Cloud Firestore(REST API使える)

Googleのクラウド型のデータベース。

https://firebase.google.com/docs/firestore/use-rest-api?hl=ja

詳しいAPIのリファレンスはこっち

https://firebase.google.com/docs/firestore/reference/rest/?hl=ja

↓こんなノリ

POST https://firestore.googleapis.com/v1beta1/{database=projects/*/databases/*}/documents:write

JSON representation
{ "streamId": string, "writes": [ { object(Write) } ], "streamToken": string, "labels": { string: string, ... } }