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Status](https://travis-ci.org/ohager/magic-mapper.svg?branch=master)](https://travis-ci.org/ohager/magic-mapper)\n[![codecov](https://codecov.io/gh/ohager/magic-mapper/branch/master/graph/badge.svg)](https://codecov.io/gh/ohager/magic-mapper)\n\n# ✨ magic-mapper \nMinimalistic, flexible and easy-to-use JSON mapper 🍰 🍭 🎉 \n\n``npm install magic-mapper --save``\n\n``yarn add magic-mapper``\n\n\nThis tiny library helps you to map one JSON object into another.\nIts basic features are:\n\n- selective property transformations\n- exclusive property selection\n- global property and value transformation\n\n## Selective Property Transformation\n \nIf using a schema you can define how to transform object properties selectively, e.g.\n\n```javascript\n\nconst originalObject = {\n\tid : 1,\n\tname: 'John',\n\tlastName: 'Doe',\n\tbirthDate: '1996-03-27T17:03:02Z'\n}\n\nconst mapper = new MagicMapper();\nconst mappedObject = mapper.map(originalObject, {\n\t    birthDate: date =\u003e moment(date).locale('de').format('LLLL')\n    })\n/* \nmappedobject = {\n\tid : 1,\n\tname: 'John',\n\tlastName: 'Doe',\n\tbirthDate: 'Mittwoch, 27. März 1996 14:03'\n}\n */\n    \n```\n\n\n## Exclusive Property Selection\n \nPer default, _all_ properties are mapped, but you may want to select only a subset of the properties.\n\n```javascript\n\nconst originalObject = {\n\tid : 1,\n\tname: 'John',\n\tlastName: 'Doe',\n\tbirthDate: '1996-03-27T17:03:02Z'\n}\n\nconst mapper = new MagicMapper({exclusive: true}); //\u003c set exclusive flag \nconst mappedObject = mapper.map(originalObject, {\n\t    birthDate: date =\u003e moment(date).locale('de').format('LLLL')\n    })\n/* \nmappedobject = {\n\tbirthDate: 'Mittwoch, 27. März 1996 14:03'\n}\n */\n    \n```\n\n## Global Property and Value Transformation\n \nSometimes, you want to apply some transformations for _all_ properties. You can either use a global \ntransformation function for the property values, or even for the property names itself.\n\n```javascript\n\nconst originalObject = {\n\tid : 1,\n\tname: 'John',\n\tlastName: 'Doe',\n\tbirthDate: '1996-03-27T17:03:02Z'\n}\n\nconst mapper = new MagicMapper({\n    propertyTransform: propertyName =\u003e propertyName[0].toUpperCase() + propertyName.substr(1),\n    valueTransform: value =\u003e typeof value === 'string' ? value.toUpperCase() : value\n});  \n\nconst mappedObject = mapper.map(originalObject, {\n\t    birthDate: date =\u003e moment(date).locale('de').format('LLLL')\n    })\n/* \nmappedobject = {\n\tId : 1,\n\tName: 'JOHN',\n\tLastName: 'DOE',\n\tBirthDate: 'Mittwoch, 27. März 1996 14:03'\n}\n*/    \n```\n\n# Advanced Mapping \n\n## Mapping Schema\n\nThe schema is used for two purposes,\n\n- Define exclusive mapping\n- Define property transformations\n \n\u003e ☠ When used for exclusive mapping a schema is mandatory. \n\nA schema is just a JSON object, that should match structurally to the input object.\nThe values describe how to map the related property. Following value types are possible\n  \n  1. Function - use a _fn(value)_ or _(v) =\u003e {...}_  to transform the value into something new\n  2. Fixed Value - to use the value directly\n  3. MagicMapper.Direct - a symbol to express that original value shall be used \n     -\u003e when using _options.exclusive=false_ the direct mapping is applied automatically for _all_ properties, \n     except the schema says something different. \n   \n\u003e ☠ When using global property transformation, use the transformed property names instead.\n\n### Schema Example\n\n```javascript\nconst originalObject = {\n\tid : 1,\n\tname: 'John',\n\tlastName: 'Doe',\n\tbirthDate: '1996-03-27T17:03:02Z'\n}\n\nconst mapper = new MagicMapper(); //\u003c implicitely exclusive=false, no global transformation \nconst mappedObject = mapper.map(originalObject, {\n        id: null, // maps always 'null'\n        name: MagicMapper.Direct, // uses original value        \n\t    birthDate: date =\u003e moment(date).locale('de').format('LLLL') // transforms date\n    })\n/* \nmappedobject = {\n    id: null,\n    name: 'John',\n    lastName: 'Doe' //\u003c was mapped implicitely\n\tbirthDate: 'Mittwoch, 27. März 1996 14:03'\n}\n*/\n```\n\n## Mapping Nested Objects\n\nMapping nested objects is straightforward. Just define a nested schema conforming your needs.  \n\n### Example\n```javascript\nconst originalObject = {\n    id : 1,\n    name: 'John',\n    lastName: 'Doe',\n    birthDate: '1996-03-27T17:03:02Z',\n    father: {\n        id : 1,\n        name: 'John Sr.',\n        lastName: 'Doe',\n        birthDate: '1956-01-02T14:56:20Z',\n    }\n}\n\n\nconst toGermanDate = date =\u003e moment(date).locale('de').format('LLLL');\n\nconst mapper = new MagicMapper();\nconst mappedObject = mapper.map(originalObject, {\n    birthDate : toGermanDate,\n    father: { \n    \tbirthDate: toGermanDate \n    } // nested mapping\n})\n```\n \n### Example with different mappers\n\nYou can also combine mapping functions to map nested objects with different mappers\n\n```javascript\nconst originalObject = {\n    id : 1,\n    name: 'John',\n    lastName: 'Doe',\n    birthDate: '1996-03-27T17:03:02Z',\n    father: {\n        id : 1,\n        name: 'John Sr.',\n        lastName: 'Doe',\n        birthDate: '1956-01-02T14:56:20Z',\n    }\n}\n\nconst toGermanDate = date =\u003e moment(date).locale('de').format('LLLL');\n\nconst mapper = new MagicMapper();\nconst fatherMapper = new MagicMapper({exclusive:true});\n\nconst mappedObject = mapper.map(originalObject, {\n    birthDate : toGermanDate,\n    father: f =\u003e fatherMapper.map(f, {\n    \tname: MagicMapper.Direct,\n    \tlastName : MagicMapper.Direct\n    })\n})\n```\n \n## Mapping Arrays\n\nArrays can be mapped as it were normal objects. \nIf the initial object is an Array, the mapped result will be an Array, too.\n\n```javascript\n\nconst originalObject = [ {a:1},{a:2} ]\nconst mapper = new MagicMapper();\nconst mappedObject = mapper.map(originalObject, {\n\ta : a =\u003e a * 2\n})\n\n/*\nmappedObject = [{a:2},{a:4}]\n*/\n\n\nIf you want to transform the arrays values you can simply do this:\n\n```javascript\n\nconst originalObject = {\n\tvalues : [ 1,2,3 ]\n}\n\nconst mapper = new MagicMapper();\nconst mappedObject = mapper.map(originalObject, {\n\tvalues : a =\u003e a.map( v =\u003e v*2 )\n})\n\n/*\nmappedObject = {\n    values: [2,4,6]\n}\n*/\n\n```","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fohager%2Fmagic-mapper","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fohager%2Fmagic-mapper","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fohager%2Fmagic-mapper/lists"}