[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-what-is-debugging-and-why-it-matters-all--*":3,"academy-blog-translations-iv38no3i1be99at":71},{"data":4,"page":70,"perPage":70,"totalItems":70,"totalPages":70},[5],{"alt":6,"collectionId":7,"collectionName":8,"content":9,"cover_image":10,"cover_image_path":11,"created":12,"created_by":13,"expand":14,"id":65,"keywords":66,"locale":39,"published_at":67,"scheduled_at":13,"school_blog":61,"short_description":68,"status":59,"title":6,"updated":69,"updated_by":13,"slug":62,"views":64},"What Is Debugging? Why Good Programmers Must Be Great at Fixing Bugs.","sclblg987654321","school_blog_translations","\u003Cp>Writing code is not just about typing commands until it works, but sometimes the code might not function as expected. These issues are often referred to as \"bugs,\" which can arise from various causes, such as problems within the code itself, incorrect settings, or even improper usage. When a bug occurs, the key is to find the root cause and fix the issue to make the code work correctly again. This process is called \"debugging.\"\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2>What is Debugging?\u003C\u002Fh2>\u003Cp>The word “debug” comes from “de + bug”—literally meaning to remove bugs or eliminate errors in a program.\u003C\u002Fp>\u003Cp>When a computer program behaves incorrectly, we need to investigate what went wrong.\u003Cbr>Common causes include:\u003C\u002Fp>\u003Cul>\u003Cli>Incorrect logic in an \u003Ccode inline=\"\">if\u003C\u002Fcode> statement\u003C\u002Fli>\u003Cli>Calling functions in the wrong order\u003C\u002Fli>\u003Cli>Forgetting to close a tag or bracket\u003C\u002Fli>\u003Cli>Receiving \u003Ccode inline=\"\">null\u003C\u002Fcode> or missing data\u003C\u002Fli>\u003Cli>Accidentally overriding a variable without realizing it\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Debugging is like being a detective searching for clues in your code. Sometimes it's simple—like a missing semicolon. Other times, it's tricky—the error might not show up at all or appear in the wrong place entirely.\u003C\u002Fp>\u003Ch3>Why Is Debugging Necessary?\u003C\u002Fh3>\u003Cp>Because:\u003C\u002Fp>\u003Cul>\u003Cli>Programmers are human — and humans make mistakes.\u003C\u002Fli>\u003Cli>Code might work in one condition but break in another.\u003C\u002Fli>\u003Cli>Incoming data may not match what the program expects.\u003C\u002Fli>\u003Cli>Complex systems can easily break — even with small changes.\u003C\u002Fli>\u003C\u002Ful>\u003Cp>That’s why, no matter how skilled you are, there will always be days when your code has bugs.\u003Cbr>Debugging is an essential foundational skill that every programmer must have.\u003C\u002Fp>\u003Ch3>So, What Is a “Bug”?\u003C\u002Fh3>\u003Cp>A bug is simply an error in your code.\u003Cbr>It can come from many causes, such as:\u003C\u002Fp>\u003Cul>\u003Cli>A typo\u003C\u002Fli>\u003Cli>Incorrect logic (e.g., a mistake in \u003Ccode inline=\"\">if\u002Felse\u003C\u002Fcode> conditions)\u003C\u002Fli>\u003Cli>Using a variable before it’s defined (\u003Ccode inline=\"\">undefined\u003C\u002Fcode>, \u003Ccode inline=\"\">null\u003C\u002Fcode>)\u003C\u002Fli>\u003Cli>Calling the wrong kind of function (e.g., wrong loop type)\u003C\u002Fli>\u003Cli>Sending data in the wrong format (e.g., expecting a number but getting a string)\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Simple Example:\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext language-js\">const sum = (a, b) => a + b;\n\nconsole.log(sum(\"1\", 2)); \u002F\u002F Output: \"12\" instead of 3\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>In this case, JavaScript treats \u003Ccode inline=\"\">\"1\"\u003C\u002Fcode> as a string and uses string concatenation, so \u003Ccode inline=\"\">\"1\" + 2\u003C\u002Fcode> becomes \u003Ccode inline=\"\">\"12\"\u003C\u002Fcode> instead of performing a numerical addition.