#3

frontend/package-lock.json

@@ -11,10 +11,12 @@
         "axios": "^1.10.0",
         "camelcase-keys": "^9.1.3",
         "classnames": "^2.5.1",
+        "konva": "^9.3.22",
         "react": "^19.1.0",
         "react-accessible-accordion": "^5.0.1",
         "react-dom": "^19.1.0",
         "react-icons": "^5.5.0",
+        "react-konva": "^19.0.7",
         "react-router-dom": "^7.7.0"
       },
       "devDependencies": {
@@ -1477,6 +1479,15 @@
         "@types/react": "^19.0.0"
       }
     },
+    "node_modules/@types/react-reconciler": {
+      "version": "0.32.0",
+      "resolved": "https://registry.npmjs.org/@types/react-reconciler/-/react-reconciler-0.32.0.tgz",
+      "integrity": "sha512-+WHarFkJevhH1s655qeeSEf/yxFST0dVRsmSqUgxG8mMOKqycgYBv2wVpyubBY7MX8KiX5FQ03rNIwrxfm7Bmw==",
+      "license": "MIT",
+      "peerDependencies": {
+        "@types/react": "*"
+      }
+    },
     "node_modules/@typescript-eslint/eslint-plugin": {
       "version": "8.37.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.37.0.tgz",
@@ -3141,6 +3152,27 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/its-fine": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/its-fine/-/its-fine-2.0.0.tgz",
+      "integrity": "sha512-KLViCmWx94zOvpLwSlsx6yOCeMhZYaxrJV87Po5k/FoZzcPSahvK5qJ7fYhS61sZi5ikmh2S3Hz55A2l3U69ng==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/react-reconciler": "^0.28.9"
+      },
+      "peerDependencies": {
+        "react": "^19.0.0"
+      }
+    },
+    "node_modules/its-fine/node_modules/@types/react-reconciler": {
+      "version": "0.28.9",
+      "resolved": "https://registry.npmjs.org/@types/react-reconciler/-/react-reconciler-0.28.9.tgz",
+      "integrity": "sha512-HHM3nxyUZ3zAylX8ZEyrDNd2XZOnQ0D5XfunJF5FLQnZbHHYq4UWvW1QfelQNXv1ICNkwYhfxjwfnqivYB6bFg==",
+      "license": "MIT",
+      "peerDependencies": {
+        "@types/react": "*"
+      }
+    },
     "node_modules/jackspeak": {
       "version": "3.4.3",
       "resolved": "https://registry.npmjs.org/jackspeak/-/jackspeak-3.4.3.tgz",
@@ -3244,6 +3276,26 @@
         "json-buffer": "3.0.1"
       }
     },
+    "node_modules/konva": {
+      "version": "9.3.22",
+      "resolved": "https://registry.npmjs.org/konva/-/konva-9.3.22.tgz",
+      "integrity": "sha512-yQI5d1bmELlD/fowuyfOp9ff+oamg26WOCkyqUyc+nczD/lhRa3EvD2MZOoc4c1293TAubW9n34fSQLgSeEgSw==",
+      "funding": [
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/lavrton"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/konva"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/lavrton"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/levn": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
@@ -3902,6 +3954,52 @@
         "react": "*"
       }
     },
+    "node_modules/react-konva": {
+      "version": "19.0.7",
+      "resolved": "https://registry.npmjs.org/react-konva/-/react-konva-19.0.7.tgz",
+      "integrity": "sha512-uYWCpSv4ajLymTh8S8fV9396fHDX7eDTWiLGkYlBuawud5MoNiuGjapPhA5Avdy/Jfh9P2KaWuNf4i9PI1F9HQ==",
+      "funding": [
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/lavrton"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/konva"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/lavrton"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@types/react-reconciler": "^0.32.0",
+        "its-fine": "^2.0.0",
+        "react-reconciler": "0.32.0",
+        "scheduler": "0.26.0"
+      },
+      "peerDependencies": {
+        "konva": "^8.0.1 || ^7.2.5 || ^9.0.0",
+        "react": "^18.3.1 || ^19.0.0",
+        "react-dom": "^18.3.1 || ^19.0.0"
+      }
+    },
+    "node_modules/react-reconciler": {
+      "version": "0.32.0",
+      "resolved": "https://registry.npmjs.org/react-reconciler/-/react-reconciler-0.32.0.tgz",
+      "integrity": "sha512-2NPMOzgTlG0ZWdIf3qG+dcbLSoAc/uLfOwckc3ofy5sSK0pLJqnQLpUFxvGcN2rlXSjnVtGeeFLNimCQEj5gOQ==",
+      "license": "MIT",
+      "dependencies": {
+        "scheduler": "^0.26.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      },
+      "peerDependencies": {
+        "react": "^19.1.0"
+      }
+    },
     "node_modules/react-refresh": {
       "version": "0.17.0",
       "resolved": "https://registry.npmjs.org/react-refresh/-/react-refresh-0.17.0.tgz",

