diff --git a/cli/dts/lib.deno.ns.d.ts b/cli/dts/lib.deno.ns.d.ts
index da016db8ae..e838585865 100644
--- a/cli/dts/lib.deno.ns.d.ts
+++ b/cli/dts/lib.deno.ns.d.ts
@@ -2193,14 +2193,14 @@ declare namespace Deno {
    * console.log(obj);  // prints same value as objAsString, e.g. { a: 10, b: "hello" }
    * ```
    *
-   * You can also register custom inspect functions, via the `customInspect` Deno
-   * symbol on objects, to control and customize the output.
+   * You can also register custom inspect functions, via the symbol `Symbol.for("Deno.customInspect")`,
+   * on objects, to control and customize the output.
    *
    * ```ts
    * class A {
    *   x = 10;
    *   y = "hello";
-   *   [Deno.customInspect](): string {
+   *   [Symbol.for("Deno.customInspect")](): string {
    *     return "x=" + this.x + ", y=" + this.y;
    *   }
    * }
@@ -2388,9 +2388,13 @@ declare namespace Deno {
    */
   export const args: string[];
 
-  /** A symbol which can be used as a key for a custom method which will be
+  /**
+   * @deprecated A symbol which can be used as a key for a custom method which will be
    * called when `Deno.inspect()` is called, or when the object is logged to
-   * the console. */
+   * the console.
+   *
+   * This symbol is deprecated since 1.9. Use `Symbol.for("Deno.customInspect")` instead.
+   */
   export const customInspect: unique symbol;
 
   /** The URL of the entrypoint module entered from the command-line. */
diff --git a/cli/tests/unit/console_test.ts b/cli/tests/unit/console_test.ts
index 8013da1529..edb1b245f9 100644
--- a/cli/tests/unit/console_test.ts
+++ b/cli/tests/unit/console_test.ts
@@ -17,7 +17,7 @@ import {
 } from "./test_util.ts";
 import { stripColor } from "../../../test_util/std/fmt/colors.ts";
 
-const customInspect = Deno.customInspect;
+const customInspect = Symbol.for("Deno.customInspect");
 const {
   Console,
   cssToAnsi: cssToAnsi_,
@@ -879,6 +879,18 @@ unitTest(function consoleTestWithCustomInspector(): void {
   assertEquals(stringify(new A()), "b");
 });
 
+unitTest(function consoleTestWithCustomInspectorUsingInspectFunc(): void {
+  class A {
+    [customInspect](
+      inspect: (v: unknown, opts?: Deno.InspectOptions) => string,
+    ): string {
+      return "b " + inspect({ c: 1 });
+    }
+  }
+
+  assertEquals(stringify(new A()), "b { c: 1 }");
+});
+
 unitTest(function consoleTestWithCustomInspectorError(): void {
   class A {
     [customInspect](): never {
diff --git a/extensions/console/02_console.js b/extensions/console/02_console.js
index 3391b520b4..ddfcbf47a5 100644
--- a/extensions/console/02_console.js
+++ b/extensions/console/02_console.js
@@ -203,7 +203,7 @@
   function inspectFunction(value, level, inspectOptions) {
     const cyan = maybeColor(colors.cyan, inspectOptions);
     if (customInspect in value && typeof value[customInspect] === "function") {
-      return String(value[customInspect]());
+      return String(value[customInspect](inspect));
     }
     // Might be Function/AsyncFunction/GeneratorFunction/AsyncGeneratorFunction
     let cstrName = Object.getPrototypeOf(value)?.constructor?.name;
@@ -901,22 +901,22 @@
     inspectOptions,
   ) {
     if (customInspect in value && typeof value[customInspect] === "function") {
-      return String(value[customInspect]());
+      return String(value[customInspect](inspect));
     }
-    // This non-unique symbol is used to support extensions, ie.
-    // in extensions/web we don't want to depend on unique "Deno.customInspect"
-    // symbol defined in the public API. Internal only, shouldn't be used
-    // by users.
-    const nonUniqueCustomInspect = Symbol.for("Deno.customInspect");
+    // This non-unique symbol is used to support op_crates, ie.
+    // in extensions/web we don't want to depend on public
+    // Symbol.for("Deno.customInspect") symbol defined in the public API.
+    // Internal only, shouldn't be used by users.
+    const privateCustomInspect = Symbol.for("Deno.privateCustomInspect");
     if (
-      nonUniqueCustomInspect in value &&
-      typeof value[nonUniqueCustomInspect] === "function"
+      privateCustomInspect in value &&
+      typeof value[privateCustomInspect] === "function"
     ) {
       // TODO(nayeemrmn): `inspect` is passed as an argument because custom
       // inspect implementations in `extensions` need it, but may not have access
       // to the `Deno` namespace in web workers. Remove when the `Deno`
       // namespace is always enabled.
-      return String(value[nonUniqueCustomInspect](inspect));
+      return String(value[privateCustomInspect](inspect));
     }
     if (value instanceof Error) {
       return String(value.stack);
@@ -1760,7 +1760,7 @@
     }
   }
 
