diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/README.md b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/README.md
new file mode 100644
index 000000000000..7131009e599b
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/README.md
@@ -0,0 +1,133 @@
+
+
+# isSafeToken
+
+> Test whether a JSON Pointer reference token is safe.
+
+
+
+
+
+This function tests whether a [JSON Pointer][json-pointer] reference token is safe to use for property traversal. Tokens matching `__proto__`, `constructor`, or `prototype` are considered unsafe as they are common prototype pollution vectors.
+
+
+
+
+
+
+
+
+
+## Usage
+
+```javascript
+var isSafeToken = require( '@stdlib/utils/json-pointer/base/assert/is-safe-token' );
+```
+
+#### isSafeToken( token )
+
+Tests whether a JSON Pointer reference token is safe.
+
+```javascript
+var bool = isSafeToken( 'foo' );
+// returns true
+
+bool = isSafeToken( '__proto__' );
+// returns false
+
+bool = isSafeToken( 'constructor' );
+// returns false
+
+bool = isSafeToken( 'prototype' );
+// returns false
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+## Examples
+
+
+
+```javascript
+var isSafeToken = require( '@stdlib/utils/json-pointer/base/assert/is-safe-token' );
+
+var bool = isSafeToken( 'foo' );
+// returns true
+
+bool = isSafeToken( '0' );
+// returns true
+
+bool = isSafeToken( '-' );
+// returns true
+
+bool = isSafeToken( '__proto__' );
+// returns false
+
+bool = isSafeToken( 'constructor' );
+// returns false
+
+bool = isSafeToken( 'prototype' );
+// returns false
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+[json-pointer]: https://tools.ietf.org/html/rfc6901
+
+
+
+
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/benchmark/benchmark.js b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/benchmark/benchmark.js
new file mode 100644
index 000000000000..a955ca90c766
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/benchmark/benchmark.js
@@ -0,0 +1,62 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
+var pkg = require( './../package.json' ).name;
+var isSafeToken = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+ var values;
+ var out;
+ var v;
+ var i;
+
+ values = [
+ 'foo',
+ 'bar',
+ '__proto__',
+ 'constructor',
+ 'prototype',
+ '0',
+ '-',
+ 'baz'
+ ];
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ v = values[ i % values.length ];
+ out = isSafeToken( v );
+ if ( typeof out !== 'boolean' ) {
+ b.fail( 'should return a boolean' );
+ }
+ }
+ b.toc();
+ if ( !isBoolean( out ) ) {
+ b.fail( 'should return a boolean' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+});
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/repl.txt b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/repl.txt
new file mode 100644
index 000000000000..2b0b06093e23
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/repl.txt
@@ -0,0 +1,32 @@
+
+{{alias}}( token )
+ Tests whether a JSON Pointer reference token is safe.
+
+ Parameters
+ ----------
+ token: string
+ JSON Pointer reference token.
+
+ Returns
+ -------
+ bool: boolean
+ Boolean indicating whether a token is safe.
+
+ Examples
+ --------
+ > var bool = {{alias}}( 'foo' )
+ true
+ > bool = {{alias}}( '0' )
+ true
+ > bool = {{alias}}( '-' )
+ true
+ > bool = {{alias}}( '__proto__' )
+ false
+ > bool = {{alias}}( 'constructor' )
+ false
+ > bool = {{alias}}( 'prototype' )
+ false
+
+ See Also
+ --------
+
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/types/index.d.ts b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/types/index.d.ts
new file mode 100644
index 000000000000..adca029e9c38
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/types/index.d.ts
@@ -0,0 +1,48 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+/**
+* Tests whether a JSON Pointer reference token is safe.
+*
+* @param token - reference token
+* @returns boolean indicating whether a token is safe
+*
+* @example
+* var bool = isSafeToken( 'foo' );
+* // returns true
+*
+* @example
+* var bool = isSafeToken( '__proto__' );
+* // returns false
+*
+* @example
+* var bool = isSafeToken( 'constructor' );
+* // returns false
+*
+* @example
+* var bool = isSafeToken( 'prototype' );
+* // returns false
+*/
+declare function isSafeToken( token: string ): boolean;
+
+
+// EXPORTS //
+
+export = isSafeToken;
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/types/test.ts b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/types/test.ts
new file mode 100644
index 000000000000..9a6131706819
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/docs/types/test.ts
@@ -0,0 +1,34 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import isSafeToken = require( './index' );
+
+
+// TESTS //
+
+// The function returns a boolean...
+{
+ isSafeToken( 'foo' ); // $ExpectType boolean
+ isSafeToken( '__proto__' ); // $ExpectType boolean
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+ isSafeToken(); // $ExpectError
+ isSafeToken( 'foo', 123 ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/examples/index.js b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/examples/index.js
new file mode 100644
index 000000000000..b81494ac9c6f
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/examples/index.js
@@ -0,0 +1,45 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var isSafeToken = require( './../lib' );
+
+var bool = isSafeToken( 'foo' );
+console.log( bool );
+// => true
+
+bool = isSafeToken( '0' );
+console.log( bool );
+// => true
+
+bool = isSafeToken( '-' );
+console.log( bool );
+// => true
+
+bool = isSafeToken( '__proto__' );
+console.log( bool );
+// => false
+
+bool = isSafeToken( 'constructor' );
+console.log( bool );
+// => false
+
+bool = isSafeToken( 'prototype' );
+console.log( bool );
+// => false
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/lib/index.js b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/lib/index.js
new file mode 100644
index 000000000000..f901786b8620
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/lib/index.js
@@ -0,0 +1,49 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Test whether a JSON Pointer reference token is safe.