frontend/package.json

@@ -13,10 +13,12 @@
     "axios": "^1.10.0",
     "camelcase-keys": "^9.1.3",
     "classnames": "^2.5.1",
+    "konva": "^9.3.22",
     "react": "^19.1.0",
     "react-accessible-accordion": "^5.0.1",
     "react-dom": "^19.1.0",
     "react-icons": "^5.5.0",
+    "react-konva": "^19.0.7",
     "react-router-dom": "^7.7.0"
   },
   "devDependencies": {

frontend/src/App.tsx

@@ -1,6 +1,11 @@
 import cn from 'classnames'
-import { useEffect, useState } from 'react'
-import { BrowserRouter, Link, Routes, Route, Navigate } from 'react-router-dom'
+import { useEffect, useRef, useState } from 'react'
+import { BrowserRouter,
+	 Link,
+	 Navigate,
+	 Route,
+	 Routes,
+	 useLocation } from 'react-router-dom'
 
 import bgmSrc from '@/assets/music.mp3'
 import ThreadListPage from '@/pages/threads/ThreadListPage'
@@ -18,13 +23,16 @@ const colours = ['bg-fuchsia-500 dark:bg-fuchsia-900',
 
 
 export default () => {
-  const [bgm] = useState (new Audio (bgmSrc))
+  const bgmRef = useRef<HTMLAudioElement | null> (null)
+
   const [colourIndex, setColourIndex] = useState (0)
   const [mute, setMute] = useState (false)
   const [playing, setPlaying] = useState (false)
 
   useEffect (() => {
-    bgm.loop = true
+    bgmRef.current = new Audio (bgmSrc)
+    bgmRef.current.loop = true
+    bgmRef.current.volume = 1
 
     const playBGM = async () => {
       if (playing)
@@ -32,9 +40,7 @@ export default () => {
 
       try
       {
-	await bgm.play ()
-	bgm.loop = true
-
+	await bgmRef.current.play ()
 	setPlaying (true)
       }
       catch
@@ -64,7 +70,7 @@ export default () => {
 	<div className={cn ('w-screen min-h-screen',
 			    colours[colourIndex],
 			    'transition-colors duration-[3s] ease-linear')}>
-	  <div className="mx-auto max-w-[960px]">
+	  <div className="mx-auto max-w-[960px] px-4">
 	    <header className="pt-6 mb-8">
 	      <h1 className="text-center">
 		<Link to="/"
@@ -80,7 +86,7 @@ export default () => {
 		{playing && (
 		    <a href="#" onClick={ev => {
 		      ev.preventDefault ()
-		      setMute (bgm.muted = !(mute))
+		      setMute (bgmRef.current.muted = !(mute))
 		    }}>
 		      {mute ? 'やっぱり BGM が恋しい人用' : 'BGM がうるさい人用'}
 		    </a>)}
@@ -88,6 +94,12 @@ export default () => {
 	    </header>
 	    <main className="mb-8">
 	      <Routes>
+		{() => {
+		  const { pathname } = useLocation ()
+		  useEffect (() => {
+		    scrollTo (0, 0)
+		  }, [pathname])
+	        }}
 		<Route path="/" element={<Navigate to="/threads" replace />} />
 		<Route path="/threads" element={<ThreadListPage />} />
 		<Route path="/threads/:id" element={<ThreadDetailPage />} />

