diff --git a/netlify.toml b/netlify.toml
index 8380f27d0..adc4dff4c 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -5,8 +5,3 @@
 [build.environment]
   NODE_VERSION = "lts/*"
   YARN_VERSION = "1.22.22"
-
-[[headers]]
-  for = "/worker.js"
-  [headers.values]
-    Content-Security-Policy = "default-src 'self'; script-src 'self' 'unsafe-eval'"
diff --git a/website/playground/Playground.jsx b/website/playground/Playground.jsx
index 0357fd837..42c2b5e93 100644
--- a/website/playground/Playground.jsx
+++ b/website/playground/Playground.jsx
@@ -97,10 +97,9 @@ class Playground extends React.Component {
     const codeSample = getCodeSample(options.parser);
     const content = original.content || codeSample;
     const isDocExplorer = options.parser === "doc-explorer";
-    const needsClickForFirstRun = isDocExplorer && content !== codeSample;
     const selection = {};
 
-    this.state = { content, options, selection, needsClickForFirstRun };
+    this.state = { content, options, selection };
 
     this.handleOptionValueChange = this.handleOptionValueChange.bind(this);
 
@@ -171,10 +170,6 @@ class Playground extends React.Component {
           ? getCodeSample(options.parser)
           : state.content;
 
-      if (option.name === "parser") {
-        state.needsClickForFirstRun = false;
-      }
-
       return { options, content };
     });
   }
@@ -251,7 +246,6 @@ class Playground extends React.Component {
       <EditorState>
         {(editorState) => (
           <PrettierFormat
-            enabled={!this.state.needsClickForFirstRun}
             worker={worker}
             code={content}
             options={options}
@@ -465,42 +459,17 @@ class Playground extends React.Component {
                         />
                       ) : null}
                       {editorState.showOutput ? (
-                        this.state.needsClickForFirstRun ? (
-                          <div className="editor disabled-output-panel">
-                            <div className="explanation">
-                              <code>doc-explorer</code> involves running code
-                              provided by users.
-                            </div>
-                            <div className="explanation">
-                              To stay on the safe side and prevent abuse, an
-                              explicit user action is required when a direct
-                              link to a <code>doc-explorer</code> playground is
-                              opened.
-                            </div>
-                            <div className="explanation">
-                              Click the button below to start the playground.
-                            </div>
-                            <Button
-                              onClick={() =>
-                                this.setState({ needsClickForFirstRun: false })
-                              }
-                            >
-                              Start
-                            </Button>
-                          </div>
-                        ) : (
-                          <OutputPanel
-                            mode={util.getCodemirrorMode(options.parser)}
-                            value={formatted}
-                            ruler={options.printWidth}
-                            overlayStart={
-                              cursorOffset === -1 ? undefined : cursorOffset
-                            }
-                            overlayEnd={
-                              cursorOffset === -1 ? undefined : cursorOffset + 1
-                            }
-                          />
-                        )
+                        <OutputPanel
+                          mode={util.getCodemirrorMode(options.parser)}
+                          value={formatted}
+                          ruler={options.printWidth}
+                          overlayStart={
+                            cursorOffset === -1 ? undefined : cursorOffset
+                          }
+                          overlayEnd={
+                            cursorOffset === -1 ? undefined : cursorOffset + 1
+                          }
+                        />
                       ) : null}
                       {editorState.showSecondFormat && !isDocExplorer ? (
                         <OutputPanel
diff --git a/website/playground/PrettierFormat.js b/website/playground/PrettierFormat.js
index 87af04566..668206f9e 100644
--- a/website/playground/PrettierFormat.js
+++ b/website/playground/PrettierFormat.js
@@ -31,7 +31,6 @@ export default class PrettierFormat extends React.Component {
 
   async format() {
     const {
-      enabled,
       worker,
       code,
       options,
@@ -43,10 +42,6 @@ export default class PrettierFormat extends React.Component {
       rethrowEmbedErrors,
     } = this.props;
 
