diff --git a/package-lock.json b/package-lock.json
index 3117a68888..edabe369d6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -44,6 +44,7 @@
         "lz-string": "^1.4.4",
         "mangrove-reviews-typescript": "^1.1.0",
         "maplibre-gl": "^3.5.0",
+        "monaco-editor": "^0.46.0",
         "nano-markdown": "^1.2.2",
         "opening_hours": "^3.6.0",
         "osm-auth": "^2.2.0",
@@ -68,6 +69,7 @@
         "@babeard/svelte-heroicons": "^2.0.0-rc.0",
         "@babel/polyfill": "^7.10.4",
         "@babel/preset-env": "7.13.8",
+        "@monaco-editor/loader": "^1.4.0",
         "@parcel/service-worker": "^2.6.0",
         "@rollup/plugin-json": "^6.0.0",
         "@sveltejs/vite-plugin-svelte": "^2.0.2",
@@ -2355,6 +2357,18 @@
         "gl-style-validate": "dist/gl-style-validate.mjs"
       }
     },
+    "node_modules/@monaco-editor/loader": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@monaco-editor/loader/-/loader-1.4.0.tgz",
+      "integrity": "sha512-00ioBig0x642hytVspPl7DbQyaSWRaolYie/UFNjoTdvoKPzo6xrXLhTk9ixgIKcLH5b5vDOjVNiGyY+uDCUlg==",
+      "dev": true,
+      "dependencies": {
+        "state-local": "^1.0.6"
+      },
+      "peerDependencies": {
+        "monaco-editor": ">= 0.21.0 < 1"
+      }
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -9377,6 +9391,11 @@
         "url": "https://github.com/chalk/supports-color?sponsor=1"
       }
     },
+    "node_modules/monaco-editor": {
+      "version": "0.46.0",
+      "resolved": "https://registry.npmjs.org/monaco-editor/-/monaco-editor-0.46.0.tgz",
+      "integrity": "sha512-ADwtLIIww+9FKybWscd7OCfm9odsFYHImBRI1v9AviGce55QY8raT+9ihH8jX/E/e6QVSGM+pKj4jSUSRmALNQ=="
+    },
     "node_modules/monotone-convex-hull-2d": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/monotone-convex-hull-2d/-/monotone-convex-hull-2d-1.0.1.tgz",
@@ -11499,6 +11518,12 @@
         "node": ">=0.1.14"
       }
     },
+    "node_modules/state-local": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/state-local/-/state-local-1.0.7.tgz",
+      "integrity": "sha512-HTEHMNieakEnoe33shBYcZ7NX83ACUjCu8c40iOGEZsngj9zRnkqS9j1pqQPXwobB0ZcVTk27REb7COQ0UR59w==",
+      "dev": true
+    },
     "node_modules/std-env": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/std-env/-/std-env-3.3.2.tgz",
@@ -15357,6 +15382,15 @@
         "sort-object": "^3.0.3"
       }
     },
+    "@monaco-editor/loader": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@monaco-editor/loader/-/loader-1.4.0.tgz",
+      "integrity": "sha512-00ioBig0x642hytVspPl7DbQyaSWRaolYie/UFNjoTdvoKPzo6xrXLhTk9ixgIKcLH5b5vDOjVNiGyY+uDCUlg==",
+      "dev": true,
+      "requires": {
+        "state-local": "^1.0.6"
+      }
+    },
     "@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -20688,6 +20722,11 @@
         }
       }
     },
+    "monaco-editor": {
+      "version": "0.46.0",
+      "resolved": "https://registry.npmjs.org/monaco-editor/-/monaco-editor-0.46.0.tgz",
+      "integrity": "sha512-ADwtLIIww+9FKybWscd7OCfm9odsFYHImBRI1v9AviGce55QY8raT+9ihH8jX/E/e6QVSGM+pKj4jSUSRmALNQ=="
+    },
     "monotone-convex-hull-2d": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/monotone-convex-hull-2d/-/monotone-convex-hull-2d-1.0.1.tgz",
@@ -22222,6 +22261,12 @@
       "integrity": "sha512-EeNzTVfj+1In7aSLPKDD03F/ly4RxEuF/EX0YcOG0cKoPXs+SLZxDawQbexQDBzwROs4VKLWTOaZQlZkGBFEIQ==",
       "optional": true
     },
+    "state-local": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/state-local/-/state-local-1.0.7.tgz",
+      "integrity": "sha512-HTEHMNieakEnoe33shBYcZ7NX83ACUjCu8c40iOGEZsngj9zRnkqS9j1pqQPXwobB0ZcVTk27REb7COQ0UR59w==",
+      "dev": true
+    },
     "std-env": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/std-env/-/std-env-3.3.2.tgz",
diff --git a/package.json b/package.json
index 207de57981..8eeef3fea6 100644
--- a/package.json
+++ b/package.json
@@ -143,6 +143,7 @@
     "lz-string": "^1.4.4",
     "mangrove-reviews-typescript": "^1.1.0",
     "maplibre-gl": "^3.5.0",
+    "monaco-editor": "^0.46.0",
     "nano-markdown": "^1.2.2",
     "opening_hours": "^3.6.0",
     "osm-auth": "^2.2.0",
@@ -167,6 +168,7 @@
     "@babeard/svelte-heroicons": "^2.0.0-rc.0",
     "@babel/polyfill": "^7.10.4",
     "@babel/preset-env": "7.13.8",
+    "@monaco-editor/loader": "^1.4.0",
     "@parcel/service-worker": "^2.6.0",
     "@rollup/plugin-json": "^6.0.0",
     "@sveltejs/vite-plugin-svelte": "^2.0.2",
diff --git a/public/css/index-tailwind-output.css b/public/css/index-tailwind-output.css
index 828557555f..81bf9ff94d 100644
--- a/public/css/index-tailwind-output.css
+++ b/public/css/index-tailwind-output.css
@@ -777,6 +777,10 @@ video {
   float: left;
 }
 
