[{"data":1,"prerenderedAt":830},["ShallowReactive",2],{"announcement":3,"i-tabler:sun":11,"i-tabler:moon":16,"i-tabler:menu-2":18,"i-tabler:x":20,"i-simple-icons:youtube":22,"i-simple-icons:github":24,"i-simple-icons:x":26,"i-simple-icons:linkedin":28,"i-tabler:arrow-up-right":31,"post-javascript-analysis-masterclass-pt2":33,"post-nav-javascript-analysis-masterclass-pt2":808,"video-javascript-analysis-masterclass-pt2":820,"i-tabler:copy":828},{"startsAt":4,"endsAt":5,"scramble":6,"cta":7,"message":10},"2026-10-13","2026-11-30","Cache Poisoning:",{"href":8,"label":9},"\u002Fcache-poisoning-the-cache-you-cant-purge","Read it","The cache you can't purge.",{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":15},0,24,false,"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 12a4 4 0 1 0 8 0a4 4 0 1 0-8 0m-5 0h1m8-9v1m8 8h1m-9 8v1M5.6 5.6l.7.7m12.1-.7l-.7.7m0 11.4l.7.7m-12.1-.7l-.7.7\"\u002F>",{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":17},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M12 3h.393a7.5 7.5 0 0 0 7.92 12.446A9 9 0 1 1 12 2.992z\"\u002F>",{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":19},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M4 6h16M4 12h16M4 18h16\"\u002F>",{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":21},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M18 6L6 18M6 6l12 12\"\u002F>",{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":23},"\u003Cpath fill=\"currentColor\" d=\"M23.498 6.186a3.02 3.02 0 0 0-2.122-2.136C19.505 3.545 12 3.545 12 3.545s-7.505 0-9.377.505A3.02 3.02 0 0 0 .502 6.186C0 8.07 0 12 0 12s0 3.93.502 5.814a3.02 3.02 0 0 0 2.122 2.136c1.871.505 9.376.505 9.376.505s7.505 0 9.377-.505a3.02 3.02 0 0 0 2.122-2.136C24 15.93 24 12 24 12s0-3.93-.502-5.814M9.545 15.568V8.432L15.818 12z\"\u002F>",{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":25},"\u003Cpath fill=\"currentColor\" d=\"M12 .297c-6.63 0-12 5.373-12 12c0 5.303 3.438 9.8 8.205 11.385c.6.113.82-.258.82-.577c0-.285-.01-1.04-.015-2.04c-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729c1.205.084 1.838 1.236 1.838 1.236c1.07 1.835 2.809 1.305 3.495.998c.108-.776.417-1.305.76-1.605c-2.665-.3-5.466-1.332-5.466-5.93c0-1.31.465-2.38 1.235-3.22c-.135-.303-.54-1.523.105-3.176c0 0 1.005-.322 3.3 1.23c.96-.267 1.98-.399 3-.405c1.02.006 2.04.138 3 .405c2.28-1.552 3.285-1.23 3.285-1.23c.645 1.653.24 2.873.12 3.176c.765.84 1.23 1.91 1.23 3.22c0 4.61-2.805 5.625-5.475 5.92c.42.36.81 1.096.81 2.22c0 1.606-.015 2.896-.015 3.286c0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12\"\u002F>",{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":27},"\u003Cpath fill=\"currentColor\" d=\"M14.234 10.162L22.977 0h-2.072l-7.591 8.824L7.251 0H.258l9.168 13.343L.258 24H2.33l8.016-9.318L16.749 24h6.993zm-2.837 3.299l-.929-1.329L3.076 1.56h3.182l5.965 8.532l.929 1.329l7.754 11.09h-3.182z\"\u002F>",{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":29,"hidden":30},"\u003Cpath fill=\"currentColor\" d=\"M20.447 20.452h-3.554v-5.569c0-1.328-.027-3.037-1.852-3.037c-1.853 0-2.136 1.445-2.136 2.939v5.667H9.351V9h3.414v1.561h.046c.477-.9 1.637-1.85 3.37-1.85c3.601 0 4.267 2.37 4.267 5.455v6.286zM5.337 7.433a2.06 2.06 0 0 1-2.063-2.065a2.064 2.064 0 1 1 2.063 2.065m1.782 13.019H3.555V9h3.564zM22.225 0H1.771C.792 0 0 .774 0 1.729v20.542C0 23.227.792 24 1.771 24h20.451C23.2 24 24 23.227 24 22.271V1.729C24 .774 23.2 0 22.222 0z\"\u002F>",true,{"left":12,"top":12,"width":13,"height":13,"rotate":12,"vFlip":14,"hFlip":14,"body":32},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M17 7L7 17M8 