How to get the length of array inside the list of array from api response - flutter

Question

This is the api response. I have to get the length of "newslikes" length?

How can i get that. Please help.

{ "sno": 69, "userid": "ram@gmail.com", "postUrl": "[https://uat-marc.s3.ap-south-1.amazonaws.com/news-feed/69_0.jpg@ https://uat-marc.s3.ap-south-1.amazonaws.com/news-feed/69_1.jpg@ https://uat-marc.s3.ap-south-1.amazonaws.com/news-feed/69_2.jpg]", "contentType": "img", "descrip": "jpg or jpeg 3flrs", "dispname": "Ram", "city": "4", "chamberName": "null", "keydesc": "null", "profilepic": "https://uat-marc.s3.ap-south-1.amazonaws.com/profile-images/1274.jpg", "createdBy": "null", "postStatus": "Y", "createdDate": "2022-07-03T11:52:49.000+0000", "newsLikes" : [ { "sno": 472, "nfid": 69, "userid": "newdirector@mailinator.com", "status": "Y", "disName": "prathap s", "disUrl": null, "createdBy": "newdirector@mailinator.com", "createdDate": "2022-07-04T04:54:01.000+0000", "updatedDate": "2022-07-04T04:54:01.000+0000" }, { "sno": 478, "nfid": 69, "userid": "sriram@gmail.com", "status": "Y", "disName": "sr i Ram", "disUrl": "https://uat-marc.s3.ap-south-1.amazonaws.com/profile-images/1284.png", "createdBy": "sriram@gmail.com", "createdDate": "2022-07-04T05:02:13.000+0000", "updatedDate": "2022-07-04T05:02:13.000+0000" }, { "sno": 479, "nfid": 69, "userid": "sriram@gmail.com", "status": "Y", "disName": "sri Ram", "disUrl": "https://uat-marc.s3.ap-south-1.amazonaws.com/profile-images/1284.png", "createdBy": "sriram@gmail.com", "createdDate": "2022-07-04T05:02:13.000+0000", "updatedDate": "2022-07-04T05:02:13.000+0000" }, { "sno": 480, "nfid": 69, "userid": "sriram@gmail.com", "status": "D", "disName": "sri Ram", "disUrl": "https://uat-marc.s3.ap-south-1.amazonaws.com/profile-images/1284.png", "createdBy": "sriram@gmail.com", "createdDate": "2022-07-04T05:02:36.000+0000", "updatedDate": "2022-07-04T05:21:43.000+0000" }, { "sno": 481, "nfid": 69, "userid": "sriram@gmail.com", "status": "Y", "disName": "sri Ram", "disUrl": "https://uat-marc.s3.ap-south-1.amazonaws.com/profile-images/1284.png" , "createdBy": "sriram@gmail.com", "createdDate": "2022-07-04T05:02:36.000+0000", "updatedDate": "2022-07-04T05:02:36.000+0000" }, { "sno": 499, "nfid": 69, "userid": "rajesh@gmail.com", "status": "Y", "disName": "rajesh kumar", "disUrl": null, "createdBy": "rajesh@gmail.com", "createdDate": "2022-07-04T05:48:57.000+0000", "updatedDate": "2022-07-04T05:48:57.000+0000" }, { "sno": 500, "nfid": 69, "userid": "rajesh@gmail.com", "status": "Y", "disName": "rajesh kumar", "disUrl": null, "createdBy": "rajesh@gmail.com", "createdDate": "2022-07-04T05:48:57.000+0000", "updatedDate": "2022-07-04T05:48:57.000+0000" }, { "sno": 501, "nfid": 69, "userid": "rajesh@gmail.com", "status": "Y", "disName": "rajesh kumar", "disUrl": null, "createdBy": "rajesh@gmail.com", "createdDate": "2022-07-04T05:48:57.000+0000", "updatedDate": "2022-07-04T05:48:57.000+0000" } ] },

Answer 1

Firstly your JSON is wrong try with this json.

 { "sno": 69, "userid": "ram@gmail.com", "postUrl": [ "https://uat-marc.s3.ap-south-1.amazonaws.com/news-feed/69_0.jpg", " https://uat-marc.s3.ap-south-1.amazonaws.com/news-feed/69_1.jpg", " https://uat-marc.s3.ap-south-1.amazonaws.com/news-feed/69_2.jpg" ], "contentType": "img", "descrip": "jpg or jpeg 3flrs", "dispname": "Ram", "city": "4", "chamberName": "null", "keydesc": "null", "profilepic": "https://uat-marc.s3.ap-south-1.amazonaws.com/profile-images/1274.jpg", "createdBy": "null", "postStatus": "Y", "createdDate": "2022-07-03T11:52:49.000+0000", "newsLikes": [ { "sno": 472, "nfid": 69, "userid": "newdirector@mailinator.com", "status": "Y", "disName": "prathap s", "disUrl": null, "createdBy": "newdirector@mailinator.com", "createdDate": "2022-07-04T04:54:01.000+0000", "updatedDate": "2022-07-04T04:54:01.000+0000" }, { "sno": 478, "nfid": 69, "userid": "sriram@gmail.com", "status": "Y", "disName": "sri Ram", "disUrl": "https://uat-marc.s3.ap-south-1.amazonaws.com/profile-images/1284.png", "createdBy": "sriram@gmail.com", "createdDate": "2022-07-04T05:02:13.000+0000", "updatedDate": "2022-07-04T05:02:13.000+0000" }, { "sno": 481, "nfid": 69, "userid": "sriram@gmail.com", "status": "Y", "disName": "sri Ram", "disUrl": "https://uat-marc.s3.ap-south-1.amazonaws.com/profile-images/1284.png", "createdBy": "sriram@gmail.com", "createdDate": "2022-07-04T05:02:36.000+0000", "updatedDate": "2022-07-04T05:02:36.000+0000" }, { "sno": 499, "nfid": 69, "userid": "rajesh@gmail.com", "status": "Y", "disName": "rajesh kumar", "disUrl": null, "createdBy": "rajesh@gmail.com", "createdDate": "2022-07-04T05:48:57.000+0000", "updatedDate": "2022-07-04T05:48:57.000+0000" }, { "sno": 500, "nfid": 69, "userid": "rajesh@gmail.com", "status": "Y", "disName": "rajesh kumar", "disUrl": null, "createdBy": "rajesh@gmail.com", "createdDate": "2022-07-04T05:48:57.000+0000", "updatedDate": "2022-07-04T05:48:57.000+0000" }, { "sno": 501, "nfid": 69, "userid": "rajesh@gmail.com", "status": "Y", "disName": "rajesh kumar", "disUrl": null, "createdBy": "rajesh@gmail.com", "createdDate": "2022-07-04T05:48:57.000+0000", "updatedDate": "2022-07-04T05:48:57.000+0000" } ] }

try to create model with this converter https://ashamp.github.io/jsonToDartModel/

then

YourClassName.newsLikes.length

you will get length of newsLikes .

Answer 2

If you have a type defined for the API response and you mapped your API response to the type you can use

data[index].newsLikes.length

Or if you have not defined type, you can use like

 data[index]['newsLikes'].length

Add null check wherever it is required and hope you would have parsed the JSON from JSON string if in case you receive JSON String as the response.