I was able to use the code in this answer to access a value in a JSON string posted to the server.
If the server gets {"MyKey":"My Value"} then the value for "MyKey" can be accessed with request.body.MyKey.
But the JSON strings that get sent to my server look like this:
[{"id":"1","name":"Aaa"},{"id":"2","name":"Bbb"}]
I could not find a way to access anything in that. How do you do it?
request.body is a standard JavaScript object and in your case a vanilla JavaScript array. You would just handle request.body like you would any JavaScript Array object. e.g.
app.post('/', function(request, response){
var users = request.body;
console.log(users.length); // the length of the array
var firstUser = users[0]; // access first element in array
console.log(firstUser.name); // log the name
users.forEach(function(item) { console.log(item) }); // iterate the array logging each item
...