EmptyStringToNullPipe

NestJS pipe for request body string normalization.

import { EmptyStringToNullPipe } from '@querry-kit/nest-util';

Constructor

EmptyStringToNullPipe does not require constructor arguments.

const pipe = new EmptyStringToNullPipe();

transform(value, metadata)

Transforms value only when metadata.type === 'body'.

For body values, the pipe recursively:

• trims non-empty strings
• converts empty or whitespace-only strings to null
• preserves non-string primitive values
• normalizes nested objects and arrays

const pipe = new EmptyStringToNullPipe();

pipe.transform({ name: '  Ada  ', note: '' }, { type: 'body' } as never);

// { name: 'Ada', note: null }

Query parameters, route parameters, and other metadata types are returned unchanged.