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Showing content from https://cloud.google.com/nodejs/docs/reference/datastore/8.0.0/datastore/datastorerequest below:

Class DatastoreRequest (8.0.0) | Node.js client library

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Handle logic for Datastore API operations. Handles request logic for Datastore.

Creates requests to the Datastore endpoint. Designed to be inherited by the Datastore and Transaction classes.

requestCallbacks_: Array<(err: Error | null, resp: Entity | null) => void> | Entity;

requests_: Entity | {
        mutations: Array<{}>;
    };

allocateIds(key: entity.Key, options: AllocateIdsOptions | number): Promise<AllocateIdsResponse>;

Generate IDs without creating entities.

The key object to complete.

Either the number of IDs to allocate or an options object for further customization of the request.

const incompleteKey = datastore.key(['Company']);

//-
// The following call will create 100 new IDs from the Company kind, which
// exists under the default namespace.
//-
datastore.allocateIds(incompleteKey, 100, (err, keys) => {});

//-
// Or, if you're using a transaction object.
//-
const transaction = datastore.transaction();

transaction.run((err) => {
  if (err) {
    // Error handling omitted.
  }

  transaction.allocateIds(incompleteKey, 100, (err, keys) => {
    if (err) {
      // Error handling omitted.
    }

    transaction.commit((err) => {
      if (!err) {
        // Transaction committed successfully.
      }
    });
  });
});

//-
// You may prefer to create IDs from a non-default namespace by providing
an
// incomplete key with a namespace. Similar to the previous example, the
call
// below will create 100 new IDs, but from the Company kind that exists
under
// the "ns-test" namespace.
//-
const incompleteKey = datastore.key({
  namespace: 'ns-test',
  path: ['Company']
});

function callback(err, keys, apiResponse) {}

datastore.allocateIds(incompleteKey, 100, callback);

//-
// Returns a Promise if callback is omitted.
//-
datastore.allocateIds(incompleteKey, 100).then((data) => {
  const keys = data[0];
  const apiResponse = data[1];
});

allocateIds(key: entity.Key, options: AllocateIdsOptions | number, callback: AllocateIdsCallback): void;

createReadStream(keys: Entities, options?: CreateReadStreamOptions): Transform;

Retrieve the entities as a readable object stream.

Datastore key object(s).

Optional configuration. See for a complete list of options.

const keys = [
  datastore.key(['Company', 123]),
  datastore.key(['Product', 'Computer'])
];

datastore.createReadStream(keys)
  .on('error', (err) =>  {})
  .on('data', (entity) => {
    // entity is an entity object.
  })
  .on('end', () => {
    // All entities retrieved.
  });

delete(keys: Entities, gaxOptions?: CallOptions): Promise<DeleteResponse>;

Delete all entities identified with the specified key(s).

Request configuration options, outlined here: https://googleapis.github.io/gax-nodejs/global.html#CallOptions.

const key = datastore.key(['Company', 123]);
datastore.delete(key, (err, apiResp) => {});

//-
// Or, if you're using a transaction object.
//-
const transaction = datastore.transaction();

transaction.run((err) => {
  if (err) {
    // Error handling omitted.
  }

  transaction.delete(key);

  transaction.commit((err) => {
    if (!err) {
      // Transaction committed successfully.
    }
  });
});

//-
// Delete multiple entities at once.
//-
datastore.delete([
  datastore.key(['Company', 123]),
  datastore.key(['Product', 'Computer'])
], (err, apiResponse) => {});

//-
// Returns a Promise if callback is omitted.
//-
datastore.delete().then((data) => {
  const apiResponse = data[0];
});

delete(keys: Entities, callback: DeleteCallback): void;

delete(keys: Entities, gaxOptions: CallOptions, callback: DeleteCallback): void;

get(keys: entity.Key | entity.Key[], options?: CreateReadStreamOptions): Promise<GetResponse>;

Retrieve the entities identified with the specified key(s) in the current transaction. Get operations require a valid key to retrieve the key-identified entity from Datastore.

Datastore key object(s).

Optional configuration.

