For AI agents: llms.txt is a short guide that sends you to the rules your problem needs, and rules.json holds every rule of this playbook as JSON.

Cost

Source available. The SSPL lets you read the code, but the OSI has not approved it.

How to do it

Every MongoDB Community Server release since 16 October 2018 is under the SSPL. MongoDB's own licence page says the OSI has not approved it, so it fails the licence test. Most business data is orders, customers and invoices, which are tables with relations. PostgreSQL stores those with constraints and also keeps JSON documents in jsonb columns. Choose something else when an existing MongoDB system works, and keep it with a tested export to JSON. It fails Keep an open licence or a way out.

Examples

Using these examples: they show one way to follow this rule. Keep the behaviour and the check, not the syntax. Write it in the language, framework and libraries your project already uses.

SQL example

CREATE TABLE events (
  id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  payload jsonb NOT NULL
);
CREATE INDEX events_payload_idx ON events USING GIN (payload);

JavaScript example

const { rows } = await pool.query(`SELECT payload FROM events WHERE payload @> $1`, [{ type: 'order.paid' }]);

Python example

from psycopg.types.json import Jsonb

rows = conn.execute("SELECT payload FROM events WHERE payload @> %s", [Jsonb({"type": "order.paid"})]).fetchall()

Sources

• MongoDB SSPL FAQ

Related rules

• Keep an open licence or a way out in Software choices