7h9v9\"\u002F>",{"id":34,"title":35,"body":36,"categories":795,"coverImage":798,"date":799,"description":800,"draft":14,"extension":801,"meta":802,"navigation":30,"noindex":14,"path":803,"readingTime":804,"seo":805,"slug":806,"stem":806,"updatedAt":804,"youtubeId":42,"__hash__":807},"blog\u002Fjavascript-analysis-masterclass-pt2.md","JavaScript Analysis Masterclass - Part 2",{"type":37,"value":38,"toc":767},"minimark",[39,43,52,59,71,97,102,108,123,128,159,163,217,221,241,244,248,251,257,261,280,283,294,296,300,303,310,334,337,339,343,349,395,398,400,404,407,438,442,453,460,462,466,469,473,493,496,507,510,512,516,519,564,568,579,584,622,625,632,634,638,644,647,658,661,691,697,699,703,706,710,724,727,731,738,744,747,760,763],[40,41],"post-media",{"video":42},"FpX_4CSDzSM",[44,45,46,47,51],"p",{},"Client-side JavaScript is no longer just a recon artifact. It’s an ",[48,49,50],"strong",{},"active attack surface",".",[44,53,54,55,58],{},"While static analysis can reveal endpoints, secrets, and tokens, the real vulnerabilities often appear ",[48,56,57],{},"when the code runs",". That’s where runtime analysis comes in, opening doors to logic flaws, role manipulation, DOM-based XSS, and internal function abuse directly from your browser.",[44,60,61,62,66,67,70],{},"In this advanced walkthrough, we’ll dissect how to move beyond ",[63,64,65],"code",{},"js-beautify"," and dive into ",[48,68,69],{},"runtime debugging, obfuscation unpacking, local overrides, and DevTools exploitation techniques"," that help turn recon into actionable bugs.",[72,73,74],"blockquote",{},[44,75,76,77,80,81,84,85,87,88],{},"🧪 Want to practice these techniques hands-on?",[78,79],"br",{},"\nCheck out the full ",[48,82,83],{},"GitHub lab"," here:",[78,86],{},"\n👉 ",[89,90,96],"a",{"href":91,"rel":92,"target":95},"https:\u002F\u002Fgithub.com\u002Famrelsagaei\u002FJavaScript-Analysis-Masterclass-Lab?utm_source=amrelsagaei.com&utm_medium=referral",[93,94],"noopener","noreferrer","_blank","https:\u002F\u002Fgithub.com\u002Famrelsagaei\u002FJavaScript-Analysis-Masterclass-Lab",[98,99,101],"h2",{"id":100},"live-debugging-with-devtools","Live Debugging with DevTools",[44,103,104,105,51],{},"You’ve got the JS. Now let’s watch it ",[48,106,107],{},"breathe",[44,109,110,111,114,115,118,119,122],{},"Open ",[48,112,113],{},"DevTools"," (",[63,116,117],{},"F12","). This is your ",[48,120,121],{},"entry into the live heartbeat"," of any web app.",[124,125,127],"h3",{"id":126},"use-devtools-to","Use DevTools To:",[129,130,131,139,145,151],"ul",{},[132,133,134,135,138],"li",{},"Set ",[48,136,137],{},"breakpoints"," in JS execution",[132,140,141,144],{},[48,142,143],{},"Track event handlers"," (clicks, inputs, form actions)",[132,146,147,150],{},[48,148,149],{},"Modify variables live"," (flip flags, tweak payloads)",[132,152,153,154,158],{},"Inject payloads into logic ",[155,156,157],"em",{},"before"," they’re processed",[124,160,162],{"id":161},"step-by-step","Step-by-Step:",[164,165,166,172,178,188,195,201,208,214],"ol",{},[132,167,168,169],{},"Open app in ",[48,170,171],{},"Chrome",[132,173,174,175],{},"Right-click → ",[48,176,177],{},"Inspect",[132,179,110,180,183,184,187],{},[48,181,182],{},"Event Listeners"," → Find relevant handler (e.g., ",[63,185,186],{},"click",")",[132,189,190,191,194],{},"Jump to ",[48,192,193],{},"Sources"," tab",[132,196,197,198],{},"Set a ",[48,199,200],{},"breakpoint",[132,202,203,204,207],{},"Trigger event → app ",[48,205,206],{},"freezes"," on that logic",[132,209,110,210,213],{},[48,211,212],{},"Scope",", modify variables",[132,215,216],{},"Resume execution, with your payload in