@luolapeikko/odata-query-select

Builds a data selector based on $select query values.

Parses OData $select values into an AST and applies field projection to plain JavaScript/TypeScript objects. Supports top-level and nested property selection (for example name,address/city), wildcard selection (*), and duplicate item normalization.

Usage examples

import {createODataSelectPicker} from '@luolapeikko/odata-query-select';

interface Person {
	name: string;
	age: number;
	address?: {city?: string; zip?: string};
}

const personList: Person[] = [
	{name: 'John', age: 30, address: {city: 'Seattle', zip: '98101'}},
	{name: 'Mary', age: 25, address: {city: 'Portland', zip: '97201'}},
];

const selectPicker = createODataSelectPicker<Person>('name,address/city');
console.log(personList.map(selectPicker));
// [{name: 'John', address: {city: 'Seattle'}}, {name: 'Mary', address: {city: 'Portland'}}]

import {applyODataSelect} from '@luolapeikko/odata-query-select';

const handleRequest = (req, res, next) => {
	const dataObject = await getSomeData();
	const querySelect = req.query.$select;
	if (typeof querySelect === 'string') {
		const selectedData = applyODataSelect(querySelect, dataObject);
		res.json(selectedData);
	}
};