diff --git a/packages/react-devtools-fusebox/package.json b/packages/react-devtools-fusebox/package.json
index bf5456d4cdac..644f42f04cdd 100644
--- a/packages/react-devtools-fusebox/package.json
+++ b/packages/react-devtools-fusebox/package.json
@@ -1,7 +1,7 @@
 {
   "name": "react-devtools-fusebox",
   "version": "0.0.0",
-  "private": "true",
+  "private": true,
   "license": "MIT",
   "files": ["dist"],
   "scripts": {
diff --git a/scripts/validate-all-package-private-fields.js b/scripts/validate-all-package-private-fields.js
new file mode 100644
index 000000000000..eaf66af39228
--- /dev/null
+++ b/scripts/validate-all-package-private-fields.js
@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+'use strict';
+
+/**
+ * Scans all packages/ directories and validates that `private` field
+ * (if present) is a boolean, per npm specification.
+ * 
+ * Usage: node scripts/validate-all-package-private-fields.js
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+function validatePrivateField(packageJsonPath) {
+  const content = fs.readFileSync(packageJsonPath, 'utf8');
+  const pkg = JSON.parse(content);
+  
+  if ('private' in pkg) {
+    if (typeof pkg.private !== 'boolean') {
+      return {
+        path: packageJsonPath,
+        error: `private must be boolean, got ${typeof pkg.private} ("${pkg.private}")`
+      };
+    }
+  }
+  return null;
+}
+
+const packagesDir = 'packages';
+const entries = fs.readdirSync(packagesDir);
+const packages = entries.filter(e => {
+  try {
+    const stat = fs.statSync(path.join(packagesDir, e));
+    return stat.isDirectory() && fs.existsSync(path.join(packagesDir, e, 'package.json'));
+  } catch {
+    return false;
+  }
+});
+
+let hasError = false;
+for (const pkgName of packages) {
+  const pkgPath = path.join(packagesDir, pkgName, 'package.json');
+  const error = validatePrivateField(pkgPath);
+  if (error) {
+    console.error(`ERROR: ${pkgName}: ${error.error}`);
+    hasError = true;
+  } else {
+    console.log(`✓ ${pkgName}`);
+  }
+}
+
+if (hasError) {
+  console.error('\nValidation failed: some packages have invalid private fields');
+  process.exit(1);
+} else {
+  console.log(`\nAll ${packages.length} packages passed validation`);
+}
diff --git a/scripts/validate-package-private-field.js b/scripts/validate-package-private-field.js
new file mode 100644
index 000000000000..891c8e36b0d0
--- /dev/null
+++ b/scripts/validate-package-private-field.js
@@ -0,0 +1,43 @@
+#!/usr/bin/env node
+'use strict';
+
+/**
+ * Validates that the `private` field in package.json is a boolean.
+ * Per npm specification, `private` must be a boolean value.
+ * 
+ * Usage: node scripts/validate-package-private-field.js <package-json-path>
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+function validatePrivateField(packageJsonPath) {
+  const content = fs.readFileSync(packageJsonPath, 'utf8');
+  const pkg = JSON.parse(content);
+  
+  if ('private' in pkg) {
+    if (typeof pkg.private !== 'boolean') {
+      console.error(
+        `ERROR: 'private' field in ${path.relative(process.cwd(), packageJsonPath)} ` +
+        `must be a boolean, got ${typeof pkg.private} ("${pkg.private}")`
+      );
+      process.exit(1);
+    }
+    console.log(`✓ ${path.relative(process.cwd(), packageJsonPath)}: private=${pkg.private} (boolean)`);
+  } else {
+    console.log(`✓ ${path.relative(process.cwd(), packageJsonPath)}: no private field`);
+  }
+}
+
+const pkgPath = process.argv[2];
+if (!pkgPath) {
+  console.error('Usage: node scripts/validate-package-private-field.js <package-json-path>');
+  process.exit(1);
+}
+
+try {
+  validatePrivateField(path.resolve(process.cwd(), pkgPath));
+} catch (err) {
+  console.error(err.message);
+  process.exit(1);
+}