place",[124,218,220],{"id":219},"real-world-use-cases","Real-World Use Cases:",[129,222,223,229,235,238],{},[132,224,225,226],{},"Modify ",[63,227,228],{},"isAdmin = true",[132,230,231,232,234],{},"Edit JWT payload ",[155,233,157],{}," it's signed",[132,236,237],{},"Inject into frontend filters",[132,239,240],{},"Trigger DOM-based XSS through runtime input tampering",[242,243],"hr",{},[98,245,247],{"id":246},"local-overrides-in-chrome","Local Overrides in Chrome",[44,249,250],{},"Want changes to persist across refreshes?",[44,252,253,254,51],{},"Chrome makes it possible with ",[48,255,256],{},"Local Overrides",[124,258,260],{"id":259},"how-to-use","How to Use:",[164,262,263,268,271,274,277],{},[132,264,265],{},[63,266,267],{},"DevTools → Sources → Overrides",[132,269,270],{},"Grant folder access",[132,272,273],{},"Open your target JS file",[132,275,276],{},"Modify + Save",[132,278,279],{},"Refresh, changes stay",[44,281,282],{},"Now you can:",[129,284,285,288,291],{},[132,286,287],{},"Remove input filters",[132,289,290],{},"Inject payloads into static logic",[132,292,293],{},"Log internal variables directly in production JS",[242,295],{},[98,297,299],{"id":298},"spotting-obfuscation-in-the-wild","Spotting Obfuscation in the Wild",[44,301,302],{},"Some JS files don’t want to be understood.",[44,304,305,306,309],{},"Signs of ",[48,307,308],{},"obfuscation",":",[129,311,312,318,321,324],{},[132,313,314,315],{},"Weird variable names like ",[63,316,317],{},"_0xabc123",[132,319,320],{},"Packed arrays with hex indexing",[132,322,323],{},"Single-line minified chaos",[132,325,326,327,330,331],{},"Use of ",[63,328,329],{},"eval()"," or ",[63,332,333],{},"new Function()",[44,335,336],{},"These break static tools, but not you.",[242,338],{},[98,340,342],{"id":341},"beautify-the-code-cli","Beautify the Code (CLI)",[44,344,345,346],{},"First step: ",[48,347,348],{},"Make it readable.",[350,351,356],"pre",{"code":352,"language":353,"meta":354,"className":355,"style":354},"pip install jsbeautifier\n\njs-beautify file.min.js > file.pretty.js\n","bash","","shiki shiki-themes vitesse-dark vitesse-light",[63,357,358,374,380],{},[359,360,363,367,371],"span",{"class":361,"line":362},"line",1,[359,364,366],{"class":365},"swzfi","pip",[359,368,370],{"class":369},"sRRDT"," install",[359,372,373],{"class":369}," jsbeautifier\n",[359,375,377],{"class":361,"line":376},2,[359,378,379],{"emptyLinePlaceholder":30},"\n",[359,381,383,385,388,392],{"class":361,"line":382},3,[359,384,65],{"class":365},[359,386,387],{"class":369}," file.min.js",[359,389,391],{"class":390},"sfIIG"," >",[359,393,394],{"class":369}," file.pretty.js\n",[44,396,397],{},"Now you’ve got indentation and logical flow, the first step to live debugging or decryption.",[242,399],{},[98,401,403],{"id":402},"runtime-unpacking-decoding-arrays","Runtime Unpacking: Decoding Arrays",[44,405,406],{},"Ever seen this?",[350,408,411],{"code":409,"language":410,"meta":354,"className":355,"style":354},"return arr[0x14]; \u002F\u002F returns “JWS”\n","javascript",[63,412,413],{},[359,414,415,419,423,427,431,434],{"class":361,"line":362},[359,416,418],{"class":417},"sR8n-","return",[359,420,422],{"class":421},"snInM"," arr",[359,424,426],{"class":425},"somML","[",[359,428,430],{"class":429},"sUQhE","0x14",[359,432,433],{"class":425},"];",[359,435,437],{"class":436},"sy60D"," \u002F\u002F returns “JWS”\n",[124,439,441],{"id":440},"how-to-decode","How to Decode:",[164,443,444,447,450],{},[132,445,446],{},"Set breakpoint on the return line",[132,448,449],{},"Observe how the array is populated",[132,451,452],{},"Rebuild the logic manually or override