frontend/src/components/threads/ThreadCanvas.tsx

@@ -0,0 +1,387 @@
+import { nanoid } from 'nanoid'
+import { useEffect, useRef, useState } from 'react'
+import { FaRedo, FaUndo } from 'react-icons/fa'
+import { Layer, Line, Rect, Stage, Image } from 'react-konva'
+
+import type { KonvaEventObject } from 'konva'
+import type { ChangeEventHandler } from 'react'
+
+type ImageItem = { src: string }
+
+type Layer = {
+    id:       string
+    name:     string
+    lines:    Line[]
+    history:  Line[][]
+    future:   Line[][]
+    image?:   ImageItem }
+
+type Line = {
+    mode:         Mode
+    points:       number[]
+    stroke:       string
+    strokeWidth:  number }
+
+const Mode = {
+    Pen:    Symbol (),
+    Rubber: Symbol (),
+    Image:  Symbol () } as const
+type Mode = keyof Mode
+
+
+export default () => {
+  const drawingRef = useRef (false)
+  const fileInputRef = useRef<HTMLInputElement> (null)
+  const stageRef = useRef<Stage | null> (null)
+
+  const [activeLayerId, setActiveLayerId] = useState<string | null> (null)
+  const [colour, setColour] = useState ('#000000')
+  const [images, setImages] = useState<Record<string, window.Image[]>> ({ })
+  const [layers, setLayers] = useState<Layer[]> ([])
+  const [layerCnt, setLayerCnt] = useState (0)
+  const [mode, setMode] = useState<Mode> (Mode.Pen)
+  const [pointSize, setPointSize] = useState (3)
+  const [stageWidth, setStageWidth] = useState (480)
+  const [stageHeight, setStageHeight] = useState (480)
+
+  const activeLayer = layers.find (l => l.id === activeLayerId)
+
+  const handleMouseDown = (ev: KonvaEventObject<MouseEvent>) => {
+    drawingRef.current = true
+    const pos = ev.target.getStage ()?.getPointerPosition ()
+    if (!(pos))
+      return
+    const lines: Line[] = [
+	...activeLayer.lines,
+	{ mode,
+	  points:      [pos.x, pos.y],
+	  stroke:      colour,
+	  strokeWidth: pointSize }]
+    updateActiveLayerLines (lines)
+  }
+
+  const handleMouseMove = (ev: KonvaEventObject<MouseEvent>) => {
+    if (!(drawingRef.current))
+      return
+    const stage = ev.target.getStage ()
+    const point = stage?.getPointerPosition ()
+    if (!(point))
+      return
+
+    const lastLine = activeLayer.lines[activeLayer.lines.length - 1]
+    const updatedLine = { ...lastLine,
+			  points: [...lastLine.points, point.x, point.y] }
+    const newLines = [...activeLayer.lines.slice (0, -1), updatedLine]
+    updateActiveLayerLines (newLines)
+  }
+
+  const handleMouseUp = () => {
+    drawingRef.current = false
+  }
+
+  const handleUndo = () => {
+    if (activeLayer.lines.length === 0)
+      return
+    const newLines = [...activeLayer.lines]
+    const last = newLines.pop()!
+    updateActiveLayerHistory ([...activeLayer.history, activeLayer.lines])
+    updateActiveLayerFuture ([])
+    updateActiveLayerLines (newLines)
+  }
+
+  const handleRedo = () => {
+    if (activeLayer.history.length === 0)
+      return
+    const prev = activeLayer.history[activeLayer.history.length - 1]
+    updateActiveLayerLines (prev)
+    updateActiveLayerHistory (activeLayer.history.slice (0, -1))
+  }
+
+  const handleImportImage: ChangeEventHandler<HTMLInputElement> = ev => {
+    const file = ev.target.files?.[0]
+    if (!(file))
+      return
+
+    const reader = new FileReader ()
+    reader.onload = () => {
+      const src = reader.result?.toString ()
+      if (!(src))
+	return
