Getting started with authentication

Application Default Credentials let your application use service account credentials to access BigQuery resources as its own identity.

Before you begin

Application Default Credentials

Client libraries can use Application Default Credentials to easily authenticate with Google APIs and send requests to those APIs. With Application Default Credentials, you can test your application locally and deploy it without changing the underlying code. For more information, including code samples, see Google Cloud Platform Auth Guide.

When you create a service object with the BigQuery Client Libraries and do not pass in explicit credentials, your application will authenticate using Application Default Credentials.

C#

Before trying this sample, follow the C# setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery C# API reference documentation. 


using Google.Cloud.BigQuery.V2;
using System;

public class BigQueryCreateDataset
{
    public BigQueryDataset CreateDataset(
        string projectId = "your-project-id",
        string location = "US"
    )
    {
        BigQueryClient client = BigQueryClient.Create(projectId);
        var createDatasetOptions = new CreateDatasetOptions()
        {
            // Specify the geographic location where the dataset should reside.
            Location = location
        };
        // Create the dataset
        return client.CreateDataset(
            datasetId: "your_new_dataset_id", options: createDatasetOptions);
    }
}

Go

Before trying this sample, follow the Go setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery Go API reference documentation. 


// Sample bigquery-quickstart creates a Google BigQuery dataset.
package main

import (
	"context"
	"fmt"
	"log"

	"cloud.google.com/go/bigquery"
)

func main() {
	ctx := context.Background()

	// Sets your Google Cloud Platform project ID.
	projectID := "YOUR_PROJECT_ID"

	// Creates a client.
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		log.Fatalf("bigquery.NewClient: %v", err)
	}
	defer client.Close()

	// Sets the name for the new dataset.
	datasetName := "my_new_dataset"

	// Creates the new BigQuery dataset.
	if err := client.Dataset(datasetName).Create(ctx, &bigquery.DatasetMetadata{}); err != nil {
		log.Fatalf("Failed to create dataset: %v", err)
	}

	fmt.Printf("Dataset created\n")
}

Java

Before trying this sample, follow the Java setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery Java API reference documentation. 

public static void implicit() {
  // Instantiate a client. If you don't specify credentials when constructing a client, the
  // client library will look for credentials in the environment, such as the
  // GOOGLE_APPLICATION_CREDENTIALS environment variable.
  BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

  // Use the client.
  System.out.println("Datasets:");
  for (Dataset dataset : bigquery.listDatasets().iterateAll()) {
    System.out.printf("%s%n", dataset.getDatasetId().getDataset());
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery Node.js API reference documentation. 

// Import the Google Cloud client library using default credentials
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();

PHP

Before trying this sample, follow the PHP setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery PHP API reference documentation. 

use Google\Cloud\BigQuery\BigQueryClient;

/** Uncomment and populate these variables in your code */
//$projectId = 'The Google project ID';

$bigQuery = new BigQueryClient([
    'projectId' => $projectId,
]);

Python

Before trying this sample, follow the Python setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery Python API reference documentation. 

from google.cloud import bigquery

# If you don't specify credentials when constructing the client, the
# client library will look for credentials in the environment.
client = bigquery.Client()

Ruby

Before trying this sample, follow the Ruby setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery Ruby API reference documentation. 

require "google/cloud/bigquery"

# This uses Application Default Credentials to authenticate.
# @see https://cloud.google.com/bigquery/docs/authentication/getting-started
bigquery = Google::Cloud::Bigquery.new

sql     = "SELECT " \
          "CONCAT('https://stackoverflow.com/questions/', " \
          "       CAST(id as STRING)) as url, view_count " \
          "FROM `bigquery-public-data.stackoverflow.posts_questions` " \
          "WHERE tags like '%google-bigquery%' " \
          "ORDER BY view_count DESC LIMIT 10"
results = bigquery.query sql

results.each do |row|
  puts "#{row[:url]}: #{row[:view_count]} views"
end

Next steps

Learn how to explicitly authenticate with different credentials types if the default credentials don't suit your application's needs.