json-refactor

Refactor JSON object structure based on provided rules.

quick start

npm install json-refactor --save

import refactor from 'json-refactor';

const result = refactor(target, rules, clone);

• target: target to be refactored
• rules: rules to refactor
• clone: default false, whether to clone a copy of target. By default, the original target will be modified and return. If true, a new cloned target will be formatted and return, and the original target will not be modified.

rules

The to key to from key hash map.

1. base

target: {a: 1, b: 2}

rules: {aaa: 'a', bbb: 'b'}

result: {aaa: 1, bbb: 2}

2. rules should have the same structure with target, including array

target: [{a: 1, b: 2}, {a: 3, b: 4}, {a: 5, b: 6}]

rules: [{aaa: 'a', bbb: 'b'}]

result: [{aaa: 1, bbb: 2}, {aaa: 3, bbb: 4}, {aaa: 5, bbb: 6}]

3. support . semantic

target: {a: {a: {a: 1}}}

rules: {aaa: 'a.a.a'}

result: {aaa: 1}

4. make a new key, and keep on formatting the new key

target: {a: {a: {a: 1}}}

rules: {aaa: 'a', _aaa: {aaa: 'a', _aaa: {aaa: 'a'}}}

result: {aaa: {aaa: {aaa: 1}}}

5. take an operator to original value

Use | to concat from key and operator, and you can add multiple operators.

target: {a: 1, b: '234', c: '1.22', d: '0.01'}

rules: {aaa: 'a|bool', bbb: 'b|int', ccc: 'c|float', ddd: 'd|int|bool'}

result: {aaa: true, bbb: 234, ccc: 1.22, ddd: false}

api

refactor.set

Set the default config values.

refactor.set({
  keepOnHandling: '_',
  operatorDelimiter: '|'
});

• keepOnHandling: make a new key, and keep on formatting the new key

  • type: string
  • default: _

• operatorDelimiter: delimiter of operators

  • type: string
  • default: |

refactor.register

Register operators.

// register one operator
refactor.register(test, handler);
refactor.register({test, handler});

// register multiple operators
refactor.register([{test1, handler1}, {test2, handler2}, ...]);

• test: to match the operator

  • type: string/RegExp
  • example: int, float, bool, string, /^slice!0!10/

• handler: handle the original value and return a new value

  • type: function
  • example: (value, operator) => newValue
  • parameters: value, operator
    • value: original value to be handled
    • operator: operator matched

built-in operators

1. int

Get an integer value.

2. float

Get a float value.

3. bool

Get a bool value.

4. string

Get a string value.

5. sum

Get a sum value specified by a key of each element, within an array.

format: sum!key

target: {oldKey: [{a: 1, b: 2}, {a: 3, b: 4}, {a: 5, b: 6}]}

rules: {newKey: 'oldKey|sum!a'}

result: {newKey: 9}

6. average

Get an average value specified by a key of each element, within an array.

format: average!key

target: {oldKey: [{a: 1, b: 2}, {a: 3, b: 4}, {a: 5, b: 6}]}

rules: {newKey: 'oldKey|average!a'}

result: {newKey: 3}