+      addLayer ({ src })
+    }
+    reader.readAsDataURL (file)
+
+    if (fileInputRef.current)
+      fileInputRef.current.value = ''
+  }
+
+  const updateActiveLayerLines = (lines: Line[]) => {
+    setLayers (prev => (
+	prev.map (layer => (layer.id === activeLayerId
+			    ? { ...layer, lines }
+			    : layer))))
+  }
+
+  const updateActiveLayerHistory = (history: Line[][]) => {
+    setLayers (prev => (
+	prev.map (layer => (layer.id === activeLayerId
+			    ? { ...layer, history }
+			    : layer))))
+  }
+
+  const updateActiveLayerFuture = (future: Line[][]) => {
+    setLayers (prev => (
+	prev.map (layer => (layer.id === activeLayerId
+			    ? { ...layer, future }
+			    : layer))))
+  }
+
+  const addLayer = (image?: ImageItem) => {
+    const layer: Layer = { id:      nanoid (),
+			   name:    `Layer ${ layerCnt + 1 }`,
+			   lines:   [],
+			   history: [],
+			   future:  [],
+			   image }
+    setLayers(prev => [...prev, layer])
+    setActiveLayerId (layer.id)
+    setLayerCnt (n => n + 1)
+
+    return layer
+  }
+
+  const moveLayer = (direction: number) => {
+    setLayers(prev => {
+      const idx = prev.findIndex (l => l.id === activeLayerId)
+      if (idx < 0)
+	return prev
+      const target = idx + direction
+      if (target < 0 || target >= prev.length)
+	return prev
+      const next = [...prev]
+      const [item] = next.splice(idx, 1)
+      next.splice(target, 0, item)
+      return next
+    })
+  }
+
+  useEffect (() => {
+    try
+    {
+      const paint = JSON.parse (localStorage.getItem ('paint'))
+      if (!(paint instanceof Array))
+	throw new Error
+      setLayers (paint)
+      setActiveLayerId (paint[0].id)
+    }
+    catch
+    {
+      const layer: Layer = { id:      nanoid (),
+			     name:    `Layer ${ layerCnt + 1 }`,
+			     lines:   [],
+			     history: [],
+			     future:  [] }
+      setLayers([layer])
+      setActiveLayerId (layer.id)
+      setLayerCnt (n => n + 1)
+    }
+  }, [])
+
+  useEffect (() => {
+    localStorage.setItem ('paint', JSON.stringify (layers))
+
+    layers.forEach (layer => {
+      if (layer.image && !(layer.id in images))
+	{
+	  const image = new window.Image
+	  image.src = layer.image.src
+	  image.onload = () => {
+	    setImages (prev => ({ ...prev, [layer.id]: image }))
+	  }
+	}
+    })
+  }, [layers])
+
+  return (
+      <div>
+	<div>
+	  <div>
+	    <button onClick={() => {
+	      if (!(confirm ('作成中の絵を消してもよろしいですか?')))
+		return
+
+	      setLayers (layers.map (layer => ({
+		  ...layer,
+		  lines:    [],
+		  hishory:  [],
+		  future:   [] })))
+	    }}>
+	      初期化
+	    </button>
+
+	    <button onClick={() => fileInputRef.current?.click ()}>
+	      画像
+	    </button>
+	    <input ref={fileInputRef}
+		   type="file"
+		   accept="image/*"
+		   className="hidden"
+		   onChange={handleImportImage} />
+
+	    <button onClick={() => {
+	      const stage = stageRef.current
+	      if (!(stage))
+		return
+	      const mimeType = 'image/png'
+	      const dataURL = stage.toDataURL ({ mimeType, pixelRatio: 2 })
+
+	      const $a = document.createElement ('a')
+	      $a.href = dataURL
+	      $a.download = `kekec-bbs_${ (new Date).toLocaleString ('ja-JP-u-ca-japanese').replaceAll (/[\/:]/g, '-').replaceAll (/\s/g, '_') }.png`
+	      document.body.appendChild ($a)
+	      $a.click ()
+	      $a.remove ()
+	    }}>
+	      保存
+	    </button>
