Use forcetk to get all object prefix or get object name from object id

Question

I am trying to use forcetk and I want to know if there is a simple way to:

1. Get all object prefixes for all objects present in org

OR

2. Based on an 15 or 18 digit Id get which object does it belong to

Answer 1

You can use describeGlobal to get all of the object prefixes and then put them in a map:

var prefixToName = {};
client.describeGlobal(function(response){
    for (var i = 0; i < response.sobjects.length; i++) {
        var sobject = response.sobjects[i];
        if (sobject.keyPrefix) {
            prefixToName[sobject.keyPrefix] = sobject.name;
        }
    }
});

Then

var accountId = '0015000000VALE3';
console.log(accountId + ' has sobject type ' + prefixToName[accountId.substring(0,3)]);

Will give you

0015000000VALE3 has sobject type Account