const fs = require('fs');

const json = JSON.parse(fs.readFileSync('blast.txt'));

let count = 0;

let cvar = 'sm_cidr_version';
let cvar_count = {};

Object.keys(json).forEach((key) => {
    if (json[key].hasOwnProperty('rules')) {
        if (json[key].rules.hasOwnProperty(cvar)) {

            let value = json[key].rules[cvar];

            if (cvar_count.hasOwnProperty(value))
                cvar_count[value]++;
            else
                cvar_count[value] = 1;
        }
    }
});

console.log(cvar_count);