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JavaScript to flatten nested JSON object based on key value

mohammadsalmanfaris
March 11, 2023
65 views
0 votes
2 Answers

Any suggestions on how to update below JSON object as expected one in Javascript?

Have been trying to flatten JSON object based on JSON key,

..outer_component[x] contains section{} then moved to outer_component[x].outer_body.outer_component[x]
..outer_component[x] contains outer_body{} then keep on iterate till it reaches section{} and move outer_component[x].outer_body.outer_component[x]

Received JSON Object:

{
  "document": {
    "outer_component": [
      {
        "outer_body": {
          "outer_component": [
            {
              "outer_body": {
                "outer_component": [
                  {
                    "section": {
                      "id": [
                        {
                          "root": "INNER_11"
                        }
                      ]
                    }
                  },
                  {
                    "section": {
                      "id": [
                        {
                          "root": "INNER_12"
                        }
                      ]
                    }
                  }
                ]
              }
            },
            {
              "outer_body": {
                "outer_component": [
                  {
                    "section": {
                      "id": [
                        {
                          "root": "INNER_21"
                        }
                      ]
                    }
                  },
                  {
                    "section": {
                      "id": [
                        {
                          "root": "INNER_22"
                        }
                      ]
                    }
                  }
                ]
              }
            }
          ]
        }
      },
      {
        "outer_body": {
          "outer_component": [
            {
              "outer_body": {
                "outer_component": [
                  {
                    "outer_body": {
                      "outer_component": [
                        {
                          "outer_body": {
                            "outer_component": [
                              {
                                "section": {
                                  "id": [
                                    {
                                      "root": "INNER_31"
                                    }
                                  ]
                                }
                              },
                              {
                                "section": {
                                  "id": [
                                    {
                                      "root": "INNER_32"
                                    }
                                  ]
                                }
                              }
                            ]
                          }
                        },
                        {
                          "outer_body": {
                            "outer_component": [
                              {
                                "section": {
                                  "id": [
                                    {
                                      "root": "INNER_33"
                                    }
                                  ]
                                }
                              },
                              {
                                "section": {
                                  "id": [
                                    {
                                      "root": "INNER_34"
                                    }
                                  ]
                                }
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            }
          ]
        }
      }
    ]
  }
}

Expected Output:

{
    "document": {
        "outer_component": [{
            "section": {
                "id": [{
                    "root": "INNER_11"
                }]
            }
        }, {
            "section": {
                "id": [{
                    "root": "INNER_12"
                }]
            }
        }, {
            "section": {
                "id": [{
                    "root": "INNER_21"
                }]
            }
        }, {
            "section": {
                "id": [{
                    "root": "INNER_22"
                }]
            }
        }, {
            "section": {
                "id": [{
                    "root": "INNER_31"
                }]
            }
        }, {
            "section": {
                "id": [{
                    "root": "INNER_32"
                }]
            }
        }, {
            "section": {
                "id": [{
                    "root": "INNER_33"
                }]
            }
        }, {
            "section": {
                "id": [{
                    "root": "INNER_34"
                }]
            }
        }]
    }
}

Answers

Chosen as BEST ANSWER

var doc_obj = {
  "document": {
    "outer_component": [
      {
        "outer_body": {
          "outer_component": [
            {
              "outer_body": {
                "outer_component": [
                  {
                    "section": {
                      "id": [
                        {
                          "root": "INNER_11"
                        }
                      ]
                    }
                  },
                  {
                    "section": {
                      "id": [
                        {
                          "root": "INNER_12"
                        }
                      ]
                    }
                  }
                ]
              }
            },
            {
              "outer_body": {
                "outer_component": [
                  {
                    "section": {
                      "id": [
                        {
                          "root": "INNER_21"
                        }
                      ]
                    }
                  },
                  {
                    "section": {
                      "id": [
                        {
                          "root": "INNER_22"
                        }
                      ]
                    }
                  }
                ]
              }
            }
          ]
        }
      },
      {
        "outer_body": {
          "outer_component": [
            {
              "outer_body": {
                "outer_component": [
                  {
                    "outer_body": {
                      "outer_component": [
                        {
                          "outer_body": {
                            "outer_component": [
                              {
                                "section": {
                                  "id": [
                                    {
                                      "root": "INNER_31"
                                    }
                                  ]
                                }
                              },
                              {
                                "section": {
                                  "id": [
                                    {
                                      "root": "INNER_32"
                                    }
                                  ]
                                }
                              }
                            ]
                          }
                        },
                        {
                          "outer_body": {
                            "outer_component": [
                              {
                                "section": {
                                  "id": [
                                    {
                                      "root": "INNER_33"
                                    }
                                  ]
                                }
                              },
                              {
                                "section": {
                                  "id": [
                                    {
                                      "root": "INNER_34"
                                    }
                                  ]
                                }
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            }
          ]
        }
      }
    ]
  }
}

//Dynamic Components
var dyn_component = dynamic_document(
    doc_obj,
    "section", 
    []
)

//Assigning constructed Dynamic Components
doc_obj["document"]["dyn_component"] = dyn_component

//Delete Outer Component
delete doc_obj["document"]["outer_component"]

console.log(JSON.stringify(doc_obj))

/*
Function: To dynamically fetch component's section
*/
function dynamic_document(
    doc, req_component, sections
) {
    if (doc != null) {
        if (Array.isArray(doc)) {
            doc.forEach((arrayItem) => {
                dynamic_document(arrayItem, req_component, sections);
            });
        } else if (typeof doc == 'object') {
            Object.keys(doc).forEach((key) => {
                if (key == req_component) {
                    sections.push(doc);
                } else {
                    dynamic_document(doc[key], req_component, sections);
                }
            });
        }
    }

    return sections;
}

(Edit)

I totally agree with other users comments but you can also give a try to below code,

  const result = {
  document: {
    outer_component: inputJSON.document.outer_component.map((outerComponent) => {
      return {
        outer_body: {
          outer_component: outerComponent.outer_body.outer_component.reduce(
            (acc, innerComponent) => {
              const sections = innerComponent.outer_body
                ? innerComponent.outer_body.outer_component.reduce(
                    (acc, sectionComponent) => {
                      if (sectionComponent.section) {
                        acc.push(sectionComponent.section);
                      }
                      return acc;
                    },
                    []
                  )
                : [];

              return [...acc, ...sections];
            },
            []
          ),
        },
      };
    }),
  },
};

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