convert a JSON to a string array in typescript

I feel like I have quite an easy question but I just don't get to the answer... I parse the .text() of a response from my server with JSON.parse into JSON. And i actually can access the values of that JSON with: this.temp[0].name. Now i just want to iterate over that JSON and push the values into a string array. But how can i achieve this?

When i attempt to use for...of the compiler wants a string or an array but not a JSON. When i attempt to use for...in it actually does not go into the loop.

Here is some code where i can access it fine:

       this._pS.getAllProjects()
        .subscribe(data => this.temp = JSON.parse(data.text()),
            err => console.log(err),
            () => console.log("hello " + this.temp[0].name + this.temp[1].name));

When i just print it out after .stringify():

        this._pS.getAllProjects()
        .subscribe(data => this.temp = JSON.stringify(data),
            err => console.log(err),
            () => console.log("hello " + this.temp));

i get this in the browser console:

{"_body":"[{"name":"Projekt A"},{"name":"Projekt XYZ"}]",
"status":200,
"ok":true,
"statusText":"Ok",
"headers":{"Content-Type":["application/json; charset=utf-8"]},
"type":2,
"url":"http://127.0.0.1:3000/api/getAllProjectNames"}

tl;dr: how can i get the values out of text part of the body into a string array?

Thanks in advance