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What are Secrets in ASP.NET Core, and how are they different from configuration files?

Junior .NET Core
Quick Answer Secrets (User Secrets in dev, Azure Key Vault in production) store sensitive values (connection strings, API keys) outside appsettings.json so they're never committed to source control. In development, dotnet user-secrets stores them in a local JSON file outside the project. In production, inject them via environment variables or a secrets manager.

Answer

User Secrets are a development-only feature for storing sensitive values (API keys, connection strings) outside the project tree.

  • They are not checked into source control.
  • They are only used for the Development environment.
  • They override configuration from JSON files.

In production, secrets should come from environment variables, Azure Key Vault, or similar secure stores, not from JSON configuration files.

S
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This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.

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