DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.

The Buffer constructor (new Buffer(...)) has been deprecated for a long time because of security issues (uninitialized memory). It will eventually be removed. All new code must use Buffer.from(), Buffer.alloc() or Buffer.allocUnsafe().

💡 Verified Solution

Replace new Buffer(str) / new Buffer(size) with Buffer.from(str) or Buffer.alloc(size).

Patch / Unified Code Diff:

--- old.js
+++ new.js
@@ -1,3 +1,3 @@
-const buf1 = new Buffer("hello");
-const buf2 = new Buffer(10);
+const buf1 = Buffer.from("hello");
+const buf2 = Buffer.alloc(10);

Official Primary Reference: https://nodejs.org/api/buffer.html#buffer-from-array

🧪 Sandbox Execution Evidence

Exit Code: 0

Tests Passed: 1 / 1

Confidence: 95%

Protocol: MCP 2026

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