如何在没有信息的情况下调试角度误差

Question

I get an error `ERROR Error: "[object Object]" in my console and my app just has a white screen. It was working fine, and I can't think what I've changed if anything. It shows as being in core.js not my code so how can I debug this?

My app is Angular version 7. Along time ago it was version 2, but has been upgraded over time.

Answer 1

Convert your object into json format

if you use pipe line easy to print data

let item of array | json

in ngfor loop

Answer 2

Figured it out. I had added code which tried to read environment variables from process.env . I figured this out by slowly reviewing all code that had gone in to the code base recently. Hope Angular gets better debugging soon. App built successfully with no error, yet failed at run time with no hint as to where in my code it was.