ejson-date

A lightweight (794 bytes) library to add Date support to JSON APIs.

Enables APIs to send database records that contain dates without having to manually transform them.

import { DateJson } from "ejson-date"

const json = DateJson.toJSON({ createdAt: new Date() })
// --> { createdAt: { $date: 1519211811670 } }

const jsonWithDates = DateJson.fromJSON(json)
// --> { createdAt: anInstanceOfADateObject }

Features

• Lightweight: 795 bytes
• JSON: Transform to/from JSON
• String: Transform to/from string (stringify/parse)
• TypeScript: Keeps type integrity through transformations

TypeScript

Keeps type integrity during encode/decode enabling type safety in API calls.

const json = DateJson.toJSON({ createdAt: new Date() })
// --> { createdAt: { $date: 1519211811670 } }
type MyJson = typeof json
// --> type: { createdAt: { $date: number }}

const jsonWithDates = DateJson.fromJSON(json)
// --> { createdAt: anInstanceOfADateObject }
type MyJsonWithDates = typeof jsonWithDates
// --> type: { createdAt: Date }

No $date Key Allowed

The key $date is prohibited in toJSON like in DateJson.toJSON({ $date: 'today' }). This throws the error Object with key $date is invalid.

The design is intentional and is there to prevent confusion. Am I looking at a DateJson object or a plain JSON object with $date in it?