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In express JS During the course of dynamic routing I want to verify the parameters passed i.e req.params.PARAMETER_PASSED. So i tried to install express-validation module by "npm install express-validation". but it generates an error like "UNMET PEER DEPENDENCY joi@*" and I even wanna know what difference it makes if I use "npm install express-validation --save" what does --save mean.

Trailblazer
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  • Possible duplicate of [Why does npm install say I have unmet dependencies?](http://stackoverflow.com/questions/20764881/why-does-npm-install-say-i-have-unmet-dependencies) – isuruAb Mar 20 '17 at 06:46

1 Answers1

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Read this for avoid UNMET PEER DEPENDENCY problem.
you can use --save for add this dependency into your package.json file. If not it install relevant dependency into node_modules folder but will not add into package.json file.

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isuruAb
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