+	  </div>
+
+	  <div>
+	    <label>モード：</label>
+	    <label>
+	      <input type="radio"
+		     name="mode"
+		     value="pen"
+		     checked={mode === Mode.Pen}
+		     onChange={() => setMode (Mode.Pen)} />
+	      ペン
+	    </label>
+	    <label>
+	      <input type="radio"
+		     name="mode"
+		     value="rubber"
+		     checked={mode === Mode.Rubber}
+		     onChange={() => setMode (Mode.Rubber)} />
+	      消しゴム
+	    </label>
+	  </div>
+
+	  <div>
+	    <button onClick={handleUndo} disabled={activeLayer?.lines.length === 0}>
+	      <FaUndo />
+	    </button>
+	    <button onClick={handleRedo} disabled={activeLayer?.history.length === 0}>
+	      <FaRedo />
+	    </button>
+	  </div>
+
+	  <div>
+	    <label>色：</label>
+	    <input type="color"
+		   value={colour}
+		   onChange={ev => setColour (ev.target.value)} />
+	  </div>
+
+	  <div>
+	    <label>サイズ：</label>
+	    <input type="range"
+		   min={1}
+		   max={57}
+		   value={pointSize}
+		   onChange={ev => setPointSize (+ev.target.value)} />
+	    {pointSize}
+	  </div>
+
+	  <div>
+	    <label>レイア：</label>
+	    {layers.map (layer => (
+		<label key={layer.id}>
+		  <input type="radio"
+			 name="layer"
+			 value={layer.id}
+			 checked={layer.id === activeLayerId}
+			 onChange={() => setActiveLayerId (layer.id)} />
+		  {layer.name}
+		</label>))}
+	    <button onClick={() => {
+	      if (layers.length === 1)
+		{
+		  alert ('何を消そうというのだ．')
+		  return
+		}
+
+	      if (!(confirm ('選択中のレイアを削除するがよろしいか?')))
+		return
+
+	      let idx = layers.findIndex (l => l.id === activeLayerId) - 1
+	      if (idx < 0)
+		idx = 0
+	      const newLayers = layers.filter (l => l.id !== activeLayerId)
+	      setActiveLayerId (newLayers[idx].id)
+	      setLayers (newLayers)
+	    }}>
+	      削除
+	    </button>
+	    <button onClick={() => {
+	      moveLayer (-1)
+	    }}>
+	      下へ
+	    </button>
+	    <button onClick={() => {
+	      moveLayer (1)
+	    }}>
+	      上へ
+	    </button>
+	    <button onClick={() => addLayer ()}>
+	      追加
+	    </button>
+	  </div>
+	</div>
+
+	<div className="w-full flex items-center justify-center mb-16">
+	  <div className="border border-black dark:border-white">
+	    <Stage ref={node => {
+		     stageRef.current = node
+		     return node
+		   }}
+		   width={stageWidth}
+		   height={stageHeight}
+		   onMouseDown={handleMouseDown}
+		   onMouseMove={handleMouseMove}
+		   onMouseUp={handleMouseUp}
+		   onTouchStart={handleMouseDown}
+		   onTouchMove={handleMouseMove}
+		   onTouchEnd={handleMouseUp}>
+	      <Layer>
+		<Rect x={0}
+		      y={0}
+		      width={stageWidth}
+		      height={stageHeight}
+		      fill="white" />
+	      </Layer>
+
+	      {layers.map (layer => (
+		  <Layer key={layer.id}>
+		    {images[layer.id] && (
+			<Image image={images[layer.id]}
+			       x={0}
+			       y={0}
+			       scaleX={stageWidth / images[layer.id].width}
+			       scaleY={stageHeight / images[layer.id].height} />)}
+
+		    {layer.lines.map ((line, i) => (
+			<Line key={i}
+			      points={line.points}
+			      stroke={line.mode === Mode.Rubber ? 'black' : line.stroke}
+			      strokeWidth={line.strokeWidth}
+			      tension={.5}
+			      lineCap="round"
+			      globalCompositeOperation={line.mode === Mode.Rubber
+							? 'destination-out'
+							: 'source-over'} />))}
+		  </Layer>))}
+	    </Stage>
+	  </div>
+	</div>
+      </div>)
+}