\u003C\u002Fp>\u003Cp>This is a classic bug — and one that developers must learn to spot and fix.\u003C\u002Fp>\u003Ch3>Basic Steps for Debugging (Made Simple)\u003C\u002Fh3>\u003Cp> \u003C\u002Fp>\u003Cfigure class=\"image image_resized\" style=\"width:75%;\">\u003Cimg style=\"aspect-ratio:6000\u002F6000;\" src=\"https:\u002F\u002Fimagedelivery.net\u002Fg5Z0xlCQah-oO61sLqaEUA\u002F12_11zon_0f173ea56c\u002Ftwsme\" alt=\"Basic Steps for Debugging\" width=\"6000\" height=\"6000\">\u003C\u002Ffigure>\u003Cp> \u003C\u002Fp>\u003Cp>When your code doesn’t work as expected, don’t rush to fix it right away. The first step is to clearly understand what’s going wrong. Debugging isn’t as complicated as it seems — it just takes patience and curiosity to investigate where the problem lies.\u003C\u002Fp>\u003Ch4>1. Observe the Problem Clearly\u003C\u002Fh4>\u003Cp>Start by taking a breath and asking: \u003Ci>“Where exactly is it failing?”\u003C\u002Fi>\u003C\u002Fp>\u003Cul>\u003Cli>Did the button do nothing when clicked?\u003C\u002Fli>\u003Cli>Was the displayed data wrong — or not showing at all?\u003C\u002Fli>\u003Cli>Did the app freeze or crash unexpectedly?\u003C\u002Fli>\u003Cli>Was there an error message?\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Example:\u003Cbr>You created a sign-up form and clicked “Submit” — but nothing happened.\u003Cbr>This is a clear symptom. Now ask:\u003Cbr>→ Did the data fail to send?\u003Cbr>→ Or did it send but return an error?\u003C\u002Fp>\u003Ch4>2.  Form a Hypothesis: What Might Be Broken?\u003C\u002Fh4>\u003Cp>Think like a detective: \u003Ci>What’s the most likely cause?\u003C\u002Fi>\u003C\u002Fp>\u003Cp>Ask yourself:\u003C\u002Fp>\u003Cul>\u003Cli>Which file or function was recently edited?\u003C\u002Fli>\u003Cli>Which variables are involved in this action?\u003C\u002Fli>\u003Cli>Did it work before? Or has it been broken from the start?\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Example:\u003Cbr>Maybe the function wasn’t connected to the button correctly,\u003Cbr>or perhaps the data sent to the server is empty.\u003C\u002Fp>\u003Ch4>3. Check Each Part Using Basic Tools\u003C\u002Fh4>\u003Cp>Begin stepping through your code in an organized way.\u003C\u002Fp>\u003Cp>Popular tools include:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Ccode inline=\"\">console.log()\u003C\u002Fcode> (JavaScript), \u003Ccode inline=\"\">print()\u003C\u002Fcode> (Python), \u003Ccode inline=\"\">fmt.Println()\u003C\u002Fcode> (Go) → View variable values\u003C\u002Fli>\u003Cli>Breakpoints → Pause and inspect values at runtime\u003C\u002Fli>\u003Cli>Error Messages → Usually show the problem and the exact line\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Example:\u003Cbr>You log the data just before sending it:\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext language-js\">console.log(data);\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>And you see \u003Ccode inline=\"\">data = undefined\u003C\u002Fcode>\u003Cbr>→ This tells you the value wasn’t retrieved from the form correctly → Check the form input.\u003C\u002Fp>\u003Ch4>4. Isolate the Problem and Test in Small Steps\u003C\u002Fh4>\u003Cp>Don’t fix everything at once.\u003Cbr>Make one change at a time and observe the result.