-  const customInspect = Symbol("Deno.customInspect");
+  const customInspect = Symbol.for("Deno.customInspect");
 
   function inspect(
     value,
diff --git a/extensions/fetch/20_headers.js b/extensions/fetch/20_headers.js
index 26500b602f..59f81a8ff9 100644
--- a/extensions/fetch/20_headers.js
+++ b/extensions/fetch/20_headers.js
@@ -370,7 +370,7 @@
       }
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       const headers = {};
       for (const header of this) {
         headers[header[0]] = header[1];
diff --git a/extensions/url/00_url.js b/extensions/url/00_url.js
index 2daae8d453..7b1c6e06ab 100644
--- a/extensions/url/00_url.js
+++ b/extensions/url/00_url.js
@@ -222,7 +222,7 @@
       this[_url] = parts;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       const object = {
         href: this.href,
         origin: this.origin,
diff --git a/extensions/web/02_event.js b/extensions/web/02_event.js
index 7a270881f0..081869efdf 100644
--- a/extensions/web/02_event.js
+++ b/extensions/web/02_event.js
@@ -143,7 +143,7 @@
       });
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return inspect(buildFilteredPropertyInspectObject(this, EVENT_PROPS));
     }
 
@@ -1055,7 +1055,7 @@
       return "ErrorEvent";
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return inspect(buildFilteredPropertyInspectObject(this, [
         ...EVENT_PROPS,
         "message",
@@ -1109,7 +1109,7 @@
       this.#reason = reason;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return inspect(buildFilteredPropertyInspectObject(this, [
         ...EVENT_PROPS,
         "wasClean",
@@ -1137,7 +1137,7 @@
       this.lastEventId = eventInitDict?.lastEventId ?? "";
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return inspect(buildFilteredPropertyInspectObject(this, [
         ...EVENT_PROPS,
         "data",
@@ -1167,7 +1167,7 @@
       return "CustomEvent";
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return inspect(buildFilteredPropertyInspectObject(this, [
         ...EVENT_PROPS,
         "detail",
@@ -1190,7 +1190,7 @@
       this.total = eventInitDict?.total ?? 0;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return inspect(buildFilteredPropertyInspectObject(this, [
         ...EVENT_PROPS,
         "lengthComputable",
diff --git a/extensions/web/06_streams.js b/extensions/web/06_streams.js
index 127436d43a..d26a1a4126 100644
--- a/extensions/web/06_streams.js
+++ b/extensions/web/06_streams.js
@@ -3304,7 +3304,7 @@
       return iterator;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${inspect({ locked: this.locked })}`;
     }
 
@@ -3424,7 +3424,7 @@
       return readableStreamReaderGenericCancel(this, reason);
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${inspect({ closed: this.closed })}`;
     }
 
@@ -3821,7 +3821,7 @@
       return this[_writable];
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({ readable: this.readable, writable: this.writable })
       }`;
@@ -4022,7 +4022,7 @@
       return acquireWritableStreamDefaultWriter(this);
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${inspect({ locked: this.locked })}`;
     }
 
