Cloud Firestore

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Overview

Client-mode REST API connectors for Firebase: write device state, append events, and query history in the Realtime Database, and upsert, merge, and query Cloud Firestore documents from MQTT. This is one of the templates in the Firebase Realtime Database and Cloud Firestore REST API app (firebase-realtime-database-and-cloud-firestore). Deploy it alongside the other connectors of that app when they depend on each other (for example a token connector plus an API connector). See Firebase Realtime Database and Cloud Firestore for the package overview.

Auth

Bearer {value.json.access_token} on both connectors. RTDB: Google OAuth2 SA token (userinfo.email + firebase.database); alt ?access_token= or Firebase ID token via ?auth=. Firestore: Google OAuth2 SA token (roles/datastore.user) or Firebase ID token (rules apply). Hub secret FIREBASE_ACCESS_TOKEN. Auth headers used by the template: Authorization: Bearer {value.json.access_token}.

Template parameters

Placeholder	Type	Description	Required
`RouteName`	string	Name of the Cloud Firestore connector	no
`BaseUrl`	string	Cloud Firestore base URL without trailing slash (e.g. https://firestore.googleapis.com)	yes

BASE_ADDRESS default: https://firestore.googleapis.com.

Events

Event	Method	Endpoint	Request topic	Response topic	Payload fields
`UpsertDocument`	PATCH	`/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.document_path}`	`data/firebase/firestore/document/upsert`	`data/firebase/firestore/document/upsert/response`	`access_token`, `document`, `document_path`, `project_id`
`MergeFields`	PATCH	`/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.document_path}?{value.json.update_mask}`	`data/firebase/firestore/document/merge`	`data/firebase/firestore/document/merge/response`	`access_token`, `document`, `document_path`, `project_id`, `update_mask`
`CreateDocument`	POST	`/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.collection}`	`data/firebase/firestore/document/create`	`data/firebase/firestore/document/create/response`	`access_token`, `collection`, `document`, `project_id`
`GetDocument`	GET	`/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.document_path}`	`data/firebase/firestore/document/get`	`data/firebase/firestore/document/get/response`	`access_token`, `document_path`, `project_id`
`ListDocuments`	GET	`/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.collection}?pageSize={value.json.page_size}`	`data/firebase/firestore/documents/list`	`data/firebase/firestore/documents/list/response`	`access_token`, `collection`, `page_size`, `project_id`
`RunQuery`	POST	`/v1/projects/{value.json.project_id}/databases/(default)/documents:runQuery`	`data/firebase/firestore/documents/query`	`data/firebase/firestore/documents/query/response`	`access_token`, `project_id`, `query`

Deploy

Get the template card (JSON with template and metadata) from the broker, then deploy the connector:

mosquitto_pub -t '$SYS/Coreflux/Command' -m "-connectorCode CLOUD_FIRESTORE"

The deployable connector from the REST API app, with BASE_ADDRESS already filled in:

DEFINE CONNECTOR CloudFirestoreRestApi WITH TYPE REST_API
    ADD REST_API_CONFIG
        WITH BASE_ADDRESS "https://firestore.googleapis.com"
        WITH ENABLE_CLIENT "true"
        WITH USE_SSL "true"
        WITH REQUEST_TIMEOUT '60'
        WITH DEFAULT_CONTENT_TYPE "application/json"
    ADD EVENT UpsertDocument
        WITH SOURCE_TOPIC "data/firebase/firestore/document/upsert"
        WITH DESTINATION_TOPIC "data/firebase/firestore/document/upsert/response"
        WITH METHOD "PATCH"
        WITH ENDPOINT "/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.document_path}"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Content-Type" "application/json"
            ADD "Authorization" "Bearer {value.json.access_token}"
        WITH BODY "{value.json.document}"
    ADD EVENT MergeFields
        WITH SOURCE_TOPIC "data/firebase/firestore/document/merge"
        WITH DESTINATION_TOPIC "data/firebase/firestore/document/merge/response"
        WITH METHOD "PATCH"
        WITH ENDPOINT "/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.document_path}?{value.json.update_mask}"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Content-Type" "application/json"
            ADD "Authorization" "Bearer {value.json.access_token}"
        WITH BODY "{value.json.document}"
    ADD EVENT CreateDocument
        WITH SOURCE_TOPIC "data/firebase/firestore/document/create"
        WITH DESTINATION_TOPIC "data/firebase/firestore/document/create/response"
        WITH METHOD "POST"
        WITH ENDPOINT "/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.collection}"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Content-Type" "application/json"
            ADD "Authorization" "Bearer {value.json.access_token}"
        WITH BODY "{value.json.document}"
    ADD EVENT GetDocument
        WITH SOURCE_TOPIC "data/firebase/firestore/document/get"
        WITH DESTINATION_TOPIC "data/firebase/firestore/document/get/response"
        WITH METHOD "GET"
        WITH ENDPOINT "/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.document_path}"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Authorization" "Bearer {value.json.access_token}"
    ADD EVENT ListDocuments
        WITH SOURCE_TOPIC "data/firebase/firestore/documents/list"
        WITH DESTINATION_TOPIC "data/firebase/firestore/documents/list/response"
        WITH METHOD "GET"
        WITH ENDPOINT "/v1/projects/{value.json.project_id}/databases/(default)/documents/{value.json.collection}?pageSize={value.json.page_size}"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Authorization" "Bearer {value.json.access_token}"
    ADD EVENT RunQuery
        WITH SOURCE_TOPIC "data/firebase/firestore/documents/query"
        WITH DESTINATION_TOPIC "data/firebase/firestore/documents/query/response"
        WITH METHOD "POST"
        WITH ENDPOINT "/v1/projects/{value.json.project_id}/databases/(default)/documents:runQuery"
        WITH HEADERS
            ADD "Accept" "application/json"
            ADD "Content-Type" "application/json"
            ADD "Authorization" "Bearer {value.json.access_token}"
        WITH BODY "{value.json.query}"

Deploy it with -addConnector (do not include ADD METADATA).

Usage example

Call UpsertDocument by publishing a JSON payload to its request topic, and read the reply on the response topic:

mosquitto_sub -t 'data/firebase/firestore/document/upsert/response' &
mosquitto_pub -t 'data/firebase/firestore/document/upsert' -m '{"access_token": "<access_token>", "document": "<document>", "document_path": "<document_path>", "project_id": "<project_id>"}'

Last modified on October 26, 2026

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