depth.js

depth.js

#! /usr/bin/env node
var fs = require("fs")
var files = process.argv.slice(2)
if (!files.length) {
  console.log("USAGE: depth.js file1 [file2 ...]")
}
files.forEach(function(filename) {
  var object = JSON.parse(fs.readFileSync(filename))
  console.log(filename, depth(object, ""))
  function depth(object, path) {
    var max = 0;
    var maxKey = ""
    for (var key in object) {
      if (typeof object == "object" && object.hasOwnProperty(key)) {
        var childDepth = depth(object[key], key)
        var localDepth = childDepth.depth + 1
        if (localDepth > max) {
          max = localDepth
          maxKey = childDepth.key
        }
      }
    }
    return { depth: max, key : path + "." + maxKey }
  }
})

utility for measuring maximum depth of JSON files