我如何循环遍历JSON数据？

Question

I am trying to learn node.js but at some point i got stuck. This is my json input : [ { "FIELD1": "name", "FIELD2": "id"}, { "FIELD1": "abc", "FIELD2": "12"}]

How can i loop through this,i tried 'for' but it didn't work. can any one help ?

Answer 1

You're trying to loop over an array of json objects, so you could just

  for(let i= 0; i < object.length; i++){
        //access your object fields
        console.log(object[i].FIELD1);
        console.log(object[i].FIELD2);
  }

Answer 2

well, first of all you are looping over an array. That you can do.

For looping over a json, you can either get the keys. I believe .keys() .

I also believe you can do for(var x in json){}

Answer 3

Basically you can use 3 opportunities here:

• Array.forEach (shown below)
• usual for loop ( for(let t = 0; t < data.length; t++) { ... } )
• ES7 for of loop ( for(const el of data) { ... } )

Assuming you have such data:

const data = [ { "FIELD1": "name", "FIELD2": "id"}, { "FIELD1": "abc", "FIELD2": "12"}];

You can loop through it:

data.forEach(el => console.log(el));

The one you've tried: for(let prop in obj) is used to iterate through objects, not arrays.