\u003C\u002Fp>\u003Cp>Techniques:\u003C\u002Fp>\u003Cul>\u003Cli>Comment out unrelated code\u003C\u002Fli>\u003Cli>Change specific values and test again\u003C\u002Fli>\u003Cli>If the code is long, split it into smaller parts and run them separately\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Example:\u003Cbr>Change from:\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext language-js\">data = userInput.value.trim();\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>To:\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext language-js\">console.log(userInput);\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>Then discover \u003Ccode inline=\"\">userInput = null\u003C\u002Fcode>\u003Cbr>→ It means the button isn’t linked to the input field at all.\u003C\u002Fp>\u003Ch4>5. Document What You Learned to Prevent It Later\u003C\u002Fh4>\u003Cp>Debugging isn’t just about fixing things — it’s also about learning how to avoid making the same mistake again.\u003C\u002Fp>\u003Cul>\u003Cli>Write down what caused the bug (e.g. “Forgot to connect input with JS”)\u003C\u002Fli>\u003Cli>Add a comment in the code as a reminder\u003C\u002Fli>\u003Cli>If the issue is common, create a personal debugging checklist for future reference\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Example Note:\u003C\u002Fp>\u003Cblockquote>\u003Cp>“Next time, double-check that the input is properly connected to JavaScript before form submission.”\u003C\u002Fp>\u003C\u002Fblockquote>\u003Ch3>Common Debugging Tools Developers Use\u003C\u002Fh3>\u003Cul>\u003Cli>Console.log \u002F Print – Quick and effective for inspecting values\u003C\u002Fli>\u003Cli>Debugger (e.g., VS Code) – Step through your code line by line\u003C\u002Fli>\u003Cli>Error Messages – Read carefully to get hints\u003C\u002Fli>\u003Cli>Stack Trace – Shows the path the code followed before crashing\u003C\u002Fli>\u003Cli>AI tools (e.g., ChatGPT) – Help interpret error messages and suggest fixes\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2>Why Is Debugging an Essential Skill for Every Programmer?\u003C\u002Fh2>\u003Cp>In the real world, no code runs perfectly on the first try.\u003Cbr>Even if you're a highly skilled coder, you'll still run into bugs.\u003C\u002Fp>\u003Cblockquote>\u003Cp>A great programmer isn’t someone who never creates bugs —\u003Cbr>It’s someone who can find and fix them quickly.\u003C\u002Fp>\u003C\u002Fblockquote>\u003Ch3> Without Debugging Skills, You Might…\u003C\u002Fh3>\u003Cul>\u003Cli>Make random fixes that don’t solve the root problem\u003C\u002Fli>\u003Cli>Waste time guessing or trying things blindly\u003C\u002Fli>\u003Cli>Spend hours stuck on a small issue\u003C\u002Fli>\u003Cli>Worst of all — feel discouraged and give up\u003C\u002Fli>\u003C\u002Ful>\u003Ch3>With Good Debugging Skills, You Can…\u003C\u002Fh3>\u003Cul>\u003Cli>Quickly identify the most likely points of failure\u003C\u002Fli>\u003Cli>Use tools like \u003Ccode inline=\"\">console.log()\u003C\u002Fcode>, breakpoints, or debuggers with confidence\u003C\u002Fli>\u003Cli>Understand stack traces and error messages efficiently\u003C\u002Fli>\u003Cli>Save time and earn trust from your team\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch3>Basic Debugging Techniques Every Beginner Should Know\u003C\u002Fh3>\u003Col>\u003Cli>Read the Error Message Carefully\u003Cbr>It often tells you the line number and what kind of error occurred\u003Cbr>e.g. \u003Ccode inline=\"\">TypeError: undefined is not a function\u003C\u002Fcode>\u003C\u002Fli>\u003Cli>Use \u003Ccode inline=\"\">console.log()\u003C\u002Fcode> or \u003Ccode inline=\"\">print()\u003C\u002Fcode> to Inspect Variables\u003Cbr>Check the values being passed through your program step-by-step\u003C\u002Fli>\u003Cli>Follow the Data Flow\u003Cbr>For example:\u003Cbr>Form input → API request → Database → Display result\u003C\u002Fli>\u003Cli>Temporarily Remove Suspicious Code\u003Cbr>Comment out parts of the code to isolate the issue\u003Cbr>(e.g. a function that may be causing the error)\u003C\u002Fli>\u003Cli>Ask AI Tools to Explain the Error\u003Cbr>Copy and paste the error message into ChatGPT and get a human-friendly explanation or possible fix\u003C\u002Fli>\u003C\u002Fol>\u003Cp> \u003C\u002Fp>\u003Chr>\u003Ch2>Summary\u003C\u002Fh2>\u003Cp>Debugging is a core skill that every programmer must develop. It's not just about fixing things — it’s about truly understanding how your code works.