`vm.runInContext` Failed to evaluated object literal.

[NStal]

• Version: v7.7.1

• Platform: Linux kaka 4.4.0-62-generic Improving code readability on lib/_http_agent.js #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

• Subsystem: vm

let ctx = vm.createContext()
let value = vm.runInContext("{a:true,b:false}",ctx)

> let ctx = vm.createContext()
undefined
> let value = vm.runInContext("{a:true,b:false}",ctx)
evalmachine.<anonymous>:1
{a:true,b:false}
 ^
SyntaxError: Unexpected token :
> 

[mscdex]

Add parentheses around the object literal, otherwise V8 is interpreting it as a code block (the braces) containing a label called 'a' with the statement true. Then it doesn't expect another label after the comma, so throws the error you see. By adding the parentheses, you're giving a better hint to V8 on how to interpret the string.