Node.jsâs Niche
Since JavaScript first appeared in 1995, it has been solving problems all along the front-end/back-end spectrum. The following figure shows this spectrum and where Node.js fits within it.
In the web browser on the right, much of the scripting involves waiting for user interaction: click here, drag that, choose a file, etc. JavaScript has been extraordinarily successful in this space.
On the left, back-end databases are investing heavily in JavaScript. Document-oriented databases like MongoDB and CouchDB use JavaScript extensivelyâfrom modifying records to ad-hoc queries and mapreduce jobs. Other NoSQL datastores, like Elasticsearch ...
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