//-
// Get a single entity.
//-
const key = datastore.key(['Company', 123]);

datastore.get(key, (err, entity) => {});

//-
// Or, if you're using a transaction object.
//-
const transaction = datastore.transaction();

transaction.run((err) => {
  if (err) {
    // Error handling omitted.
  }

  transaction.get(key, (err, entity) => {
    if (err) {
      // Error handling omitted.
    }

    transaction.commit((err) => {
      if (!err) {
        // Transaction committed successfully.
      }
    });
  });
});

//-
// Get multiple entities at once with a callback.
//-
const keys = [
  datastore.key(['Company', 123]),
  datastore.key(['Product', 'Computer'])
];

datastore.get(keys, (err, entities) => {});

//-
// Below is how to update the value of an entity with the help of the
// `save` method.
//-
datastore.get(key, (err, entity) => {
  if (err) {
    // Error handling omitted.
  }

  entity.newValue = true;

  datastore.save({
    key: key,
    data: entity
  }, (err) => {});
});

//-
// Returns a Promise if callback is omitted.
//-
datastore.get(keys).then((data) => {
  const entities = data[0];
});

get(keys: entity.Key | entity.Key[], callback: GetCallback): void;

get(keys: entity.Key | entity.Key[], options: CreateReadStreamOptions, callback: GetCallback): void;

merge(entities: Entities): Promise<CommitResponse>;

Merge the specified object(s). If a key is incomplete, its associated object is inserted and the original Key object is updated to contain the generated ID. For example, if you provide an incomplete key (one without an ID), the request will create a new entity and have its ID automatically assigned. If you provide a complete key, the entity will be get the data from datastore and merge with the data specified. By default, all properties are indexed. To prevent a property from being included in *all* indexes, you must supply an excludeFromIndexes array.

Maps to , forcing the method to be upsert.

Datastore key object(s).

merge(entities: Entities, callback: SaveCallback): void;

prepareGaxRequest_(config: RequestConfig, callback: Function): void;

request_(config: RequestConfig, callback: RequestCallback): void;

Make a request to the API endpoint. Properties to indicate a transactional or non-transactional operation are added automatically.

Configuration object.

The callback function.

requestStream_(config: RequestConfig): AbortableDuplex;

Make a request as a stream.

Configuration object.

runAggregationQuery(query: AggregateQuery, options?: RunQueryOptions): Promise<RunQueryResponse>;

runAggregationQuery(query: AggregateQuery, options: RunQueryOptions, callback: RequestCallback): void;

runAggregationQuery(query: AggregateQuery, callback: RequestCallback): void;

runQuery(query: Query, options?: RunQueryOptions): Promise<RunQueryResponse>;

Datastore allows you to query entities by kind, filter them by property filters, and sort them by a property name. Projection and pagination are also supported.

The query is run, and the results are returned as the second argument to your callback. A third argument may also exist, which is a query object that uses the end cursor from the previous query as the starting cursor for the next query. You can pass that object back to this method to see if more results exist.

Query object.

Optional configuration.

//-
// Where you see `transaction`, assume this is the context that's relevant
to
// your use, whether that be a Datastore or a Transaction object.
//-
const query = datastore.createQuery('Lion');

datastore.runQuery(query, (err, entities, info) => {
  // entities = An array of records.

  // Access the Key object for an entity.
  const firstEntityKey = entities[0][datastore.KEY];
});

//-
// Or, if you're using a transaction object.
//-
const transaction = datastore.transaction();

transaction.run((err) => {
  if (err) {
    // Error handling omitted.
  }

  transaction.runQuery(query, (err, entities) => {
    if (err) {
      // Error handling omitted.
    }

    transaction.commit((err) => {
      if (!err) {
        // Transaction committed successfully.
      }
    });
  });
});

//-
// A keys-only query returns just the keys of the result entities instead
of
// the entities themselves, at lower latency and cost.
//-
const keysOnlyQuery = datastore.createQuery('Lion').select('__key__');

datastore.runQuery(keysOnlyQuery, (err, entities) => {
  const keys = entities.map((entity) => {
    return entity[datastore.KEY];
  });
});

//-
// Returns a Promise if callback is omitted.
//-
datastore.runQuery(query).then((data) => {
  const entities = data[0];
});

runQuery(query: Query, options: RunQueryOptions, callback: RunQueryCallback): void;

runQuery(query: Query, callback: RunQueryCallback): void;

runQueryStream(query: Query, options?: RunQueryStreamOptions): Transform;

Get a list of entities as a readable object stream.

See for a list of all available options.

Query object.

Optional configuration.

datastore.runQueryStream(query)
  .on('error', console.error)
  .on('data', (entity) => {
    // Access the Key object for this entity.
    const key = entity[datastore.KEY];
  })
  .on('info', (info) => {})
  .on('end', () => {
    // All entities retrieved.
  });

//-
// If you anticipate many results, you can end a stream early to prevent
// unnecessary processing and API requests.
//-
datastore.runQueryStream(query)
  .on('data', (entity) => {
    this.end();
  });

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Last updated 2025-08-07 UTC.

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