如何将大型 JSON object 转换为 Node.js 中类似于 console.log() 的字符串

Question

I am trying to stringing a large JSON object without displaying all the children. For example my object has about 20 layers of objects in some places.

At first I was using console.log(jsonObject) which output my object perfectly. It would show about 3 layers then if there was an object lower it would display [object Object] .

I am trying to get this same effect without logging the result to the console but instead to a string.

I searched for anyone trying to do this, and there's a chance I just didn't know the correct search terms but I found nothing. I also looked for libraries that might handle this with no luck. I was thinking I could rewrite the JSON.stringify() but it seemed like there should be an easier way.

Thanks for reading!

Answer 1

You can accomplish that by using the inspect method of the util standard library ( util documentation ). That's actually what console.log uses internally, with the option depth set to 2 .

const util = require('util');

const json_object = {
   "name": "StackOverflow",
   "properties":{
      "url":"https://stackoverflow.com/questions/67029935",
      "users":{
         "name":"Matt Vine",
         "stats":{
            "reputation": 51,
            "badges": 11
         }
      }
   }
};    

let string = util.inspect(json_object, {depth: 2})

This will produce the following string:

{ name: 'StackOverflow',
  properties:
   { url: 'https://stackoverflow.com/questions/67029935',
     users: { name: 'Matt Vine', stats: [Object] } } }

---

If you want to keep the "visual" structure of the object you can set the compact option to false .

let string = util.inspect(json_object, {depth: 2, compact: false})

Gives us:

{
  name: 'StackOverflow',
  properties: {
    url: 'https://stackoverflow.com/questions/67029935',
    users: {
      name: 'Matt Vine',
      stats: [Object]
    }
  }
}