Javascript Deep Change Key Case

deepChangeKeyCase.js

// deeply changes the case of object keys, including in sub arrays of objects
const _ = require('lodash');

function deepChangeKeyCase(value, fn) {
  if (Array.isArray(value)) {
    return value.map(v => deepChangeKeyCase(v, fn));
  } else if (_.isPlainObject(value)) {
    return Object.entries(value).reduce((acc, [k, v]) => {
      acc[fn(k)] = deepChangeKeyCase(v, fn);
      return acc;
    }, {});
  }
  return value;
}

// example usage

function camelCaseObj(value) {
  return deepChangeKeyCase(value, _.camelCase);
}

function snakeCaseObj(value) {
  return deepChangeKeyCase(value, _.snakeCase);
}

mixin.js

// or as a lodash mixin

_.mixin({
  deepChangeKeyCase: (value, fn) => {
    if (_.isArray(value)) {
      return value.map(v => _.deepChangeKeyCase(v, fn));
    } else if (_.isPlainObject(value)) {
      return Object.entries(value).reduce((acc, [k, v]) => {
        acc[fn(k)] = _.deepChangeKeyCase(v, fn);
        return acc;
      }, {});
    }
    return value;
  },
});

// example usage

_.deepChangeKeyCase(myObj, _.snakeCase)