json-schema-empty-strings

Generate empty strings for all JSON-Schema string fields.

There are four different ways in Javsscript / Typescript to represent "no text":

• ""
• null
• undefined
• absence of the corresponding property

In the context of JSON-Schema absence of the corresponding property is widely used to represent absence of strings. Sometimes you might not want that.

For a given schema jsonEmptyStrings() generates an object containing empty strings for all properties of type: string.

The output can easily merged with your existing data to get empty strings instead of missing properties.

import { jsonEmptyStrings } from 'json-schema-empty-strings';
import merge from 'lodash.merge';

const finalData = merge({}, jsonEmptyStrings(schema), inputData);

Iy you have null or undefined values in your data deep-clean them before merging:

import { jsonEmptyStrings } from 'json-schema-empty-strings'
import merge from 'lodash.merge'
import cleanDeep from 'clean-deep'

const finalData = merge({}, jsonEmptyStrings(schema), cleanDeep(inputData, {
    emptyArrays: false,
    emptyObjects: false,
    emptyStrings: false,
  })

See also:

• json-schema-default
• json-schema-empty