diff --git a/package-lock.json b/package-lock.json
index fd0aa3c3..f18f6576 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,6 +16,7 @@
         "@mcschema/java-1.18": "^0.2.15",
         "@mcschema/java-1.18.2": "npm:@mcschema/java-1.18@^0.3.0-beta.5",
         "@mcschema/locales": "^0.1.45",
+        "brace": "^0.11.1",
         "buffer": "^6.0.3",
         "comment-json": "^4.1.1",
         "deepslate": "^0.9.0-beta.9",
@@ -1088,6 +1089,11 @@
       "integrity": "sha512-XpNj6GDQzdfW+r2Wnn7xiSAd7TM3jzkxGXBGTtWKuSXv1xUV+azxAm8jdWZN06QTQk+2N2XB9jRDkvbmQmcRtg==",
       "dev": true
     },
+    "node_modules/brace": {
+      "version": "0.11.1",
+      "resolved": "https://registry.npmjs.org/brace/-/brace-0.11.1.tgz",
+      "integrity": "sha1-SJb8ydVE7vRfS7dmDbMg07N5/lg="
+    },
     "node_modules/brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -5218,6 +5224,11 @@
       "integrity": "sha512-XpNj6GDQzdfW+r2Wnn7xiSAd7TM3jzkxGXBGTtWKuSXv1xUV+azxAm8jdWZN06QTQk+2N2XB9jRDkvbmQmcRtg==",
       "dev": true
     },
+    "brace": {
+      "version": "0.11.1",
+      "resolved": "https://registry.npmjs.org/brace/-/brace-0.11.1.tgz",
+      "integrity": "sha1-SJb8ydVE7vRfS7dmDbMg07N5/lg="
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
diff --git a/package.json b/package.json
index 22316aa8..6b67d9ca 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
     "@mcschema/java-1.18": "^0.2.15",
     "@mcschema/java-1.18.2": "npm:@mcschema/java-1.18@^0.3.0-beta.5",
     "@mcschema/locales": "^0.1.45",
+    "brace": "^0.11.1",
     "buffer": "^6.0.3",
     "comment-json": "^4.1.1",
     "deepslate": "^0.9.0-beta.9",
diff --git a/src/app/components/generator/SourcePanel.tsx b/src/app/components/generator/SourcePanel.tsx
index 8b946cea..4293dc38 100644
--- a/src/app/components/generator/SourcePanel.tsx
+++ b/src/app/components/generator/SourcePanel.tsx
@@ -1,4 +1,7 @@
 import { DataModel } from '@mcschema/core'
+import brace from 'brace'
+import 'brace/mode/json'
+import 'brace/mode/yaml'
 import json from 'comment-json'
 import yaml from 'js-yaml'
 import { useCallback, useEffect, useRef, useState } from 'preact/hooks'
@@ -10,8 +13,6 @@ import type { BlockStateRegistry } from '../../services'
 import { Store } from '../../Store'
 import { message } from '../../Utils'
 
-const OUTPUT_CHARS_LIMIT = 10000
-
 const INDENT: Record<string, number | string | undefined> = {
 	'2_spaces': 2,
 	'4_spaces': 4,
@@ -50,9 +51,11 @@ export function SourcePanel({ name, model, blockStates, doCopy, doDownload, doIm
 	const { locale } = useLocale()
 	const [indent, setIndent] = useState(Store.getIndent())
 	const [format, setFormat] = useState(Store.getFormat())
-	const source = useRef<HTMLTextAreaElement>(null)
 	const download = useRef<HTMLAnchorElement>(null)
 	const retransform = useRef<Function>()
+	const onImport = useRef<(e: any) => any>()
+
+	const editor = useRef<brace.Editor>()
 
 	const getSerializedOutput = useCallback((model: DataModel, blockStates: BlockStateRegistry) => {
 		const data = getOutput(model, blockStates)
@@ -64,18 +67,38 @@ export function SourcePanel({ name, model, blockStates, doCopy, doDownload, doIm
 			if (!model || !blockStates) return
 			try {
 				const output = getSerializedOutput(model, blockStates)
-				if (output.length >= OUTPUT_CHARS_LIMIT) {
-					source.current.value = output.slice(0, OUTPUT_CHARS_LIMIT) + `\n\nOutput is too large to display (+${OUTPUT_CHARS_LIMIT} chars)\nExport to view complete output\n\n`
-				} else {
-					source.current.value = output
-				}
+				editor.current.getSession().setValue(output)
 			} catch (e) {
 				onError(`Error getting JSON output: ${message(e)}`)
 				console.error(e)
-				source.current.value = ''
+				editor.current.setValue('')
 			}
 		}
-	})
+
+		onImport.current = () => {
+			const value = editor.current.getValue()
+			if (value.length === 0) return
+			try {
+				const data = FORMATS[format].parse(value)
+				model?.reset(DataModel.wrapLists(data), false)
+			} catch (e) {
+				onError(`Error importing: ${message(e)}`)
+				console.error(e)
+			}
+		}
+	}, [model, blockStates, indent, format])
+
+	useEffect(() => {
+		editor.current = brace.edit('editor')
+		editor.current.setOptions({
+			fontSize: 14,
+			showFoldWidgets: false,
+			highlightSelectedWord: false,
+		})
+		editor.current.$blockScrolling = Infinity
+		editor.current.on('blur', e => onImport.current(e))
+		editor.current.getSession().setMode('ace/mode/json')
+	}, [])
 
