diff --git a/src/notarytool.ts b/src/notarytool.ts
index 4f48108..649aa57 100644
--- a/src/notarytool.ts
+++ b/src/notarytool.ts
@@ -64,6 +64,31 @@ async function getNotarizationLogs(opts: NotarizeOptions, id: string) {
   }
 }
 
+export function parseNotarytoolOutput(output: string): any {
+  const rawOut = output.trim();
+
+  let jsonOut: string = '';
+
+  for (const line of rawOut.split('\n')) {
+    const trimmedLine = line.trim();
+    if (trimmedLine.startsWith('{') && trimmedLine.endsWith('}')) {
+      jsonOut = line;
+      break;
+    }
+  }
+
+  d('notarytool produced output:\n', output);
+
+  let parsed: any;
+  try {
+    parsed = JSON.parse(jsonOut);
+  } catch (err) {
+    throw new Error(`Could not parse notarytool output: \n\n${rawOut}`);
+  }
+
+  return parsed;
+}
+
 export async function isNotaryToolAvailable(notarytoolPath?: string) {
   if (notarytoolPath !== undefined) {
     const result = await spawn(notarytoolPath, ['--version']);
@@ -110,16 +135,8 @@ export async function notarizeAndWaitForNotaryTool(opts: NotarizeOptions) {
     ];
 
     const result = await runNotaryTool(notarizeArgs, opts.notarytoolPath);
-    const rawOut = result.output.trim();
-
-    let parsed: any;
-    try {
-      parsed = JSON.parse(rawOut);
-    } catch (err) {
-      throw new Error(
-        `Failed to notarize via notarytool.  Failed with unexpected result: \n\n${rawOut}`,
-      );
-    }
+
+    const parsed = parseNotarytoolOutput(result.output);
 
     let logOutput: undefined | string;
     if (typeof parsed.id === 'string') {
diff --git a/test/notarytool.test.ts b/test/notarytool.test.ts
new file mode 100644
index 0000000..fe3a8ce
--- /dev/null
+++ b/test/notarytool.test.ts
@@ -0,0 +1,65 @@
+import { describe, expect, it } from 'vitest';
+import { parseNotarytoolOutput } from '../src/notarytool.js';
+
+describe('parseNotarytoolOutput', () => {
+  it('parses valid JSON output', () => {
+    const output = '{"status": "Accepted", "id": "123"}';
+    expect(parseNotarytoolOutput(output)).toEqual({
+      status: 'Accepted',
+      id: '123',
+    });
+  });
+
+  it('parses JSON with whitespace', () => {
+    const output = '\n\n  {"status": "Accepted", "id": "456"}  \n';
+    expect(parseNotarytoolOutput(output)).toEqual({
+      status: 'Accepted',
+      id: '456',
+    });
+  });
+
+  it('parses JSON with warnings before it', () => {
+    const output = 'Warning: Some warning message\n{"status": "Accepted", "id": "789"}';
+    expect(parseNotarytoolOutput(output)).toEqual({
+      status: 'Accepted',
+      id: '789',
+    });
+  });
+
+  it('parses JSON with warnings after it', () => {
+    const output = '{"status": "Accepted", "id": "abc"}\nWarning: Some warning message';
+    expect(parseNotarytoolOutput(output)).toEqual({
+      status: 'Accepted',
+      id: 'abc',
+    });
+  });
+
+  it('parses JSON with warnings before and after it', () => {
+    const output =
+      'Warning: First warning\n{"status": "Invalid", "id": "def"}\nWarning: Second warning';
+    expect(parseNotarytoolOutput(output)).toEqual({
+      status: 'Invalid',
+      id: 'def',
+    });
+  });
+
+  it('throws error for invalid JSON', () => {
+    const output = 'not json at all';
+    expect(() => parseNotarytoolOutput(output)).toThrow(
+      'Could not parse notarytool output: \n\nnot json at all',
+    );
+  });
+
+  it('throws error for incomplete JSON', () => {
+    const output = '{"status": "Accepted"';
+    expect(() => parseNotarytoolOutput(output)).toThrow('Could not parse notarytool output');
+  });
+
+  it('parses nested JSON objects', () => {
+    const output = '{"status": "Accepted", "data": {"nested": "value"}}';
+    expect(parseNotarytoolOutput(output)).toEqual({
+      status: 'Accepted',
+      data: { nested: 'value' },
+    });
+  });
+});