# 解决Node.js mysql客户端不支持认证协议引发的“ER\_NOT\_SUPPORTED\_AUTH\_MODE”问题 2019-06-12[Node.js](https://waylau.com/categories/#Node.js)[MySQL](https://waylau.com/categories/#MySQL)[Node.js](https://waylau.com/tags/#Node.js)[mysql](https://waylau.com/tags/#mysql)[MySQL](https://waylau.com/tags/#MySQL) mysql模块（项目地址为[https://github.com/mysqljs/mysql](https://github.com/mysqljs/mysql)）是一个开源的、JavaScript编写的MySQL驱动，可以在Node.js应用中来操作MySQL。但在使用过程中，出现了“ER\_NOT\_SUPPORTED\_AUTH\_MODE”问题。 本文介绍了出现该问题的原因及解决方案。 ## 报错信息 当我试图使用mysql模块来连接MySQL 8时，出现了如下错误信息： ~~~ D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\index.js:17 throw error; ^ Error: ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client at Handshake.Sequence._packetToError (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\protocol\sequences\Sequence.js:47:14) at Handshake.ErrorPacket (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\protocol\sequences\Handshake.js:123:18) at Protocol._parsePacket (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\protocol\Protocol.js:291:23) at Parser._parsePacket (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\protocol\Parser.js:433:10) at Parser.write (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\protocol\Parser.js:43:10) at Protocol.write (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\protocol\Protocol.js:38:16) at Socket.<anonymous> (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\Connection.js:91:28) at Socket.<anonymous> (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\Connection.js:525:10) at Socket.emit (events.js:196:13) at addChunk (_stream_readable.js:290:12) -------------------- at Protocol._enqueue (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\protocol\Protocol.js:144:48) at Protocol.handshake (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\protocol\Protocol.js:51:23) at Connection.connect (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\node_modules\mysql\lib\Connection.js:119:18) at Object.<anonymous> (D:\workspaceGithub\nodejs-book-samples\samples\mysql-demo\index.js:12:12) at Module._compile (internal/modules/cjs/loader.js:759:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10) at Module.load (internal/modules/cjs/loader.js:628:32) at Function.Module._load (internal/modules/cjs/loader.js:555:12) at Function.Module.runMain (internal/modules/cjs/loader.js:826:10) at internal/main/run_main_module.js:17:11 ~~~ ## 出错原因 导致这个错误的原因是，目前，最新的mysql模块并未完全支持MySQL 8的“caching\_sha2\_password”加密方式，而“caching\_sha2\_password”在MySQL 8中是默认的加密方式。因此，下面的方式命令是默认已经使用了“caching\_sha2\_password”加密方式，该账号、密码无法在mysql模块中使用。 ~~~ mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456'; Query OK, 0 rows affected (0.12 sec) ~~~ ## 解决方法 解决方法是从新修改用户root的密码，并指定mysql模块能够支持的加密方式： ~~~ mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456'; Query OK, 0 rows affected (0.12 sec) ~~~ 上述语句，显示指定了使用“mysql\_native\_password”的加密方式。这种方式是在mysql模块能够支持。 再此运行应用，可以看到如下的控制台输出信息： ~~~ $ node index.js The result is: RowDataPacket { user_id: 1, username: '老卫' } ~~~ 其中，“RowDataPacket { user\_id: 1, username: ‘老卫’ }”就是数据库查询的结果。