How to access first element of JSON object array?
To answer your titular question, you use [0]
to access the first element, but as it stands mandrill_events
contains a string not an array, so mandrill_events[0]
will just get you the first character, '['.
So either correct your source to:
var req = { mandrill_events: [{"event":"inbound","ts":1426249238}] };
and then req.mandrill_events[0]
, or if you're stuck with it being a string, parse the JSON the string contains:
var req = { mandrill_events: '[{"event":"inbound","ts":1426249238}]' };
var mandrill_events = JSON.parse(req.mandrill_events);
var result = mandrill_events[0];
How do I access first element of JSON object array that is in another JSON object array?
Some entries in itemList
may not have images, which would result in the error you are seeing. To account for such entries, we can use conditional property access.
Try item.images[0]?.imageData
in the render, this will short-circuit the execution when images[0]
does not exist.
This answer initially asked for JSON.parse(itemList)
which is what the top comment is referring to. This was not the issue OP was experiencing.
How to get only 1st element of JSON data?
Assuming that you have array of objects
var arr = [{ id:"1", price:"130000.0", user:55, }, { id:"2", price:"140000.0", user:55, }]
console.log(arr[0].price)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Gatling : get the first element of the first object in a JSON Array
This can be done in a few steps.
- At the first need to extract only json and change response body.
- And then you can use simple
jsonPath
and work with json
For change - use transformResponse
where extract json string and remove break lines and set as new response body
http("...")
.get("...")
.transformResponse { (response, _) =>
val json = response.body.string match {
case s"""<div id="DATA--DECL-DATA">${json}</div>""" => json.replaceAll("\n", "")
}
response.copy(body = new StringResponseBody(json, response.body.charset))
}
.check(jsonPath("$...").find.saveAs("..."))
Extract first element from JSON
Deserialize to List<dynamic>
, then read the properties of its first element.
//using Newtonsoft.Json;
var input = @"[{""unique_id"":55,""action_name"":""INSERT"",""start_date"":""2018-06-11T16:00:00"",""end_date"":""2018-06-11T17:00:00""},""1sddsd"",""my_channel""]";
var output = JsonConvert.DeserializeObject<List<dynamic>>(input);
Console.WriteLine(output[0].unique_id);
Output:
55
DotNetFiddle
Access first element of json array
Use Object.entries to iterate on the errors and fetch the message property
const obj = { "errors": { "product_name": { "message": "Product name is required", "name": "ValidatorError" }, "category": { "message": "Category is required", "name": "ValidatorError"
} }};
const [,value] = Object.entries(obj.errors)[0];console.log(value.message);
Fetch first element in JSON with Swift
I recommend using a package like SwiftyJSON to work with JSON in Swift. You can add it via Swift Package Manager or CocoaPods, whichever you prefer.
Supposing to have this JSON string:
let json = "[{\"id\" : 0, \"text\" : \"hello\"},{\"id\" : 1, \"text\" : \"hi\"}]"
You can parse it as shown, and then retrieve and print to console the first item:
if let data = json.data(using: .utf8) {
if let json = try? JSON(data: data) {
print(json[0])
}
}
This will print on the console as:
{
"text" : "hello",
"id" : 0
}
Remember to import SwiftyJSON
at the top of the swift file
How to print only first element from JSON Array in ReactJs?
you are using {PostData.map((group, index)=>{ return <p>{group.Name}</p>
, since you are using map
here PostData[0].Name
will throw error inside map()
, because you are iterating array with map()
.
Since you only need first item, you can simply use <p>PostData[0].Name</p>
var data = [{"ID": 1,"Name" :"David",}, {"ID": 2,"Name" :"Antony",}];
console.log(data[0].Name)
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