values via Scope",[44,454,455,456,459],{},"This is ",[48,457,458],{},"live reverse engineering",": in the browser.",[242,461],{},[98,463,465],{"id":464},"ai-powered-js-analysis","AI-Powered JS Analysis",[44,467,468],{},"Don’t underestimate AI. Use it against itself.",[124,470,472],{"id":471},"try","Try:",[129,474,475,481,487],{},[132,476,477,480],{},[48,478,479],{},"Claude"," (best for logic explanation)",[132,482,483,486],{},[48,484,485],{},"GPT-4"," (best for structured summaries)",[132,488,489,492],{},[48,490,491],{},"DeepSeek"," (great for logic mapping)",[44,494,495],{},"Ask:",[129,497,498,501,504],{},[132,499,500],{},"“Explain this loop”",[132,502,503],{},"“What does this function return?”",[132,505,506],{},"“Can this be bypassed?”",[44,508,509],{},"AI is your pair programmer now, especially against obfuscated JS.",[242,511],{},[98,513,515],{"id":514},"advanced-exploitation-internal-function-abuse","Advanced Exploitation: Internal Function Abuse",[44,517,518],{},"Sometimes devs leave internal helpers like:",[350,520,522],{"code":521,"language":410,"meta":354,"className":355,"style":354},"sendMessage('token', 'user', 'payload');\n",[63,523,524],{},[359,525,526,529,532,536,539,541,544,547,550,552,554,556,559,561],{"class":361,"line":362},[359,527,528],{"class":365},"sendMessage",[359,530,531],{"class":425},"(",[359,533,535],{"class":534},"sy_C3","'",[359,537,538],{"class":369},"token",[359,540,535],{"class":534},[359,542,543],{"class":425},",",[359,545,546],{"class":534}," '",[359,548,549],{"class":369},"user",[359,551,535],{"class":534},[359,553,543],{"class":425},[359,555,546],{"class":534},[359,557,558],{"class":369},"payload",[359,560,535],{"class":534},[359,562,563],{"class":425},");\n",[124,565,567],{"id":566},"with-a-breakpoint-you-can","With a Breakpoint, You Can:",[129,569,570,573,576],{},[132,571,572],{},"Change roles",[132,574,575],{},"Modify messages",[132,577,578],{},"Trigger internal logic manually",[44,580,581],{},[48,582,583],{},"Example:",[350,585,587],{"code":586,"language":410,"meta":354,"className":355,"style":354},"sendMessage('admin', 'support', 'inject');\n",[63,588,589],{},[359,590,591,593,595,597,600,602,604,606,609,611,613,615,618,620],{"class":361,"line":362},[359,592,528],{"class":365},[359,594,531],{"class":425},[359,596,535],{"class":534},[359,598,599],{"class":369},"admin",[359,601,535],{"class":534},[359,603,543],{"class":425},[359,605,546],{"class":534},[359,607,608],{"class":369},"support",[359,610,535],{"class":534},[359,612,543],{"class":425},[359,614,546],{"class":534},[359,616,617],{"class":369},"inject",[359,619,535],{"class":534},[359,621,563],{"class":425},[44,623,624],{},"Boom. You've impersonated an admin, bypassed auth logic, or triggered a hidden feature.",[44,626,627,628,631],{},"This is where ",[48,629,630],{},"XSS, logic bugs, IDORs"," all live.",[242,633],{},[98,635,637],{"id":636},"final-validation-cross-tool-proofing","Final Validation & Cross-Tool Proofing",[44,639,640,641],{},"Found something cool? ",[48,642,643],{},"Validate before you report.",[124,645,495],{"id":646},"ask",[129,648,649,652,655],{},[132,650,651],{},"Is it exploitable in production?",[132,653,654],{},"Can I reproduce it reliably?",[132,656,657],{},"Can I show real-world impact?",[44,659,660],{},"Then use:",[129,662,663,669,675,685],{},[132,664,665,668],{},[63,666,667],{},"httpx"," to test endpoints",[132,670,671,674],{},[63,672,673],{},"curl"," to replay requests",[132,676,677,680,681,684],{},[63,678,679],{},"ffuf"," \u002F ",[63,682,683],{},"arjun"," to fuzz parameters",[132,686,687,690],{},[63,688,689],{},"nuclei"," to scan for