{"record":{"id":"bcb33df0d0d8e3fc","repo":"AykutSarac/jsoncrack.com","slug":"an-error-occurred-while-reading-the-file","errorCode":null,"errorMessage":"An error occurred while reading the file.","messagePattern":"An error occurred while reading the file\\.","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"apps/www/src/features/editor/FullscreenDropzone.tsx","lineNumber":24,"sourceCode":"import { FileFormat } from \"../../enums/file.enum\";\nimport useFile from \"../../store/useFile\";\n\nexport const FullscreenDropzone = () => {\n  const setContents = useFile(state => state.setContents);\n\n  return (\n    <Dropzone.FullScreen\n      maxFiles={1}\n      accept={[\"application/json\", \"application/x-yaml\", \"text/csv\", \"application/xml\"]}\n      onReject={files => toast.error(`Unable to load file ${files[0].file.name}`)}\n      onDrop={async e => {\n        try {\n          const fileContent = await e[0].text();\n          let fileExtension = e[0].name.split(\".\").pop() as FileFormat | undefined;\n          if (!fileExtension) fileExtension = FileFormat.JSON;\n          setContents({ contents: fileContent, format: fileExtension, hasChanges: false });\n        } catch (err) {\n          toast.error(\"An error occurred while reading the file.\");\n          console.error(err);\n        }\n      }}\n    >\n      <Group\n        justify=\"center\"\n        ta=\"center\"\n        align=\"center\"\n        gap=\"xl\"\n        h=\"100vh\"\n        style={{ pointerEvents: \"none\" }}\n      >\n        <Dropzone.Accept>\n          <VscFiles size={100} />\n          <Text fz=\"h1\" fw={500} mt=\"lg\">\n            Upload to JSON Crack\n          </Text>\n          <Text fz=\"lg\" c=\"dimmed\" mt=\"sm\">","sourceCodeStart":6,"sourceCodeEnd":42,"githubUrl":"https://github.com/AykutSarac/jsoncrack.com/blob/3c9af69e23c635356293b6b28cf4cd0af10d1059/apps/www/src/features/editor/FullscreenDropzone.tsx#L6-L42","documentation":"Toast from the fullscreen Dropzone's onDrop async handler when reading the file contents throws. The handler awaits e[0].text() and then setContents; any failure in the read (or, because setContents is inside the try, a downstream store error) surfaces as this generic message. console.error(err) logs the real cause.","triggerScenarios":"The File.text() promise rejects (rare: file removed mid-read, permission revoked, device disconnect); setContents throws because contentToJson rejects the content for the detected format (e.g. malformed YAML/XML/CSV). The catch at FullscreenDropzone.tsx:24 covers both.","commonSituations":"Dropping a malformed YAML/CSV/XML file whose format was inferred from the extension but whose content fails conversion; dropping a 0-byte or unreadable file; browser storage/permission edge cases.","solutions":["Confirm the file is readable and non-empty before dropping.","Ensure the content matches the format implied by the extension.","Inspect the console (console.error logs the real error) to distinguish read vs conversion failure.","Narrow the try block so only the read is caught, surfacing conversion errors separately."],"exampleFix":"// before\ntry {\n  const fileContent = await e[0].text();\n  let fileExtension = e[0].name.split(\".\").pop() as FileFormat | undefined;\n  if (!fileExtension) fileExtension = FileFormat.JSON;\n  setContents({ contents: fileContent, format: fileExtension, hasChanges: false });\n} catch (err) {\n  toast.error(\"An error occurred while reading the file.\");\n  console.error(err);\n}\n\n// after — separate read from conversion errors\nlet fileContent;\ntry {\n  fileContent = await e[0].text();\n} catch (err) {\n  console.error(err);\n  toast.error(\"An error occurred while reading the file.\");\n  return;\n}\nconst fileExtension = (e[0].name.split(\".\").pop() as FileFormat) ?? FileFormat.JSON;\nsetContents({ contents: fileContent, format: fileExtension, hasChanges: false });","handlingStrategy":"try-catch","validationCode":"// Pre-check the file is readable and non-empty\nexport async function isReadableFile(file: File): Promise<boolean> {\n  if (file.size === 0) return false;\n  try { await file.slice(0, 1).text(); return true; } catch { return false; }\n}","typeGuard":"// Confirm File.text() produced a string\nexport function isTextResult(v: unknown): v is string {\n  return typeof v === \"string\";\n}","tryCatchPattern":"// Separate file-read from format-conversion failures\nlet content: string;\ntry { content = await file.text(); }\ncatch (err) { console.error(err); toast.error(\"An error occurred while reading the file.\"); return; }\ntry { setContents({ contents: content, format, hasChanges: false }); }\ncatch { toast.error(\"Could not import this format.\"); }","preventionTips":["Ensure the file content matches the extension-implied format.","Inspect the console (console.error logs the real cause).","Narrow the try block so read and conversion errors aren't conflated."],"tags":["file-upload","dropzone","io","import"],"backgroundTag":null,"analyzedSha":"3c9af69e23c635356293b6b28cf4cd0af10d1059","analyzedAt":"2026-08-12T19:00:27.891Z","schemaVersion":2},"datasetVersion":"2026-08-12T23:17:12.415Z"}