Don't recieve thinking from thinking models on api

[qnewphone493]

I am using this code yet I do recieve the reasoning data from any models

const nimRequest = {

  model: nimModel,

  messages: messages,

  temperature: temperature || 0.6,

  max_tokens: max_tokens ||9024,

  stream: stream || false

};

What should I add to the code to receive reasoning data