如何使用特定时间跨度的速率限制进行异步API调用？

I am working on project in which I have to make almost 500+ calls in one go from my NodeJS server to third party server. The problem is that third party server has a limit of maximum 50 calls in a second. Can you please help me to implement the logic for making only specified number of calls in one second. The technology/language used in my project is NodeJS with HapiJS framework.I am working on project in which I have to make