Understanding query in app functions

Hello I am quite new to this tool. I am trying to intake a query to perform a search in the atlas app, but am not sure why my code won’t understand the queries given. I am quite new to programming so any help with details would be greatly appreciated

// This function is the endpoint’s request handler.
exports = async function(payload, response) {

    query = JSON.stringify(payload.query); //prints out fine
    console.log(payload.query.type); //prints out undefined [object Object]
      //prints "message":"Cannot access member 'type' of undefined","name":"TypeError"}
    const collection = context.services.get("mongodb-atlas").db("portfolio").collection("blogdatas");
    let postList = await collection.find().toArray();

    postList.forEach(blogdata => {
      blogdata._id = blogdata._id.toString();

    let responseData = {
        blogdatas: postList,
        totalNum: postList.length.toString()

return responseData;

console.log(payload.query); // returns prints out undefined [object Object]