Objective

Build a minimal ASP.NET Core Web API to manage notes.
You may use AI tools to assist, but your code must run and meet all requirements.

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Requirements

1. Endpoints

• POST /notes → Add a new note
  • Title: required, max 100 chars
  • Content: optional
  • CreatedAt: auto-set
• GET /notes → List all notes
• GET /notes/{id} → Get a note by ID
• DELETE /notes/{id} → Delete a note

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2. Technical Constraints

• .NET 6+ or 7+
• ASP.NET Core Web API
• Entity Framework Core InMemory database
• Proper HTTP status codes:
  • 201 Created (new note)
  • 200 OK (get/delete)
  • 404 Not Found (missing note)
  • 400 Bad Request (validation errors)

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3. Bonus (Optional)

• PUT /notes/{id} → Update a note
• Filtering in GET /notes by keyword
• Swagger/OpenAPI documentation

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Example Input / Output

Create Note – POST /notes

Request

{
  "title": "First Note",
  "content": "This is my first note."
}

Response – 201 Created

{
  "id": 1,
  "title": "First Note",
  "content": "This is my first note.",
  "createdAt": "2025-08-13T14:35:22Z"
}

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Get All Notes – GET /notes

Response – 200 OK

[
  {
    "id": 1,
    "title": "First Note",
    "content": "This is my first note.",
    "createdAt": "2025-08-13T14:35:22Z"
  }
]

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Get Note by ID – GET /notes/99

Response – 404 Not Found

{
  "message": "Note not found."
}

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Delete Note – DELETE /notes/1

Response – 200 OK

{
  "message": "Note deleted successfully."
}

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How to Run

dotnet restore
dotnet run

OR 
Use visual studio RUN

API will run at:

https://localhost:xxxx

Swagger (if enabled):

https://localhost:xxxx/swagger