如何通过nodejs api调用获取数组object值

Question

Trying to get value from nodejs api call but i am getting like [object Object] So How to get values from an array object?

product.component.ts:

 this.sendDatatoInsertDb(this.selectedProduct.replace(/\s/g,''),JSON.stringify(this.registerForm.value));

 sendDatatoInsertDb(collection,collectionData) { 
    this.adminService.insertDataintoDb(collection,collectionData).subscribe(
      res => {  },
      err => {  console.log(err); }
    ); 
  }

this.registerForm.value is like

{
        "p_id": "C5",
        "product_name": "name",
        "product_weight": "250gm"

}

admin.service.ts:

 insertDataintoDb(collection,insertData){
    return this.http.get(environment.apiBaseUrl + '/insertData?collection='+collection+'&collectionData='+insertData);
  }

product.controller.js:

module.exports.insertData = (req, res, next) => { 
    let collectionName = req.query.collection; 
    let collectionData = req.query.collectionData;
        console.log(collectionData); //Getting [object Object]
        console.log(collectionData.p_id); //Getting undefined
        console.log(collectionData.product_name); //Getting undefined
        console.log(collectionData.product_weight);  //Getting undefined
}

Answer 1

You have to parse the string to get your object back using JSON.parse.

module.exports.insertData = (req, res, next) => { 
    let collectionName = req.query.collection; 
    let collectionData = req.query.collectionData;
    let collectionDataJSON = JSON.parse(collectionData);
    console.log(collectionDataJSON.p_id);

}