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Use configuration file environments in Data API builder

Data API builder supports multiple configuration environments, similar to ASP.NET Core's appsettings.json. You can define a base configuration (dab-config.json) and environment-specific variants (dab-config.Development.json, dab-config.Production.json). This feature enables the flexible management of connection strings, authentication settings, and other configuration changes across environments.

Step 1: Create a base configuration

Create a .env file

DEV_CONNECTION_STRING=Server=tcp:127.0.0.1,1433;User ID=<username>;Password=<password>;
PROD_CONNECTION_STRING=Server=tcp:127.0.0.1,1433;User ID=<username>;Password=<password>;

Note

The .env file has no filename, only an extension.

Run dab init to create the base configuration file

dab init --database-type "mssql" --connection-string ""
dab add Book --source "dbo.Books" --permissions "anonymous:*"

This step produces a basic dab-config.json file that is shared across all environments.

Step 2: Add environment-specific configuration files

- dab-config.json
- dab-config.Development.json
- dab-config.Production.json

Development configuration file (dab-config.Development.json)

{
  "data-source": {
    "connection-string": "@env('DEV_CONNECTION_STRING')"
  }
}

Production configuration file (dab-config.Production.json)

{
  "data-source": {
    "connection-string": "@env('PROD_CONNECTION_STRING')"
  }
}

Note

Environment-specific files override the base configuration when DAB_ENVIRONMENT is set.

Step 3: Start DAB with the correct environment

Use this command to set the environment to Development:

DAB_ENVIRONMENT=Development dab start

Use this command to set the environment to Production:

DAB_ENVIRONMENT=Production dab start

Note

If no environment is set, the default environment is Production.

Step 4: Verify setup

  • REST: http://localhost:5000/api/Book
  • GraphQL: http://localhost:5000/graphql
  • Swagger: http://localhost:5000/swagger
  • Health: http://localhost:5000/health

Review

  • Keep .env files out of version control (.gitignore)
  • Use @env() or @akv() for secrets
  • Use DAB_ENVIRONMENT to switch between environments easily
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