It seems the api documentation on github and on jerryscript.net are out of sync. For example: You can find documentaiton for jerry_call here https://github.com/jerryscript-project/jerryscript/blob/master/docs/02.API-REFERENCE.md#jerry_call, but this function is nowhere to be found on https://jerryscript.net/api-reference/. There are other examples as well.