encoding problems unicode to utf8 with nodejs/emberjs

I come back with a new question, here we go I transfered an emberJs application from GoogleCloud to a new server OVH. But eversince I got encoding problem.

I get a json response containing those character '\u0102\u0160' before it was decoded as é but instead I have a foncĂŠs. It is the exact same code.

Can anyone help me with that issue ?