A better `node -p`.

npm install js
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js is a a better alternative to node -p. It will automatically convert data from and to JSON string representations, and will automatically expose enviroment variables as globals preceded with $.


js <javascript>


Using math

js 2+2

Read a field from a JSON file

js stdin.version < package.json

Add a field to a JSON file on the fly

js 'stdin.foo = "bar", stdin' < in.json > out.json
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