+*
+* @module @stdlib/utils/json-pointer/base/assert/is-safe-token
+*
+* @example
+* var isSafeToken = require( '@stdlib/utils/json-pointer/base/assert/is-safe-token' );
+*
+* var bool = isSafeToken( 'foo' );
+* // returns true
+*
+* bool = isSafeToken( '__proto__' );
+* // returns false
+*
+* bool = isSafeToken( 'constructor' );
+* // returns false
+*
+* bool = isSafeToken( 'prototype' );
+* // returns false
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/lib/main.js b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/lib/main.js
new file mode 100644
index 000000000000..a3a30788f12d
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/lib/main.js
@@ -0,0 +1,67 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var contains = require( '@stdlib/array/base/assert/contains' ).factory;
+
+
+// VARIABLES //
+
+var PROPS = [
+ '__proto__',
+ 'constructor',
+ 'prototype'
+];
+var isInvalid = contains( PROPS );
+
+
+// MAIN //
+
+/**
+* Tests whether a JSON Pointer reference token is safe.
+*
+* @param {string} token - reference token
+* @returns {boolean} boolean indicating whether a token is safe
+*
+* @example
+* var bool = isSafeToken( 'foo' );
+* // returns true
+*
+* @example
+* var bool = isSafeToken( '__proto__' );
+* // returns false
+*
+* @example
+* var bool = isSafeToken( 'constructor' );
+* // returns false
+*
+* @example
+* var bool = isSafeToken( 'prototype' );
+* // returns false
+*/
+function isSafeToken( token ) {
+ return !isInvalid( token );
+}
+
+
+// EXPORTS //
+
+module.exports = isSafeToken;
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/package.json b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/package.json
new file mode 100644
index 000000000000..95f5cd308efb
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/package.json
@@ -0,0 +1,73 @@
+{
+ "name": "@stdlib/utils/json-pointer/base/assert/is-safe-token",
+ "version": "0.0.0",
+ "description": "Test whether a JSON Pointer reference token is safe.",
+ "license": "Apache-2.0",
+ "author": {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ },
+ "contributors": [
+ {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ }
+ ],
+ "main": "./lib",
+ "directories": {
+ "benchmark": "./benchmark",
+ "doc": "./docs",
+ "example": "./examples",
+ "lib": "./lib",
+ "test": "./test"
+ },
+ "types": "./docs/types",
+ "scripts": {},
+ "homepage": "https://github.com/stdlib-js/stdlib",
+ "repository": {
+ "type": "git",
+ "url": "git://github.com/stdlib-js/stdlib.git"
+ },
+ "bugs": {
+ "url": "https://github.com/stdlib-js/stdlib/issues"
+ },
+ "dependencies": {},
+ "devDependencies": {},
+ "engines": {
+ "node": ">=0.10.0",
+ "npm": ">2.7.0"
+ },
+ "os": [
+ "aix",
+ "darwin",
+ "freebsd",
+ "linux",
+ "macos",
+ "openbsd",
+ "sunos",
+ "win32",
+ "windows"
+ ],
+ "keywords": [
+ "stdlib",
+ "stdutils",
+ "utilities",
+ "utility",
+ "utils",
+ "util",
+ "base",
+ "assert",
+ "test",
+ "check",
+ "is",
+ "json",
+ "pointer",
+ "json-pointer",
+ "rfc6901",
+ "token",
+ "safe",
+ "prototype",
+ "pollution",
+ "security"
+ ]
+}
diff --git a/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/test/test.js b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/test/test.js
new file mode 100644
index 000000000000..7672806037aa
--- /dev/null
+++ b/lib/node_modules/@stdlib/utils/json-pointer/base/assert/is-safe-token/test/test.js
@@ -0,0 +1,77 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var isSafeToken = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof isSafeToken, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function returns `false` if provided an unsafe token (prototype pollution vector)', function test( t ) {
+ var values;
+ var bool;
+ var i;
+
+ values = [
+ '__proto__',
+ 'constructor',
+ 'prototype'
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ bool = isSafeToken( values[ i ] );
+ t.strictEqual( bool, false, 'returns expected value' );
+ }
+ t.end();
+});
+
+tape( 'the function returns `true` if provided a safe reference token', function test( t ) {
+ var values;
+ var bool;
+ var i;
+
+ values = [
+ 'foo',
+ 'bar',
+ 'baz',
+ '0',
+ '1',
+ '-',
+ 'a/b',
+ 'm~n',
+ '',
+ 'hello world',
+ 'toString',
+ 'valueOf',
+ 'hasOwnProperty'
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ bool = isSafeToken( values[ i ] );
+ t.strictEqual( bool, true, 'returns expected value' );
+ }
+ t.end();
+});