+.m-8 {
+  margin: 2rem;
+}
+
 .m-4 {
   margin: 1rem;
 }
@@ -789,10 +793,6 @@ video {
   margin: 0px;
 }
 
-.m-8 {
-  margin: 2rem;
-}
-
 .m-2 {
   margin: 0.5rem;
 }
@@ -896,6 +896,10 @@ video {
   margin-right: 4rem;
 }
 
+.mb-4 {
+  margin-bottom: 1rem;
+}
+
 .mt-4 {
   margin-top: 1rem;
 }
@@ -928,10 +932,6 @@ video {
   margin-right: 0.25rem;
 }
 
-.mb-4 {
-  margin-bottom: 1rem;
-}
-
 .ml-1 {
   margin-left: 0.25rem;
 }
@@ -1127,14 +1127,14 @@ video {
   height: 50%;
 }
 
-.h-7 {
-  height: 1.75rem;
-}
-
 .h-3 {
   height: 0.75rem;
 }
 
+.h-7 {
+  height: 1.75rem;
+}
+
 .h-11 {
   height: 2.75rem;
 }
@@ -1163,6 +1163,10 @@ video {
   height: 20rem;
 }
 
+.h-5\/6 {
+  height: 83.333333%;
+}
+
 .h-56 {
   height: 14rem;
 }
@@ -1233,14 +1237,14 @@ video {
   width: 1rem;
 }
 
-.w-7 {
-  width: 1.75rem;
-}
-
 .w-3 {
   width: 0.75rem;
 }
 
+.w-7 {
+  width: 1.75rem;
+}
+
 .w-11 {
   width: 2.75rem;
 }
@@ -1266,6 +1270,14 @@ video {
   width: 4rem;
 }
 
+.w-5\/6 {
+  width: 83.333333%;
+}
+
+.w-1\/6 {
+  width: 16.666667%;
+}
+
 .w-min {
   width: -webkit-min-content;
   width: min-content;
diff --git a/src/UI/Base/TabbedGroup.svelte b/src/UI/Base/TabbedGroup.svelte
index b3aeb531a1..1bef33d5d8 100644
--- a/src/UI/Base/TabbedGroup.svelte
+++ b/src/UI/Base/TabbedGroup.svelte
@@ -28,6 +28,9 @@
       window.setTimeout(() => tabElements[tab.data].click(), 50)
     }
   }
+  export function getTab() {
+    return tab
+  }
 </script>
 
