JSONitron

JSON transformer for use in data hygene and proxy

Usage

let jsonitron = require('jsonitron');
 
let userTransformer = new jsonitron.Transformer();
userTransformer.use(jsonitron.Factory.renameKey('name', 'full_name'));
userTransformer.use(jsonitron.Factory.upperCase('full_name'));
userTransformer.use(jsonitron.Factory.upperCase('friends.*.name.first'));
userTransformer.use(jsonitron.Factory.upperCase('friends.*.name.last'));
userTransformer.use(jsonitron.Factory.new('friends.*.phone', function (val, key) {
  let match = ((val || '').match(/(^\d{3,3})(\d{3,3})(\d{4,4})$/) || [])
  match.shift();
  this.setVal(match.join('-'));
}));
 
let result = userTransformer.exec({
  name: 'john hof',
  friends: [{
    phone: '1232341234',
    name: {
      first: 'joe',
      last: 'smith'
    }
  }, {
    phone: '2342342345',
    name: {
      first: 'jenny',
      last: 'doe'
    }
  }]
});
 
console.log(result);
// => {
//   full_name: 'JOHN HOF',
//   friends: [{
//     phone: '123-234-1234',
//     name: {
//       first: 'JOE',
//       last: 'SMITH'
//     }
//   }, {
//     phone: '234-234-2345',
//     name: {
//       first: 'JENNY',
//       last: 'DOE'
//     }
//   }]
// }

Key

• Usage
• Transform
  • Constructor
  • .setPath
  • .setName
  • .setAction
  • .exec
• Transform Factory
  • .build
  • .register
  • Predefined
• Transformer
  • Constructor
  • .use
  • .useAll
  • .exec

Transform

Class for creating a reusable transformation

Transform Constructor

• Returns a new Transform object
• Accepts: Object [optional]
  • config.name (String) - Name of the transform
  • config.path (String) - Path to match and perform the action
  • config.params: (Mixed) - Params to be passed to the action in addition to key and value
  • config.action (Function) - Action to be performed

// EXAMPLE ACTION:
//  { user_details.name: 'john hof' }
//       becomes
//  { user_details.full_name: 'JOHN HOF' }
let fooTransform = new jsonitron.Transfrom({
  name: 'foo',
  path: 'user_details.name',
  params: 'foo',
  action: function (value, key, params) {
    this.setVal(value.toUpperCase()); // OR .setValue
    this.setkey('full_name');
  }
});

.setPath

• Set the path on which to perform the action
• Accepts: String
  • Expects: JSON syntax: prop.subProps[0].foo
  • Allows: * as a wildcard: prop.subProps.*.foo

fooTransform.setPath(`prop.subProps.*.foo`);
// Applies to all elements in subProps:
//   {
//     prop: {
//       subProps: [
//         { foo: 'bar' }
//         { foo: 'baz' }
//       ]
//     }
//   }
//
// AND
//   {
//     prop: {
//       subProps: {
//         biz: { foo: 'bar' }
//         faz: { foo: 'baz' }
//       }
//     }
//   }

.setName

• Set the name of the transform
• Accepts: String

fooTransform.setName('fooRenamed');

.setAction

• Set the action to be performed
• Accepts: Function
  • Should accept: (value, key, params) [READ ONLY]
  • this - refers to:
    • this.setKey('String') - update the key name of the property
    • this.setValue - update the value of the propery
    • this.setVal - see this.setValue

fooTransform.setAction(function (value, key, params) {
  this.setVal(value.toUpperCase()); // OR .setValue
  this.setkey('full_name');
});

.exec transform

• Execute the transform on an object
• Accepts: Object
• Returns: (Object) result of the transform

let result = fooTransform.exec({ object: { to: ['transform'] } });

Transform Factory

Utility for generating and accessing transforms

.build

• Build a new transform object
• Accepts:
  • path (String)[required] - path to match
  • action (Function)[required] - action to perform (see Transform object documentation)
  • params (Mixed)[optional] - additional params to pass to the action
  • name (String)[optional] - name of the transform
• Returns: (Object) result of the transform

jsonitron.Factory.build('foo.bar', function (v, k, p) {
  // See Transfrom object documentation
} , { some: 'param' }, 'fooTransform');

.register

• Register a predefined transform
• Accepts:
  • name (String) - unique name of the transform
  • action (Function) - action to perform (see Transform object documentation)

jsonitron.Factory.register('fooAction', function (v, k, p) {
  // See Transfrom object documentation
});
 
jsonitron.Factory.fooAction('foo.bar') // returns new Transform
jsonitron.Factory.createFooAction('foo.bar') // returns new Transform
jsonitron.Factory.buildFooAction('foo.bar') // returns new Transform
jsonitron.Factory.newFooAction('foo.bar') // returns new Transform

Predefined

• Case
  • Value
  • .upperCase(path) - EXAMPLE OUTPUT
  • .camelCas(path)e - exmapleOutput
  • .constantCase(path) - EXAMPLE_OUTPUT
  • .dotCase(path) - example.output
  • .headerCase(path) - Example-Output
  • .lowerCase(path) - example output
  • .lowerFirstCase(path) - eXAMPLE OUTPUT
  • .noCase(path) - example output
  • .paramCase(path) - example-output
  • .pascalCase(path) - ExampleOutput
  • .pathCase(path) - example/output
  • .sentenceCase(path) - Example output
  • .snakeCase(path) - exmaple_output
  • .swapCase(path) - eXAMPLE oUTPUT
  • .titleCase(path) - Example Output
  • .upperCase(path) - EXAMPLE OUTPUT
  • .upperFirstCase(path) - Example output
  • Key
  • .upperCaseKey(path) - EXAMPLE OUTPUT
  • .camelCasKey(path) - exmapleOutput
  • .constantCaseKey(path) - EXAMPLE_OUTPUT
  • .dotCaseKey(path) - example.output
  • .headerCaseKey(path) - Example-Output
  • .lowerCaseKey(path) - example output
  • .lowerFirstCaseKey(path) - eXAMPLE OUTPUT
  • .noCaseKey(path) - example output
  • .paramCaseKey(path) - example-output
  • .pascalCaseKey(path) - ExampleOutput
  • .pathCaseKey(path) - example/output
  • .sentenceCaseKey(path) - Example output
  • .snakeCaseKey(path) - exmaple_output
  • .swapCaseKey(path) - eXAMPLE oUTPUT
  • .titleCaseKey(path) - Example Output
  • .upperCaseKey(path) - EXAMPLE OUTPUT
  • .upperFirstCaseKey(path) - Example output
• Misc
  • .renameKey(path, newName)
  • convert last property in the path to use the new name
  • { test: 'foo '} => renameKey('test', 'bar') => { bar: 'foo' }

Transformer

A thin wrapper to execute a set of transforms

Transformer constructor

• Returns a new Transform object

let transformer = new jsonitron.Transfromer();

.use

• Add a transform to the internal set of transforms
• Accepts:
  • Transform (Function)[required] - transform to be executed

transformer.use(TransformFactory.upperCase('foo.bar'));

.useAll

• Add a set of transforms to the internal set of transforms
• Accepts:
  • Transform (Function)[required] - transform to be executed

transformer.useAll([
  TransformFactory.upperCase('foo.bar'),
  TransformFactory.lowerCase('foo.biz'),
]);

.exec Transformer

• Execute the set of transforms on an object
• Accepts: Object
• Returns: (Object) result of the transforms

let result = transformer.exec({ object: { to: ['transform'] } });

Authors

• John Hofrichter