frontend/src/pages/threads/ThreadDetailPage.tsx

@@ -4,6 +4,7 @@ import { useEffect, useState } from 'react'
 import { FaThumbsDown, FaThumbsUp } from 'react-icons/fa'
 import { useParams } from 'react-router-dom'
 
+import ThreadCanvas from '@/components/threads/ThreadCanvas'
 import { API_BASE_URL } from '@/config'
 
 
@@ -12,8 +13,21 @@ export default () => {
 
   const [loading, setLoading] = useState (true)
   const [posts, setPosts] = useState<Post[]> ([])
+  const [thread, setThread] = useState<Thread | null> (null)
 
   useEffect (() => {
+    const fetchThread = async () => {
+      try
+      {
+	const res = await axios.get (`${ API_BASE_URL }/threads/${ id }`)
+	setThread (toCamel (res.data as any, { deep: true }) as Thread)
+      }
+      catch
+      {
+	setThread (null)
+      }
+    }
+
     const fetchPosts = async () => {
       setLoading (true)
       try
@@ -26,21 +40,29 @@ export default () => {
       }
       catch
       {
-	;
+	setPosts ([])
       }
       setLoading (false)
     }
 
-    setPosts ([])
+    fetchThread ()
     fetchPosts ()
   }, [])
 
+  useEffect (() => {
+    if (!(thread))
+      return
+    document.title = `${ thread.name } - キケッツチャンネル お絵描き掲示板`
+  }, [thread])
+
   return (
       <>
+	<ThreadCanvas />
 	{loading ? 'Loading...' : (
 	    posts.length > 0
 	    ? posts.map (post => (
-		<div className="bg-white dark:bg-gray-800 p-3 m-4
+		<div key={post.id}
+		     className="bg-white dark:bg-gray-800 p-3 m-4
 				border border-gray-400 rounded-xl
 				text-center">
 		  <div className="flex justify-between items-center px-2 py-1">
@@ -55,7 +77,7 @@ export default () => {
 			 try
 			 {
 			   await axios.post (`${ API_BASE_URL }/posts/${ post.id }/bad`)
-			   setPosts (prev => prev.map (p => (p.id == post.id
+			   setPosts (prev => prev.map (p => (p.id === post.id
 							     ? { ...p, bad: p.bad + 1 }
 							     : p)))
 			 }
@@ -83,7 +105,7 @@ export default () => {
 			 try
 			 {
 			   await axios.post (`${ API_BASE_URL }/posts/${ post.id }/good`)
-			   setPosts (prev => prev.map (p => (p.id == post.id
+			   setPosts (prev => prev.map (p => (p.id === post.id
 							     ? { ...p, good: p.good + 1 }
 							     : p)))
 			 }
@@ -95,7 +117,7 @@ export default () => {
 		      {post.good} <FaThumbsUp className="inline" />
 		    </a>
 		  </div>
-		  <div className="bg-white inline-block">
+		  <div className="bg-white inline-block border border-black dark:border-white">
 		    <img src={`${ API_BASE_URL }${ post.imageUrl }`} />
 		  </div>
 		</div>))

frontend/src/pages/threads/ThreadListPage.tsx

@@ -41,6 +41,7 @@ export default () => {
   }
 
   useEffect (() => {
+    document.title = 'キケッツチャンネル お絵描き掲示板'
     fetchThreads ()
   }, [])
 
@@ -66,7 +67,8 @@ export default () => {
 	  {loading ? 'Loading...' : (
 	      threads.length > 0
 	      ? threads.map (thread => (
-		  <div className="bg-white dark:bg-gray-800 p-3 m-4
+		  <div key={thread.id}
+		       className="bg-white dark:bg-gray-800 p-3 m-4
 				  border border-gray-400 rounded-xl">
 		    <div>
 		      <Link to={`/threads/${ thread.id }`}>
@@ -76,7 +78,7 @@ export default () => {
 			{thread.description?.replaceAll ('\r\n', '\n')
 					    .replaceAll ('\r', '\n')
 					    .split ('\n')
-					    .map (l => <p>{l}</p>)}
+					    .map ((l, i) => <p key={i}>{l}</p>)}
 		      </div>
 		    </div>
 		    <div className="grid grid-cols-3 justify-between text-sm