javascript json iteration to get key and value

Question

I am trying to iterate the json below, I have got this as an output of an astify of sql parser. Now i want to validate the column type with a DB schema that i have.

{
  "with": null,
  "type": "select",
  "options": null,
  "distinct": null,
  "columns": "*",
  "from": [
    {
      "db": null,
      "table": "TABLE_1",
      "as": null
    }
  ],
  "where": {
    "type": "binary_expr",
    "operator": "AND",
    "left": {
      "type": "binary_expr",
      "operator": "AND",
      "left": {
        "type": "binary_expr",
        "operator": "=",
        "left": {
          "type": "column_ref",
          "table": null,
          "column": "COLUMN_1"
        },
        "right": {
          "type": "string",
          "value": "NORM"
        }
      },
      "right": {
        "type": "binary_expr",
        "operator": "IN",
        "left": {
          "type": "column_ref",
          "table": null,
          "column": "COLUMN_2"
        },
        "right": {
          "type": "expr_list",
          "value": [
            {
              "type": "string",
              "value": "11"
            },
            {
              "type": "string",
              "value": "12"
            },
            {
              "type": "string",
              "value": "13"
            },
            {
              "type": "string",
              "value": "14"
            },
            {
              "type": "string",
              "value": "15"
            },
            {
              "type": "string",
              "value": "16"
            },
            {
              "type": "string",
              "value": "17"
            },
            {
              "type": "string",
              "value": "18"
            },
            {
              "type": "string",
              "value": "42"
            },
            {
              "type": "string",
              "value": "43"
            },
            {
              "type": "string",
              "value": "44"
            },
            {
              "type": "string",
              "value": "45"
            },
            {
              "type": "string",
              "value": "101"
            },
            {
              "type": "string",
              "value": "102"
            },
            {
              "type": "string",
              "value": "103"
            },
            {
              "type": "string",
              "value": "104"
            },
            {
              "type": "string",
              "value": "128"
            },
            {
              "type": "string",
              "value": "129"
            },
            {
              "type": "string",
              "value": "130"
            },
            {
              "type": "string",
              "value": "131"
            },
            {
              "type": "string",
              "value": "159"
            }
          ]
        }
      }
    },
    "right": {
      "type": "binary_expr",
      "operator": "OR",
      "left": {
        "type": "binary_expr",
        "operator": "IS NOT",
        "left": {
          "type": "column_ref",
          "table": null,
          "column": "COLUMN_3"
        },
        "right": {
          "type": "null",
          "value": null
        }
      },
      "right": {
        "type": "binary_expr",
        "operator": "=",
        "left": {
          "type": "column_ref",
          "table": null,
          "column": "COLUMN_4"
        },
        "right": {
          "type": "number",
          "value": 1
        }
      },
      "parentheses": true
    }
  },
  "groupby": null,
  "having": null,
  "orderby": null,
  "limit": null
}

Can you please help me get an output like which will help me identify the column and its type whether its string or not. Basically i need to validate the query whether its mapped against the correct data type while using a var condition.

Output like:

map = <key,value>
<Column_1, String>
<Column_2, String>
<Column_3, INT>
etc.

Answer 1

Parse the JSON into an object using JSON.parse(), then iterate through them while checking if the value is JSON or not.

Check if the value is JSON by using catch on JSON.parse()

To get the object keys for iteration, Use var keys = Object.keys();

Answer 2

@Suzy, please check below code for your reference:

var arr = {
  "with": null,
  "type": "select",
  "options": null,
  "distinct": null,
  "columns": "*",
  "from": [
    {
      "db": null,
      "table": "TABLE_1",
      "as": null
    }
  ],
  "where": {
    "type": "binary_expr",
    "operator": "AND",
    "left": {
      "type": "binary_expr",
      "operator": "AND",
      "left": {
        "type": "binary_expr",
        "operator": "=",
        "left": {
          "type": "column_ref",
          "table": null,
          "column": "COLUMN_1"
        },
        "right": {
          "type": "string",
          "value": "NORM"
        }
      },
      "right": {
        "type": "binary_expr",
        "operator": "IN",
        "left": {
          "type": "column_ref",
          "table": null,
          "column": "COLUMN_2"
        },
        "right": {
          "type": "expr_list",
          "value": [
            {
              "type": "string",
              "value": "11"
            },
            {
              "type": "string",
              "value": "12"
            },
            {
              "type": "string",
              "value": "13"
            },
            {
              "type": "string",
              "value": "14"
            },
            {
              "type": "string",
              "value": "15"
            },
            {
              "type": "string",
              "value": "16"
            },
            {
              "type": "string",
              "value": "17"
            },
            {
              "type": "string",
              "value": "18"
            },
            {
              "type": "string",
              "value": "42"
            },
            {
              "type": "string",
              "value": "43"
            },
            {
              "type": "string",
              "value": "44"
            },
            {
              "type": "string",
              "value": "45"
            },
            {
              "type": "string",
              "value": "101"
            },
            {
              "type": "string",
              "value": "102"
            },
            {
              "type": "string",
              "value": "103"
            },
            {
              "type": "string",
              "value": "104"
            },
            {
              "type": "string",
              "value": "128"
            },
            {
              "type": "string",
              "value": "129"
            },
            {
              "type": "string",
              "value": "130"
            },
            {
              "type": "string",
              "value": "131"
            },
            {
              "type": "string",
              "value": "159"
            }
          ]
        }
      }
    },
    "right": {
      "type": "binary_expr",
      "operator": "OR",
      "left": {
        "type": "binary_expr",
        "operator": "IS NOT",
        "left": {
          "type": "column_ref",
          "table": null,
          "column": "COLUMN_3"
        },
        "right": {
          "type": "null",
          "value": null
        }
      },
      "right": {
        "type": "binary_expr",
        "operator": "=",
        "left": {
          "type": "column_ref",
          "table": null,
          "column": "COLUMN_4"
        },
        "right": {
          "type": "number",
          "value": 1
        }
      },
      "parentheses": true
    }
  },
  "groupby": null,
  "having": null,
  "orderby": null,
  "limit": null
};

function findProp(obj, key, out) {
    var i,
        proto = Object.prototype,
        ts = proto.toString,
        hasOwn = proto.hasOwnProperty.bind(obj);

    if ('[object Array]' !== ts.call(out)) out = [];

    for (i in obj) {
        if (hasOwn(i)) {
            if (i === key) {
                out.push(obj[i]);
            } else if ('[object Array]' === ts.call(obj[i]) || '[object Object]' === ts.call(obj[i])) {
                findProp(obj[i], key, out);
            }
        }
    }

    return out;
}

console.log(findProp(arr, "column"));