\u003C\u002Fp>\u003Cblockquote>\u003Cp>The better you get at debugging, the better you’ll get at coding.\u003C\u002Fp>\u003C\u002Fblockquote>\u003Cp>So if you want to be a great coder, start by being brave enough to break things — and skilled enough to fix them.\u003C\u002Fp>\u003Cp>🔵 Facebook: \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.facebook.com\u002Fsuperdev.school.th\">\u003Cstrong>Superdev School  (Superdev)\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003Cp>📸 Instagram: \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.instagram.com\u002Fsuperdevschool\u002F\">\u003Cstrong>superdevschool\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003Cp>🎬 TikTok: \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.tiktok.com\u002F@superdevschool\">\u003Cstrong>superdevschool\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003Cp class=\"\" data-start=\"5978\" data-end=\"6095\">🌐 Website: \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdev.school\u002F\">\u003Cstrong>www.superdev.school\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>","4_11zon_ey32sjtz06.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002F03pnsehp4oa7izy\u002F4_11zon_ey32sjtz06.webp","2026-03-04 08:48:59.702Z","",{"keywords":15,"locale":33,"school_blog":43},[16,23,28],{"collectionId":17,"collectionName":18,"created":19,"created_by":13,"id":20,"name":21,"updated":22,"updated_by":13},"sclkey987654321","school_keywords","2026-03-04 08:48:58.135Z","kn0l8xlkd3eb2pn","beginner coding guide","2026-04-10 16:13:56.888Z",{"collectionId":17,"collectionName":18,"created":24,"created_by":13,"id":25,"name":26,"updated":27,"updated_by":13},"2026-03-04 08:48:59.284Z","qoql9zjevvd3evf","Bug Fixing","2026-04-10 16:13:57.030Z",{"collectionId":17,"collectionName":18,"created":29,"created_by":13,"id":30,"name":31,"updated":32,"updated_by":13},"2026-03-04 08:46:40.078Z","26nqir3wf6rlsa1","Debugging","2026-04-10 16:13:17.225Z",{"code":34,"collectionId":35,"collectionName":36,"created":37,"flag":38,"id":39,"is_default":40,"label":41,"updated":42},"en","pbc_1989393366","locales","2026-01-22 11:00:02.726Z","twemoji:flag-united-states","qv9c1llfov2d88z",false,"English","2026-04-10 15:42:46.825Z",{"category":44,"collectionId":45,"collectionName":46,"created":13,"expand":47,"id":61,"slug":62,"updated":63,"views":64},"spm4l1k5bgmhmmt","pbc_2105096300","school_blogs",{"category":48},{"blogIds":49,"collectionId":50,"collectionName":51,"created":52,"created_by":13,"id":44,"image":53,"image_alt":13,"image_path":54,"label":55,"name":56,"priority":57,"publish_at":58,"scheduled_at":13,"status":59,"updated":60,"updated_by":13},[],"sclcatblg987654321","school_category_blogs","2026-03-04 08:31:18.590Z","50hyjr6os45_ayazwr5gq7.png","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclcatblg987654321\u002Fspm4l1k5bgmhmmt\u002F50hyjr6os45_ayazwr5gq7.png",{"en":56,"th":56},"Knowledge",0,"2026-03-18 02:25:41.222Z","published","2026-04-25 02:32:14.497Z","iv38no3i1be99at","what-is-debugging-and-why-it-matters","2026-05-11 16:08:10.996Z",219,"03pnsehp4oa7izy",[20,25,30],"2025-06-18 11:26:42.529Z","Learn what debugging really means and why it's an essential skill for every developer who wants to write clean and reliable code.","2026-04-22 07:10:17.503Z",1,{"th":62,"en":62}]