Snippet :
const options = new RequestOptions({ headers: headers });
let myArray;
myArray = [{ "subfolder_name": subfolder, "file_upload": file }];
let formData: FormData = new FormData();
formData.append("folder_name",folder );
formData.append("counselor",myArray );
The result is counselor: [Object Object]
FormData is a tool used to organize key-value pairs without support for nested structures. However, you can indicate nesting by structuring the keys accordingly:
let array1 = [{ "subfolder_name": "foo", "file_upload": "bar" }];
let formData = new FormData();
formData.append('counselor[0].subfolder_name', array1[0].subfolder_name );
formData.append('counselor[0].file_upload', array1[0].file_upload );
for (let pair of formData.entries()) {
console.log(pair[0] + ': ' + pair[1]);
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