How to convert JSON to YAML in javascript

Question

I want to convert a json string to yaml format in javascript.I am trying my hand on google from last two days didnt found any solution or libraries. There are answers available for java but not for javascript.

Suppose i have json string like this:

{
  "json": [
    "fat and rigid"
  ],
  "yaml": [
    "skinny and flexible"
  ],
  "object": {
    "array": [
      {
        "null_value": null
      },
      {
        "boolean": true
      },
      {
        "integer": 1
      }
    ]
  }
}

conver to yaml:

json:
  - fat and rigid
yaml:
  - skinny and flexible
object:
  array:
    - null_value:
    - boolean: true
    - integer: 1

There is a online converter http://www.json2yaml.com/ , but how to convert to it in javascript.

Answer 1

You can use yaml NPM package.

const YAML = require('yaml');

const jsonObject = {
    version: "1.0.0",
    dependencies: {
        yaml: "^1.10.0"
    },
    package: {
        exclude: [ ".idea/**", ".gitignore" ]
    }
}

const doc = new YAML.Document();
doc.contents = jsonObject;

console.log(doc.toString());

Output

version: 1.0.0
dependencies:
  yaml: ^1.10.0
package:
  exclude:
    - .idea/**
    - .gitignore

Answer 2

Use the 'js-yaml' npm package! That's the one that is officially recognized by yaml.org. (If you want to be extra sure && this post is outdated, go check yaml.org yourself to see which package it recommends.) I initially used 'json2yaml' instead and got strange parsing behavior when converting json (as string) to yaml.

Answer 3

If someone still wants to convert JSON to YAML, you may use this JavaScript library: https://www.npmjs.com/package/json2yaml