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Version: 12.x (Current)

CRUD Service Configuration

This service can be added to your project by visiting Mia-Platform Marketplace and creating a new microservice from the CRUD Service plugin.

Configure a CRUD Service to use MongoDB CRUD section

In order to start using the MongoDB CRUD section, all you have to do is adding it from the Marketplace: all the ConfigMaps and environment variables it needs will be precompiled with no need to change them.


The CRUD Service supports custom CA certs. If you want to learn more about these certificates and how to configure them in your CRUD Service, visit this page.


The CRUD Service default ConfigMap is mounted in /home/node/app/collections. You can freely choose its name during the service creation.

Furthermore, the ConfigMap is not editable, as it is fundamental for the MongoDB CRUD section to work. It is not possible to add files, edit the mountPath, or delete it.

However, you will find a link that will redirect you to MongoDB CRUD dedicated section where you can continue to configure your project CRUDs. By doing so, you will automatically define the collections that will be handled by the service, which means that there is no need to add any configuration files.

Environment variables

Below you can find all the environment variables that you can edit.

VariableTypeRequiredDefault valueDescription
MONGODB_URLStringRequired-The MongoDB connection string. It must contain the database name on which the collections will be managed.
COLLECTION_DEFINITION_FOLDERStringRequired/home/node/app/collectionsThe path to the folder where all collections are defined.
VIEWS_DEFINITION_FOLDERStringRequired/home/node/app/collectionsThe path to the folder where all views are defined.
USER_ID_HEADER_KEYStringRequired-Header key used to know which user makes the request. User id is useful to add creatorId and updaterId field in collection document.
CRUD_MAX_LIMITIntegerOptional200Configures the maximum limit of objects returned by a MongoDB query.
CRUD_LIMIT_CONSTRAINT_ENABLEDBooleanOptionaltrueEnables the query limit constraint feature. If set to false, the CRUD_MAX_LIMIT environment variable won't be used.
TRUSTED_PROXIESStringOptional10.0.0.0/8,, the trusted proxies values.
HTTP_PORTStringOptional-The port exposed by the service.
LOG_LEVELStringOptionalinfoLevel of the log. It can be one of the following: trace, debug, info, warn, error, fatal.
EXPOSE_METRICSBooleanOptionalfalseSpecifies if Prometheus metrics should be exposed or not.
ALLOW_DISK_USE_IN_QUERIESBooleanOptional-Sets the allowDiskUse option in the MongoDB queries. It is useful when working with MongoDB Views requiring heavy aggregations (added in v6.0.2, works with MongoDB >= 4.4).
ENABLE_TRACINGBooleanOptionalfalseSpecifies if OpenTelemetry tracing should be enabled. It is possible to find more documentation here
ENABLE_STRICT_OUTPUT_VALIDATIONBooleanOptionalfalseSpecifies whether service responses should be strict compliant with the schema (when enabled the service would fail to return values in case underlying collection contains documents not compliant with the schema)
MAX_MULTIPART_FILE_BYTESNumberOptional100Sets the max size (Mb) that is possible to process in multipart requests
MONGODB_MAX_IDLE_TIME_MSNumberOptional0Controls the MongoDB maxIdleTimeMs connection option (default set to 0 for backward compatibility, meaning the opened connection remain opened indefinitely)
HELPERS_PREFIXStringOptional/-/prefix string to assign to the helpers plugin, which exposes additional routes, such as /schemas
OPEN_API_SPECIFICATIONStringOptionalswaggerSpecification used to expose Swagger. Allowed values are: swagger (for Swagger 2.0) and openapi (for OpenAPI 3.0)

Using ALLOW_DISK_USE_IN_QUERIES (either with true or false values) with a MongoDB version lower than 4.4 will make all the GET calls unusable since the MongoDB cluster will raise an error for the unrecognized option allowDiskUse.

It is also important to notice that starting from MongoDB v6.0 new server property allowDiskUseByDefault is introduced with its value set to true by default. Consequently, the default behavior for that MongoDB version is that for queries with pipeline stages using more than 100 MB of memory to execute, the database automatically write temporary files on disk to support those queries.
This default behavior can be disabled for all queries by setting ALLOW_DISK_USE_IN_QUERIES to false.

In case you want to use Client Side Field Level Encryption, you should also include several specific Environment Variables, either you are using the encryption with Google Platform Cloud or a local key.