 	useModel(model, () => {
 		retransform.current()
@@ -85,20 +108,12 @@ export function SourcePanel({ name, model, blockStates, doCopy, doDownload, doIm
 	}, [model])
 
 	useEffect(() => {
+		const softTabs = indent === 'tabs' ? false : INDENT[indent]
+		editor.current.setOption('useSoftTabs', softTabs)
+		editor.current.getSession().setMode(`ace/mode/${format}`)
 		retransform.current()
 	}, [indent, format])
 
-	const onImport = () => {
-		if (source.current.value.length === 0) return
-		try {
-			const data = FORMATS[format].parse(source.current.value)
-			model?.reset(DataModel.wrapLists(data), false)
-		} catch (e) {
-			onError(`Error importing: ${message(e)}`)
-			console.error(e)
-		}
-	}
-
 	useEffect(() => {
 		if (doCopy && model && blockStates) {
 			navigator.clipboard.writeText(getSerializedOutput(model, blockStates)).then(() => {
@@ -117,9 +132,9 @@ export function SourcePanel({ name, model, blockStates, doCopy, doDownload, doIm
 	}, [doDownload])
 
 	useEffect(() => {
-		if (doImport && source.current) {
-			source.current.value = ''
-			source.current.select()
+		if (doImport && editor.current) {
+			editor.current.setValue('')
+			editor.current.selectAll()
 		}
 	}, [doImport])
 
@@ -134,7 +149,7 @@ export function SourcePanel({ name, model, blockStates, doCopy, doDownload, doIm
 	}
 
 	return <> 
-		<div class="controls">
+		<div class="controls source-controls">
 			<BtnMenu icon="gear" tooltip={locale('output_settings')} data-cy="source-controls">
 				{Object.entries(INDENT).map(([key]) =>
 					<Btn label={locale(`indentation.${key}`)} active={indent === key}
@@ -146,7 +161,7 @@ export function SourcePanel({ name, model, blockStates, doCopy, doDownload, doIm
 						onClick={() => changeFormat(key)} />)}
 			</BtnMenu>
 		</div>
-		<textarea ref={source} class="source" onBlur={onImport} spellcheck={false} autocorrect="off" placeholder={locale('source_placeholder', format.toUpperCase())} data-cy="import-area"></textarea>
+		<pre id="editor" class="source"></pre>
 		<a ref={download} style="display: none;"></a>
 	</>
 }
diff --git a/src/styles/global.css b/src/styles/global.css
index c5cba983..f01cb710 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -20,12 +20,16 @@
 	--nav-hover: #b4b3b0;
 	--nav-faded: #4d4c4c;
 	--nav-faded-hover: #6e6e6e;
-	--selection: #6786dd99;
+	--selection: #445a9599;
 	--errors-background: #62190f;
 	--errors-text: #ffffffcc;
   --invalid-text: #fd7951;
 	--text-saturation: 60%;
 	--text-lightness: 45%;
+	--editor-variable: #9CDCFE;
+	--editor-string: #CE9178;
+	--editor-constant: #569CD6;
+	--editor-number: #B5CEA8;
 }
 
 :root[data-theme=light] {
@@ -56,6 +60,10 @@
   --invalid-text: #a32600;
 	--text-saturation: 100%;
 	--text-lightness: 30%;
+	--editor-variable: #0451A5;
+	--editor-string: #A31515;
+	--editor-constant: #0000FF;
+	--editor-number: #098658;
 }
 
 @media (prefers-color-scheme: light) {
@@ -307,6 +315,7 @@ main > .controls {
 
 .source-controls {
 	justify-content: flex-end;
+	z-index: 10;
 }
 
 .tree {
@@ -1249,6 +1258,49 @@ hr {
 	margin: 8px 0 0;
 }
 
+.ace_editor,
+.ace_gutter,
+.ace_gutter .ace_layer,
+.ace_content {
+	color: var(--text-2) !important;
+	background-color: var(--background-2) !important;
+	border: none;
+}
+
+.ace_cursor {
+	color: var(--text-1) !important;
+}
+
+.ace_gutter-active-line {
+	background-color: var(--background-3) !important;
+}
+
+.ace_tag,
+.ace_variable {
+	color: var(--editor-variable) !important;
+}
+
+.ace_string {
+	color: var(--editor-string) !important;
+}
+
+.ace_constant {
+	color: var(--editor-constant) !important;
+}
+
+.ace_numeric {
+	color: var(--editor-number) !important;
+}
+
+.ace_markup,
+.ace_keyword {
+	color: unset !important;
+}
+
+.ace_marker-layer .ace_selection {
+	background-color: var(--selection) !important;
+}
+
 @media screen and (max-width: 720px) {
 	.sound-search-group {
 		margin-bottom: 8px;