-    if (!enabled) {
-      return;
-    }
-
     const result = await worker.format(code, options, {
       ast,
       preprocessedAst,
diff --git a/website/static/prettier-plugin-doc-explorer.mjs b/website/static/prettier-plugin-doc-explorer.mjs
new file mode 100644
index 000000000..bf620a95c
--- /dev/null
+++ b/website/static/prettier-plugin-doc-explorer.mjs
@@ -0,0 +1,110 @@
+import prettierPackageManifest from "./lib/package-manifest.mjs";
+import * as prettier from "./lib/prettier/standalone.mjs";
+
+const builderNames = new Set(Object.keys(prettier.doc.builders));
+
+const parserName = "doc-explorer";
+const languageName = "Doc explorer";
+const astFormat = parserName;
+
+const expressionParserName = "__js_expression";
+async function getJsExpressionParser() {
+  const plugin = prettierPackageManifest.plugins.find((plugin) =>
+    plugin.parsers?.includes(expressionParserName),
+  );
+  const pluginModule = await import(`./lib/${plugin.file}`);
+  return pluginModule.parsers[expressionParserName];
+}
+
+// `Symbol.for('description')`
+function isSymbol(node) {
+  return (
+    node.type === "CallExpression" &&
+    node.callee.type === "MemberExpression" &&
+    !node.callee.computed &&
+    !node.callee.optional &&
+    node.callee.object.type === "Identifier" &&
+    node.callee.object.name === "Symbol" &&
+    node.callee.property.type === "Identifier" &&
+    node.callee.property.name === "for" &&
+    node.arguments.length === 1 &&
+    node.arguments[0].type === "StringLiteral"
+  );
+}
+
+function validateNode(node) {
+  if (!node?.type) {
+    return;
+  }
+
+  if (node.type === "ObjectExpression") {
+    for (const property of node.properties) {
+      if (
+        property.type !== "ObjectProperty" ||
+        property.computed ||
+        property.shorthand ||
+        property.method
+      ) {
+        throw new Error("Unexpected object property.");
+      }
+
+      const { value } = property;
+
+      if (isSymbol(value)) {
+        continue;
+      }
+
+      validateNode(value);
+    }
+    return;
+  }
+
+  if (node.type === "Identifier" && !builderNames.has(node.name)) {
+    throw new Error(`Unexpected identifier name '${node.name}'.`);
+  }
+
+  for (const value of Object.values(node)) {
+    const children = Array.isArray(value) ? value : [value];
+
+    for (const child of children) {
+      validateNode(child);
+    }
+  }
+}
+
+let expressionParser;
+async function validateDoc(text) {
+  expressionParser ??= await getJsExpressionParser();
+
+  const ast = expressionParser.parse(text);
+  if (ast.type !== "JsExpressionRoot") {
+    throw new Error("Invalid doc");
+  }
+
+  validateNode(ast.node);
+}
+
+async function parse(text) {
+  await validateDoc(text);
+
+  const value = new Function(
+    `{ ${Object.keys(prettier.doc.builders)} }`,
+    `const result = (${text || "''"}\n); return result;`,
+  )(prettier.doc.builders);
+
+  return { value };
+}
+
+export const parsers = {
+  [parserName]: {
+    parse,
+    astFormat,
+  },
+};
+export const printers = {
+  [astFormat]: {
+    print: ({ node }) => node.value,
+  },
+};
+
+export const languages = [{ name: languageName, parsers: [parserName] }];
diff --git a/website/static/worker.mjs b/website/static/worker.mjs
index 6f318ae34..c5c1a1c87 100644
--- a/website/static/worker.mjs
+++ b/website/static/worker.mjs
@@ -1,5 +1,6 @@
 import prettierPackageManifest from "./lib/package-manifest.mjs";
 import * as prettier from "./lib/prettier/standalone.mjs";
+import * as prettierPluginDocExplorer from "./prettier-plugin-doc-explorer.mjs";
 
 const pluginLoadPromises = new Map();
 async function importPlugin(plugin) {
@@ -38,28 +39,9 @@ function createPlugin(pluginManifest) {
   return plugin;
 }
 
-const docExplorerPlugin = {
-  parsers: {
-    "doc-explorer": {
-      parse: (text) =>
-        new Function(
-          `{ ${Object.keys(prettier.doc.builders)} }`,
-          `const result = (${text || "''"}\n); return result;`,
-        )(prettier.doc.builders),
-      astFormat: "doc-explorer",
-    },
-  },
-  printers: {
-    "doc-explorer": {
-      print: (path) => path.getValue(),
-    },
-  },
-  languages: [{ name: "doc-explorer", parsers: ["doc-explorer"] }],
-};
-
 const plugins = [
   ...prettierPackageManifest.plugins.map((plugin) => createPlugin(plugin)),
-  docExplorerPlugin,
+  prettierPluginDocExplorer,
 ];
 
 self.onmessage = async function (event) {