json-to-fs-structure

json-to-fs-structure

Clean and simple JavaScript project for turning JSON objects into directory structures.

Development

For development, clone into this repository and to install run: yarn install To test run: yarn test

Usage

To use this node module, install it like so: yarn add json-to-fs-structure And (as it's currently intended to be used on the server) usage looks like this on a simple node server:

var express = require('express');
var { jsonToFsStructure } = require('json-to-fs-structure');
var app = express();

app.get('/', function(req, res){
  const options = {
    jsonObject: {
      testArrayField5: [
        { somedir: {} },
        { anotherdir: {} },
        {
          andanotherdir: {
            interiorone: {
              interiortwo: {
                interiorthree: [{ interiorfour: {} }, { interiorfive: {} }]
              }
            }
          }
        }
      ]
    }
  };
  jsonToFsStructure(options);
  res.send("Hello world!");
});

app.listen(3000);

Or if you want to see how it works synchronously (server only returns after it is written to the root directory), your code would look more like this:

var express = require('express');
var { jsonToFsStructure } = require('json-to-fs-structure');
var app = express();

app.get('/', function(req, res){
  const options = {
    jsonObject: {
      testArrayField5: [
        { somedir: {} },
        { anotherdir: {} },
        {
          andanotherdir: {
            interiorone: {
              interiortwo: {
                interiorthree: [{ interiorfour: {} }, { interiorfive: {} }]
              }
            }
          }
        }
      ]
    },
    filePath: ".",
    callback: () => res.send("Hello world!"))
  };
  jsonToFsStructure(options);
});

app.listen(3000);

Both of those examples would leave you with directory trees that look like this:

Executing functions in place

Suppose you want to execute a function for each directory whether it be a terminating (leaf) directory or another directory. The function format is as follows:

const procedure = (newPath, accumulator, obj) => {
  // something that takes the just created directory (relative newPath)
  // and the accumulator (a structure you can provide that continues through each call)
  // and the obj, the value of the nested structure if this is a leaf node it's {}

  // lastly we return the accumulator to persist it
  return accumulator;
}

The corresponding functions for the above executing procedures are: jsonToFsWithLeafFunction, jsonToFsWithNonLeafFunction and jsonToFsWithFunction. So an example usage in a simple express server would look like this:

var express = require('express');
var { jsonToFsWithLeafFunction } = require('json-to-fs-structure');
var app = express();

const procedure = (newPath, accumulator, obj) => {
  accumulator.contextvalue += 2;
  accumulator.paths.push(newPath);
  return accumulator;
};

app.get('/', function(req, res){
  let passByValueContext = {"contextvalue": 1, paths: []};
  const options = {
    jsonObject: {
      testArrayField5: [
        { somedir: {} },
        { anotherdir: {} },
        {
          andanotherdir: {
            interiorone: {
              interiortwo: {
                interiorthree: [{ interiorfour: {} }, { interiorfive: {} }]
              }
            }
          }
        }
      ]
    },
    procedure,
    context: passByValueContext
  };
  jsonToFsWithLeafFunction(options);
  console.log(passByValueContext);
  res.send("Hello world!");
});

app.listen(3000);

What we expect to see in the console when this runs is:

{ contextvalue: 9,
  paths:
   [ './testArrayField5/somedir',
     './testArrayField5/anotherdir',
     './testArrayField5/andanotherdir/interiorone/interiortwo/interiorthree/interiorfour',
     './testArrayField5/andanotherdir/interiorone/interiortwo/interiorthree/interiorfive' ] }

And since our context value is scoped to each request, you will see that for every GET method.