diff --git a/extensions/web/12_location.js b/extensions/web/12_location.js
index 2b6580f8be..75012396a9 100644
--- a/extensions/web/12_location.js
+++ b/extensions/web/12_location.js
@@ -165,7 +165,7 @@
           },
           enumerable: true,
         },
-        [Symbol.for("Deno.customInspect")]: {
+        [Symbol.for("Deno.privateCustomInspect")]: {
           value: function (inspect) {
             const object = {
               hash: this.hash,
@@ -322,7 +322,7 @@
       value: "WorkerLocation",
       configurable: true,
     },
-    [Symbol.for("Deno.customInspect")]: {
+    [Symbol.for("Deno.privateCustomInspect")]: {
       value: function (inspect) {
         const object = {
           hash: this.hash,
diff --git a/extensions/webgpu/01_webgpu.js b/extensions/webgpu/01_webgpu.js
index 23beaf1cc3..5ff6cde461 100644
--- a/extensions/webgpu/01_webgpu.js
+++ b/extensions/webgpu/01_webgpu.js
@@ -167,7 +167,7 @@
       }
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${inspect({})}`;
     }
   }
@@ -271,7 +271,7 @@
       );
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           name: this.name,
@@ -388,7 +388,7 @@
       return this[_limits].maxVertexBufferArrayStride;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${inspect(this[_limits])}`;
     }
   }
@@ -451,7 +451,7 @@
       return this[_features][Symbol.iterator]();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${inspect([...this.values()])}`;
     }
   }
@@ -492,7 +492,7 @@
       return this[_message];
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({ reason: this[_reason], message: this[_message] })
       }`;
@@ -1292,7 +1292,7 @@
       return scope.error ?? null;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           features: this.features,
@@ -1478,7 +1478,7 @@
       throw new Error("Not yet implemented");
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -1793,7 +1793,7 @@
       this[_cleanup]();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -1932,7 +1932,7 @@
       this[_cleanup]();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -1999,7 +1999,7 @@
       webidl.illegalConstructor();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -2042,7 +2042,7 @@
       webidl.illegalConstructor();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -2085,7 +2085,7 @@
       webidl.illegalConstructor();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -2128,7 +2128,7 @@
       webidl.illegalConstructor();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -2171,7 +2171,7 @@
       webidl.illegalConstructor();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -2218,7 +2218,7 @@
       throw new Error("Not yet implemented");
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -2312,7 +2312,7 @@
       return bindGroupLayout;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -2387,7 +2387,7 @@
       return bindGroupLayout;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -3150,7 +3150,7 @@
       return commandBuffer;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -3966,7 +3966,7 @@
       });
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -4369,7 +4369,7 @@
       });
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -4417,7 +4417,7 @@
       throw new Error("Not yet implemented");
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -4873,7 +4873,7 @@
       throw new Error("Not yet implemented");
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -4917,7 +4917,7 @@
       webidl.illegalConstructor();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
@@ -4971,7 +4971,7 @@
       this[_cleanup]();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({
           label: this.label,
diff --git a/runtime/js/40_permissions.js b/runtime/js/40_permissions.js
index b36fb643a5..00b1a29741 100644
--- a/runtime/js/40_permissions.js
+++ b/runtime/js/40_permissions.js
@@ -87,7 +87,7 @@
       return dispatched;
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${
         inspect({ state: this.state, onchange: this.onchange })
       }`;
diff --git a/runtime/js/90_deno_ns.js b/runtime/js/90_deno_ns.js
index 9d05908787..3d17fccf62 100644
--- a/runtime/js/90_deno_ns.js
+++ b/runtime/js/90_deno_ns.js
@@ -53,6 +53,8 @@
     ftruncateSync: __bootstrap.fs.ftruncateSync,
     ftruncate: __bootstrap.fs.ftruncate,
     errors: __bootstrap.errors.errors,
+    // TODO(kt3k): Remove this export at v2
+    // See https://github.com/denoland/deno/issues/9294
     customInspect: __bootstrap.console.customInspect,
     inspect: __bootstrap.console.inspect,
     env: __bootstrap.os.env,
diff --git a/runtime/js/99_main.js b/runtime/js/99_main.js
index d0e86bce7c..db334caeab 100644
--- a/runtime/js/99_main.js
+++ b/runtime/js/99_main.js
@@ -247,7 +247,7 @@ delete Object.prototype.__proto__;
       webidl.illegalConstructor();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${inspect({})}`;
     }
   }
@@ -270,7 +270,7 @@ delete Object.prototype.__proto__;
       webidl.illegalConstructor();
     }
 
-    [Symbol.for("Deno.customInspect")](inspect) {
+    [Symbol.for("Deno.privateCustomInspect")](inspect) {
       return `${this.constructor.name} ${inspect({})}`;
     }
   }