#992·node-jsonwebtoken

Node 24 compatibility

Author: benfosterlitmosCreated May 7, 2025Updated Apr 28, 2026

Description

jsonwebtoken doesn't work with Node 24. The buffer-equal-constant-time library throws an error:

Cannot read properties of undefined (reading 'prototype')

var origSlowBufEqual = SlowBuffer.prototype.equal;

buffer-equal-constant-time is a nested dep: jsonwebtoken > jws > jwa > buffer-equal-constant-time

Reproduction

Initialize a new Node project and install jsonwebtoken.

Run the following JS using Node 24.0.0

javascript

import jsonwebtoken from "jsonwebtoken";

jsonwebtoken.sign({ text: "test" }, "ABC");

Result:

bash

var origSlowBufEqual = SlowBuffer.prototype.equal;
                                  ^

TypeError: Cannot read properties of undefined (reading 'prototype')
    at Object.<anonymous> (/Users/user/testnode24/node_modules/buffer-equal-constant-time/index.js:37:35)
    at Module._compile (node:internal/modules/cjs/loader:1734:14)
    at Object..js (node:internal/modules/cjs/loader:1899:10)
    at Module.load (node:internal/modules/cjs/loader:1469:32)
    at Module._load (node:internal/modules/cjs/loader:1286:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
    at Module.require (node:internal/modules/cjs/loader:1491:12)
    at require (node:internal/modules/helpers:135:16)
    at Object.<anonymous> (/Users/user/testnode24/node_modules/jwa/index.js:1:19)

Node.js v24.0.0

Environment

jsonwebtoken 9.0.2
Node 24.0.0
MacOS Sequoia

Running in Node 22 works without any issues.

Source: auth0/node-jsonwebtoken

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