 <div class="tabbedgroup flex h-full w-full">
diff --git a/src/UI/Studio/EditLayer.svelte b/src/UI/Studio/EditLayer.svelte
index e9c44a1f79..41c309e16f 100644
--- a/src/UI/Studio/EditLayer.svelte
+++ b/src/UI/Studio/EditLayer.svelte
@@ -13,14 +13,15 @@
   import SchemaBasedInput from "./SchemaBasedInput.svelte"
   import FloatOver from "../Base/FloatOver.svelte"
   import TagRenderingInput from "./TagRenderingInput.svelte"
-  import FromHtml from "../Base/FromHtml.svelte"
   import AllTagsPanel from "../Popup/AllTagsPanel.svelte"
   import QuestionPreview from "./QuestionPreview.svelte"
   import ShowConversionMessages from "./ShowConversionMessages.svelte"
+  import RawEditor from "./RawEditor.svelte"
 
   const layerSchema: ConfigMeta[] = <any>layerSchemaRaw
 
   export let state: EditLayerState
+
   export let backToStudio: () => void
   let messages = state.messages
   let hasErrors = messages.mapD(
@@ -59,7 +60,7 @@
   }
 
   let requiredFields = ["id", "name", "description", "source"]
-  let currentlyMissing = state.configuration.map((config) => {
+  let currentlyMissing = configuration.map((config) => {
     if (!config) {
       return []
     }
@@ -184,33 +185,34 @@
           <Region configs={perRegion["expert"]} {state} />
         </div>
         <div slot="title5">Configuration file</div>
-        <div slot="content5">
+        <div slot="content5" class="flex h-full flex-col">
           <div>
             Below, you'll find the raw configuration file in `.json`-format. This is mostly for
-            debugging purposes
+            debugging purposes, but you can also edit the file directly if you want.
           </div>
-          <div class="literal-code">
-            <FromHtml src={JSON.stringify($configuration, null, "  ").replaceAll("\n", "</br>")} />
-          </div>
-
           <ShowConversionMessages messages={$messages} />
-          <div>
-            The testobject (which is used to render the questions in the 'information panel' item
-            has the following tags:
-          </div>
+          <div class="flex h-full w-full flex-row justify-between overflow-y-auto">
+            <div class="literal-code h-full w-5/6 overflow-y-auto">
+              <RawEditor {state} />
+            </div>
+            <div class="h-full w-1/6">
+              <div>
+                The testobject (which is used to render the questions in the 'information panel'
+                item has the following tags:
+              </div>
 
-          <AllTagsPanel tags={state.testTags} />
+              <AllTagsPanel tags={state.testTags} />
+            </div>
+          </div>
         </div>
       </TabbedGroup>
     </div>
     {#if $highlightedItem !== undefined}
       <FloatOver on:close={() => highlightedItem.setData(undefined)}>
         <div>
-          <TagRenderingInput
-            path={$highlightedItem.path}
-            {state}
-            schema={$highlightedItem.schema}
-          />
+          <TagRenderingInput path={$highlightedItem.path} {state} />
+          <!-- 
+            schema={$highlightedItem.schema} -->
         </div>
       </FloatOver>
     {/if}
diff --git a/src/UI/Studio/EditTheme.svelte b/src/UI/Studio/EditTheme.svelte
index e985beee99..bd71c0134f 100644
--- a/src/UI/Studio/EditTheme.svelte
+++ b/src/UI/Studio/EditTheme.svelte
@@ -6,6 +6,7 @@
   import TabbedGroup from "../Base/TabbedGroup.svelte"
   import ShowConversionMessages from "./ShowConversionMessages.svelte"
   import Region from "./Region.svelte"
+  import RawEditor from "./RawEditor.svelte"
 
   export let state: EditThemeState
   let schema: ConfigMeta[] = state.schema.filter((schema) => schema.path.length > 0)
@@ -50,7 +51,7 @@
   </div>
 
