Javascript Object to Graphql Query

js-object-to-graphql.js

// Source : https://gist.github.com/Azerothian/dc84f009a94579b5bb43#gistcomment-2002977
function isObject(avar) {
    // cosntructor.name tested for `function Animal(){}; var a = new Animal(); isObject(a);` will return true otherwise as it is [Object object]
    return Object.prototype.toString.call(avar) === '[object Object]' && avar.constructor.name === 'Object';
}
function createGqlQuery(obj) {
    let shape = [];
  
    for (let [key, val] of Object.entries(obj))
      shape.push(isObject(val) ? `${key} { ${createGqlQuery(val)} }` : key);

    return shape.join(' ');
}

const SHAPE = {
    id: 'string.isRequired',
    name: 'string.isRequired',
    address: 'string.isRequired',
    creator: {
        displayname: 'string.isRequired',
        id: 'string.isRequired'
    },
    owner: {
        displayname: 'string.isRequired',
        id: 'string.isRequired'
    },
    level0: {
        level1: {
            level2: {
                levelLast: 'bool'
            }
        }
    }
}

console.log(createGqlQuery(SHAPE)); // outputs "id name address creator { displayname id } owner { displayname id } level0 { level1 { level2 { levelLast } } }"