IBM Datapower - Oauth impementation

"{ "error":"invalid_request", "error_description":"Cannot determine the request type" }"

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npm install -g npm ERR! Error: EPERM: operation not permitted, open

C:\Users\Srinivas>npm install -g bower
npm WARN deprecated bower@1.8.0: ..psst! While Bower is maintained, we recommend Yarn and Webpack for *new* front-end projects! Yarn's advantage is security and reliability, and Webpack's is support for both CommonJS and AMD projects. Currently there
's no migration path, but please help to create it: https://github.com/bower/bower/issues/2467
npm ERR! tar.unpack untar error C:\Users\Srinivas\AppData\Roaming\npm-cache\bower\1.8.0\package.tgz
npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "bower"
npm ERR! node v4.5.0
npm ERR! npm  v2.15.9
npm ERR! path C:\Users\Srinivas\AppData\Roaming\npm\node_modules\bower\lib\config.js
npm ERR! code EPERM
npm ERR! errno -4048
npm ERR! syscall open

npm ERR! Error: EPERM: operation not permitted, open 'C:\Users\Srinivas\AppData\Roaming\npm\node_modules\bower\lib\config.js'
npm ERR!     at Error (native)
npm ERR!  { [Error: EPERM: operation not permitted, open 'C:\Users\Srinivas\AppData\Roaming\npm\node_modules\bower\lib\config.js']
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'open',
npm ERR!   path: 'C:\\Users\\Srinivas\\AppData\\Roaming\\npm\\node_modules\\bower\\lib\\config.js' }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\Users\Srinivas\npm-debug.log



Solution :
clean npm cache 

C:\Users\Srinivas>npm cache clean

Then try

C:\Users\Srinivas>npm install -g bower
npm WARN deprecated bower@1.8.0: ..psst! While Bower is maintained, we recommend Yarn and Webpack for *new* front-end projects! Yarn's advantage is security and reliability, and We
's no migration path, but please help to create it: https://github.com/bower/bower/issues/2467
C:\Users\Srinivas\AppData\Roaming\npm\bower -> C:\Users\Srinivas\AppData\Roaming\npm\node_modules\bower\bin\bower
bower@1.8.0 C:\Users\Srinivas\AppData\Roaming\npm\node_modules\bower

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Nodejs self signed certificate issues

{ [Error: unable to verify the first certificate] code: 'UNABLE_TO_VERIFY_LEAF_SIGNATURE' }


{ [Error: self signed certificate] code: 'DEPTH_ZERO_SELF_SIGNED_CERT' }

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SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

    at exports.runInThisContext (vm.js:53:16)

    at Module._compile (module.js:373:25)

    at Object.Module._extensions..js (module.js:416:10)

    at Module.load (module.js:343:32)

    at Function.Module._load (module.js:300:12)

    at Module.require (module.js:353:17)

    at require (internal/module.js:12:17)

    at Object.<anonymous> (/Users/srinivasnidadavolu/Downloads/testapp/app.js:42:20)

    at Module._compile (module.js:409:26)

    at Object.Module._extensions..js (module.js:416:10)

    at Module.load (module.js:343:32)

    at Function.Module._load (module.js:300:12)

    at Function.Module.runMain (module.js:441:10)

    at startup (node.js:139:18)

    at node.js:974:3

solution:

Declare strict mode at the beginning of the function or constant to use Block-scoped declarations.

"use strict"

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