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Showing content from https://cloud.google.com/nodejs/docs/reference/datastore/8.4.0/datastore/query below:

Class Query (8.4.0) | Node.js client library

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Build a Query object.

**Queries are built with {module:datastore#createQuery} and .**

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const query = datastore.createQuery('AnimalNamespace', 'Lion');

constructor(scope?: Datastore | Transaction, kinds?: string[] | null);

Constructs a new instance of the Query class

constructor(scope?: Datastore | Transaction, namespace?: string | null, kinds?: string[]);

Constructs a new instance of the Query class

endVal: string | Buffer | null;

entityFilters: EntityFilter[];

namespace?: string | null;

scope?: Datastore | Transaction;

startVal: string | Buffer | null;

end(end: string | Buffer): this;

Set an ending cursor to a query.

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const companyQuery = datastore.createQuery('Company');

const cursorToken = 'X';

// Retrieve results limited to the extent of cursorToken.
const endQuery = companyQuery.end(cursorToken);

filter(filter: EntityFilter): Query;

Datastore allows querying on properties. Supported comparison operators are =, <, >, <=, >=, !=, HAS_ANCESTOR, IN and NOT_IN.

*To filter by ancestors, see {module:datastore/query#hasAncestor}.*

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const query = datastore.createQuery('Company');

//-
// List all companies that are located in California.
//-
const caliQuery = query.filter('state', 'CA');

//-
// List all companies named Google that have less than 400 employees.
//-
const companyQuery = query
  .filter('name', 'Google')
  .filter('size', '<', 400);="" -="" to="" filter="" by="" key,="" use="" `__key__`="" for="" the="" property="" name.="" filter="" on="" keys="" stored="" as="" properties="" is="" not="" currently="" supported.="" -="" const="" key="datastore.key(['Company'," 'google']);="" const="" keyquery="query.filter('__key__'," key);="">

filter<T extends string>(property: T, value: AllowedFilterValueType<T>): Query;

filter<T extends string>(property: T, operator: Operator, value: AllowedFilterValueType<T>): Query;

groupBy(fieldNames: string | string[]): this;

Group query results by a list of properties.

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const companyQuery = datastore.createQuery('Company');
const groupedQuery = companyQuery.groupBy(['name', 'size']);

hasAncestor(key: Key): this;

Filter a query by ancestors.

Key object to filter by.

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const query = datastore.createQuery('MyKind');
const ancestoryQuery = query.hasAncestor(datastore.key(['Parent', 123]));

Set a limit on a query.

The number of results to limit the query to.

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const companyQuery = datastore.createQuery('Company');

// Limit the results to 10 entities.
const limitQuery = companyQuery.limit(10);

Set an offset on a query.

The offset to start from after the start cursor.

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const companyQuery = datastore.createQuery('Company');

// Start from the 101st result.
const offsetQuery = companyQuery.offset(100);

order(property: string, options?: OrderOptions): this;

Sort the results by a property name in ascending or descending order. By default, an ascending sort order will be used.

The property to order by.

Options object.

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const companyQuery = datastore.createQuery('Company');

// Sort by size ascendingly.
const companiesAscending = companyQuery.order('size');

// Sort by size descendingly.
const companiesDescending = companyQuery.order('size', {
  descending: true
});

run(options?: RunQueryOptions): Promise<RunQueryResponse>;

Run the query.

Optional configuration.

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const query = datastore.createQuery('Company');

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

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

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

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

//-
// If the callback is omitted, we'll return a Promise.
//-
query.run().then((data) => {
  const entities = data[0];
});

run(options: RunQueryOptions, callback: RunQueryCallback): void;

run(callback: RunQueryCallback): void;

runStream(options?: RunQueryStreamOptions): import("stream").Transform;

Run the query as a readable object stream.

Query#runStream

Optional configuration. See for a complete list of options.

{stream}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const query = datastore.createQuery('Company');

query.runStream()
  .on('error', console.error)
  .on('data', function (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.
//-
query.runStream()
  .on('data', function (entity) {
    this.end();
  });

select(fieldNames: string | string[]): this;

Retrieve only select properties from the matched entities.

Queries that select a subset of properties are called Projection Queries.

Properties to return from the matched entities.

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const companyQuery = datastore.createQuery('Company');

// Only retrieve the name property.
const selectQuery = companyQuery.select('name');

// Only retrieve the name and size properties.
const selectQuery = companyQuery.select(['name', 'size']);

start(start: string | Buffer): this;

Set a starting cursor to a query.

{Query}

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();
const companyQuery = datastore.createQuery('Company');

const cursorToken = 'X';

// Retrieve results starting from cursorToken.
const startQuery = companyQuery.start(cursorToken);

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

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