convert a JSON to a string array in typescript
Solution 1
If the response is what you included then it's simple:
JSON.parse(data.text()).forEach(item => {
console.log(item.name);
});
As your body is an array of objects of this interface:
interface ObjectInResponseArray {
name: string;
}
Solution 2
First off, you're mixing up JSON and objects. JSON is a text format for transferring data. Once you parse it (JSON.parse
) you've got an object or an array, depending on the contents of the JSON.
var json = "{\"key\": \"value\" }";
var object = JSON.parse(json);
json = "[1, 2, \"three\"]";
var array = JSON.parse(json);
Next, it looks like you already have an object. If you do JSON.stringify
, you're converting an object into a string. So you can access your data
object directly. No need to convert one way or the other.
console.log(data._body[0]);
Are you familiar with for
loops? They're the most common way of iterating through an array in JavaScript (and most languages, actually). For example:
var objs = [
{
name: 'Bugs'
},
{
name: 'Bunny'
}
];
for (var i = 0; i < objs.length; i++) {
var obj = objs[i];
console.log(obj.name);
}
Given all of that, you should be able to iterate over your data._body
array and access the name
property on each element.
Since your question is a bit unclear, it's possible you'll need to iterate over the parsed contents of data.text()
.
var objs = JSON.parse(data.text());
// Use a simple loop like above
malachi54
Updated on July 09, 2022Comments
-
malachi54 almost 2 years
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 usefor...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