The New and Important things in Node 8 are :
N-API (Node.js API) : N-API or Node.js API will help Node.js Developers to build native addons. APIs which are exposed by N-API are generally used to create and manipulate JavaScript values. N-API does not depend on V8 and is purely maintained as part of Node.js itself.Async Hooks (async_hooks) : Async Hooks API will allow the developers to track asynchronous requests and handles through their complete lifecycle.
Zero-Filling Buffers and Deprecation Flag : Buffers are now filled with zeros by default thus prevents leak-in data and also increases perdormance. But if you do not want your Buffers to be Zero filled you can use Buffer.allocUnsafe(10) which allocate Buffer instances with uninitialized memory. --pending-deprecation flag will emit a deprecation warning and Buffer methods will now accept Uint8Array as input.
Child Process Improvement : Argument and kill signal validations have been improved in Child Process and also Child Process methods not accept Uint8Array as input.
Console Methods Improvement : Application will not crash when error events will be emitted when using console methods. Thus it will make console.log() and other APIs safe.
Static Error Code : Now all the error generated by Node.js will be assigned a static error code thus will help in debugging the error in much better way.
Redirect Warning in Process : Process warning output can be redirected to a file using --redirect-warnings command-line argument and also they may now include additional detail.
Streams New Methods : Stream now supports destroy(), _destroy() and _final() APIs.
There are lot of noticeable changes happened in Node.js Version 8 like N-API, Async Hooks, Zero-Filling Buffers which will make Node.js 8 an improved version as far as performance is concerned. The full list can be found on GitHub Node.js ChangeLOG.
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