JSON

JSON operators

Introduction

Custom operators for converting JSON

Usage

Nabu

When using the Nabu storage engine, JSON operators are included by default.

Memory storage engine

If you are using the memory storage engine the JSON plugin must be configured

import Memory from '@tashmet/memory';
import mingo from '@tashmet/mingo';
import json from '@tashmet/json';

const store = Memory
  .configure({})
  .use(mingo())
  .use(json())
  .bootstrap();

Operators

$jsonToObject

{ $jsonToObject: <expression> }

Convert a JSON string to an object

const input = [
  { json: '{ "foo": "bar" }' }
];
const pipeline: Document[] = [
  { $documents: input },
  { $set: { object: { $jsonToObject: '$json' } } }
];

const doc = await tashmet.db('test').aggregate(pipeline).next();

$objectToJson

{ $objectToJson: <expression> }

Convert an object to a JSON string

const input = [
  { object: { foo: 'bar' } }
];
const pipeline: Document[] = [
  { $documents: input },
  { $set: { json: { $objectToJson: '$object' } } }
];

const doc = await tashmet.db('test').aggregate(pipeline).next();