O-Mapper

What

Validation and conversion of a given object to another.

Like this:

{
    "first_name": "Toby",
    "last_name": "Flenderson",
    "birth_date": "1971-04-01",
    "job_name": "HR",
    "extra_data": {
        "orders": []
    }
}

to this:

{
    "full_name": "Toby Flenderson",
    "job": "HR",
    "birth_date": new Date("1971-04-01"),
    "orders": []
}

How

const omapper = require('o-mapper');

const schema = { ... };
const input = { ... };

const result = omapper(input, schema);

Schema

Schemas are objects that will dictate what the final object will contain and where to get the values from the source object. Each key from the schema represents a key of the final object.

const schema = {

    // key property specifies what key to look for in the source object
    job: {
        key: 'job_name',
    },

    // when multiple keys are selected, an handler is required to process the multiple values
    full_name: {
        key: ['fist_name', 'last_name'],
        handler: (first, last) => `${first} ${last}`,
    },

    // handlers can also be used for single values
    // the key property can be omitted if it matches the final object
    // a property can be set as required
    birth_date: {
        handler: bd => new Date(bd),
        required: true,
    },

    // dot notation can also be used
    // default values can be set in case property doesn't exist
    orders: {
        key: 'data.orders',
        default: [],
    },
};

License

MIT