   <div class="m4 h-full overflow-y-auto">
-    {Object.keys(perRegion).join(";")}
+    <!-- {Object.keys(perRegion).join(";")} -->
     <TabbedGroup>
       <div slot="title0">Basic properties</div>
       <div slot="content0">
@@ -73,12 +74,15 @@
       </div>
 
       <div slot="title4">Configuration file</div>
-      <div slot="content4">
-        <div class="literal-code">
-          {JSON.stringify($config)}
+      <div slot="content4" class="flex h-full flex-col">
+        <div>
+          Below, you'll find the raw configuration file in `.json`-format. This is mostly for
+          debugging purposes, but you can also edit the file directly if you want.
         </div>
-
         <ShowConversionMessages messages={$messages} />
+        <div class="literal-code h-full w-full">
+          <RawEditor {state} />
+        </div>
       </div>
     </TabbedGroup>
   </div>
diff --git a/src/UI/Studio/RawEditor.svelte b/src/UI/Studio/RawEditor.svelte
new file mode 100644
index 0000000000..679f2f3146
--- /dev/null
+++ b/src/UI/Studio/RawEditor.svelte
@@ -0,0 +1,101 @@
+<script lang="ts">
+  import { onDestroy, onMount } from "svelte"
+  import EditLayerState, { EditThemeState } from "./EditLayerState"
+  import loader from "@monaco-editor/loader"
+  import type * as Monaco from "monaco-editor/esm/vs/editor/editor.api"
+  import layerSchemaJSON from "../../../Docs/Schemas/LayerConfigJson.schema.json"
+  import layoutSchemaJSON from "../../../Docs/Schemas/LayoutConfigJson.schema.json"
+
+  export let state: EditLayerState | EditThemeState
+
+  let container: HTMLDivElement
+  let monaco: typeof Monaco
+  let editor: Monaco.editor.IStandaloneCodeEditor
+  let model: Monaco.editor.ITextModel
+
+  function save() {
+    try {
+      const newConfig = JSON.parse(editor.getValue())
+      state.configuration.setData(newConfig)
+    } catch (e) {
+      console.error(e)
+    }
+  }
+
+  // Catch keyboard shortcuts
+  onMount(() => {
+    const handler = (e: KeyboardEvent) => {
+      if (e.key === "s" && (e.ctrlKey || e.metaKey)) {
+        e.preventDefault()
+        save()
+      }
+    }
+    window.addEventListener("keydown", handler)
+    return () => window.removeEventListener("keydown", handler)
+  })
+
+  onMount(async () => {
+    const monacoEditor = await import("monaco-editor")
+    loader.config({
+      monaco: monacoEditor.default,
+    })
+
+    monaco = await loader.init()
+
+    // Determine schema based on the state
+    let schemaUri: string
+    if (state instanceof EditLayerState) {
+      schemaUri = "https://mapcomplete.org/schemas/layerconfig.json"
+    } else {
+      schemaUri = "https://mapcomplete.org/schemas/layoutconfig.json"
+    }
+
+    monaco.languages.json.jsonDefaults.setDiagnosticsOptions({
+      validate: true,
+      schemas: [
+        {
+          uri: schemaUri,
+          fileMatch: ["file.json"],
+          schema:
+            schemaUri === "https://mapcomplete.org/schemas/layerconfig.json"
+              ? layerSchemaJSON
+              : layoutSchemaJSON,
+        },
+      ],
+    })
+
+    let modelUri = monaco.Uri.parse("inmemory://inmemory/file.json")
+
+    // Create a new model
+    model = monaco.editor.createModel(
+      JSON.stringify(state.configuration.data, null, "  "),
+      "json",
+      modelUri
+    )
+
+    editor = monaco.editor.create(container, {
+      model,
+      automaticLayout: true,
+    })
+
+    // When the editor is changed, update the configuration, but only if the user hasn't typed for 500ms and the JSON is valid
+    let timeout: number
+    editor.onDidChangeModelContent(() => {
+      clearTimeout(timeout)
+      timeout = setTimeout(() => {
+        save()
+      }, 500)
+    })
+  })
+
+  onDestroy(() => {
+    if (editor) {
+      editor.dispose()
+    }
+    if (model) {
+      model.dispose()
+    }
+  })
+</script>
+
+<div bind:this={container} class="h-full w-full" />