@jokio/graphql/src/modules/scalars/json/index.ts

High level, pre-configured, GraphQL Server

import { GraphQLScalarType } from 'graphql';
import { Kind } from 'graphql/language';

function identity(value: any) {
	return value;
}

function parseLiteral(ast: any) {
	switch (ast.kind) {
		case Kind.STRING:
		case Kind.BOOLEAN:
			return ast.value;
		case Kind.INT:
		case Kind.FLOAT:
			return parseFloat(ast.value);
		case Kind.OBJECT: {
			const value = Object.create(null);
			ast.fields.forEach((field: any) => {
				value[field.name.value] = parseLiteral(field.value);
			});

			return value;
		}
		case Kind.LIST:
			return ast.values.map(parseLiteral);
		default:
			return null;
	}
}

export default new GraphQLScalarType({
	name: 'JSON',
	description:
	'The `JSON` scalar type represents JSON values as specified by ' +
	'[ECMA-404](http://www.ecma-international.org/' +
	'publications/files/ECMA-ST/ECMA-404.pdf).',
	serialize: identity,
	parseValue: identity,
	parseLiteral,
});