How to access a return value from a node script in BASH?

Question

Let's say I have a bash script that calls a node script. I've tried to do it like this:

b.sh file:

#!/bin/bash v=$(node app.js) echo "$v" 

app.js file:

#!/usr/bin/env node function f() {    return "test"; } return f(); 

How do I access the value returned by the node script ("test") from my bash script ?

Answer 1

@Daniel Lizik gave an good answer (now deleted) for the part: how to output the value, e.g. using his answer:

#!/usr/bin/env node function f() {    return "test"; } console.log(f()) 

And for the part how to capture the value in bash, do exactly as in your question:

#!/bin/bash val=$(node app.js) echo "node returned: $val" 

the above prints:

node returned: test