known issues",[44,692,693,694,51],{},"This builds credibility and ",[48,695,696],{},"avoids false positives",[242,698],{},[98,700,702],{"id":701},"reporting-it-right","Reporting It Right",[44,704,705],{},"Found something? Now make it shine.",[124,707,709],{"id":708},"a-strong-report-includes","A Strong Report Includes:",[164,711,712,715,718,721],{},[132,713,714],{},"High-impact summary",[132,716,717],{},"Clear PoC (steps + tools used)",[132,719,720],{},"Screenshots or video",[132,722,723],{},"Suggested fix or CWE reference",[44,725,726],{},"Good writing = Faster triage = Bigger bounties.",[98,728,730],{"id":729},"conclusion","Conclusion",[44,732,733,734,737],{},"Mastering JavaScript runtime analysis means more than pulling files and parsing code. It’s about ",[48,735,736],{},"understanding how the app behaves under pressure",", and how logic unravels when user input meets insecure execution.",[44,739,740,741,51],{},"Whether you're a bug bounty hunter, red teamer, or appsec researcher, this skill separates those who read JS from those who ",[48,742,743],{},"break it",[44,745,746],{},"Dive into the full lab on GitHub, try these techniques, and apply them on real-world apps.",[72,748,749],{},[44,750,751,752,756],{},"🔗 ",[89,753,755],{"href":91,"rel":754,"target":95},[93,94],"GitHub Lab:",[89,757,759],{"href":91,"rel":758,"target":95},[93,94],"JavaScript Analysis Masterclass",[44,761,762],{},"Stay sharp, hack smart, and keep pushing boundaries.",[764,765,766],"style",{},"html pre.shiki code .swzfi, html code.shiki .swzfi{--shiki-default:#80A665;--shiki-light:#59873A}html pre.shiki code .sRRDT, html code.shiki .sRRDT{--shiki-default:#C98A7D;--shiki-light:#B56959}html pre.shiki code .sfIIG, html code.shiki .sfIIG{--shiki-default:#CB7676;--shiki-light:#AB5959}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html pre.shiki code .sR8n-, html code.shiki .sR8n-{--shiki-default:#4D9375;--shiki-light:#1E754F}html pre.shiki code .snInM, html code.shiki .snInM{--shiki-default:#BD976A;--shiki-light:#B07D48}html pre.shiki code .somML, html code.shiki .somML{--shiki-default:#666666;--shiki-light:#999999}html pre.shiki code .sUQhE, html code.shiki .sUQhE{--shiki-default:#4C9A91;--shiki-light:#2F798A}html pre.shiki code .sy60D, html code.shiki .sy60D{--shiki-default:#758575DD;--shiki-light:#A0ADA0}html pre.shiki code .sy_C3, html code.shiki .sy_C3{--shiki-default:#C98A7D77;--shiki-light:#B5695977}",{"title":354,"searchDepth":382,"depth":382,"links":768},[769,774,777,778,779,782,785,788,791,794],{"id":100,"depth":376,"text":101,"children":770},[771,772,773],{"id":126,"depth":382,"text":127},{"id":161,"depth":382,"text":162},{"id":219,"depth":382,"text":220},{"id":246,"depth":376,"text":247,"children":775},[776],{"id":259,"depth":382,"text":260},{"id":298,"depth":376,"text":299},{"id":341,"depth":376,"text":342},{"id":402,"depth":376,"text":403,"children":780},[781],{"id":440,"depth":382,"text":441},{"id":464,"depth":376,"text":465,"children":783},[784],{"id":471,"depth":382,"text":472},{"id":514,"depth":376,"text":515,"children":786},[787],{"id":566,"depth":382,"text":567},{"id":636,"depth":376,"text":637,"children":789},[790],{"id":646,"depth":382,"text":495},{"id":701,"depth":376,"text":702,"children":792},[793],{"id":708,"depth":382,"text":709},{"id":729,"depth":376,"text":730},[796,797],"Bug Bounty","Penetration Testing","\u002Fimages\u002Fblog\u002Fjavascript-analysis-masterclass-pt2\u002Fjs-analysis-masterclass-pt2.webp","2025-05-23","Static analysis finds endpoints and secrets; runtime analysis finds the bugs. 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