Usage in Express - date values passed to getting converted to strings

I’m fairly new to Express and ejs, but I have a project where an array of objects is passed to res.render(), including a date property (represented as a JS Date object).

I can see in the debugger the date values are objects when passed in, but in the template they are converted into strings and in the original array/object dates are similarly mutated. Is it possible that ejs does this, or is it a hidden feature of Express?

// before
[{name: string, date: Date}, {name: string, date: Date}]

// after render
[{name: string, date: string}, {name: string, date: string}]

[robations]

This turned out to be some middleware that had been installed (express-promise) mutating objects passed to the response object in express. Sorry about the extra noise.

[robations]

Nice one-liner 😃 Okay, I will try to eliminate components one by one, seems like there is some “magic” somewhere. Thanks for your info.