight:700; font-size:1.1rem; margin-bottom:4px;'>\" + b.sessions.toLocaleString() + \" sessions <span style='color:var(--text-secondary); font-size:0.85rem; font-weight:normal;'>(\" + b.pageviews.toLocaleString() + \" views)<\/span><\/div>\n<p>\",\n                    \"      \" + getSeverityBadge(b.score),\n                    \"    <\/p><\/div>\n<p>\",\n                    \"  <\/p><\/div>\n<p>\",\n                    \"  <\/p>\n<div style='display:flex; gap:20px; flex-wrap:wrap; margin-bottom:12px; font-family:monospace; font-size:0.85rem; color:var(--text-secondary);'>\",\n                    \"    <\/p>\n<div>Engagement: <strong style='color:\" + (b.engagementRate === 0 ? \"#ff6b6b\" : \"var(--text-primary)\") + \";'>\" + (b.engagementRate * 100).toFixed(1) + \"%<\/strong><\/div>\n<p>\",\n                    \"    <\/p>\n<div>Bounce Rate: <strong style='color:var(--text-primary);'>\" + (b.bounceRate * 100).toFixed(1) + \"%<\/strong><\/div>\n<p>\",\n                    \"    <\/p>\n<div>Avg Duration: <strong style='color:var(--text-primary);'>\" + b.avgSessionDuration.toFixed(1) + \"s<\/strong><\/div>\n<p>\",\n                    \"    <\/p>\n<div>Views\/Session: <strong style='color:var(--text-primary);'>\" + b.viewsPerSession.toFixed(2) + \"<\/strong><\/div>\n<p>\",\n                    \"  <\/p><\/div>\n<p>\",\n                    \"  <\/p>\n<div style='display:flex; gap:8px; flex-wrap:wrap; align-items:center;'>\",\n                    \"    <span style='color:var(--text-secondary); font-size:0.8rem; font-weight:600;'>Detected Indicators:<\/span>\",\n                    \"    \" + flagsHtml,\n                    \"  <\/div>\n<p>\",\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;'>Detected Bot &amp; Crawler Cohorts (\" + botCohorts.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;'>GA4 API Error: \" + esc(e.message) + \"<\/div>\n<p>\";\n        } finally {\n            runScanBtn.disabled = false;\n            runScanBtn.textContent = \"Scan Traffic for Bot Cohorts\";\n        }\n    });\n})();\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Decode cryptic GA4 gcd consent parameter strings into actionable storage states and update origins.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":38,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-tool-base.php","meta":{"footnotes":""},"class_list":["post-8816","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 Bot Detector - 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\/en\/toolbox\/ga4-bot-detector\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GA4 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