# Week 2

In this session we will focus on designing and documenting a REST API on top of the existing Snippets backend. We will refine the resource structure, design consistent error handling and validation rules, describe the API using OpenAPI/Swagger, and use Knex safely with attention to SQL injection. We will also level up Postman usage with collections, environments, secrets, and tests for your endpoints.

## Contents

* [Preparation](/course-content/backend/node/week2/preparation.md)
* [Session Plan](/course-content/backend/node/week2/session-plan.md) (for mentors)
* [Assignment](/course-content/backend/node/week2/assignment.md)

## Session Learning goals

By the end of this session, you will be able to:

* [ ] Design RESTful endpoints for the Snippets domain using clear resources, routes, and HTTP methods.
* [ ] Describe your API using an OpenAPI/Swagger specification, including parameters, request bodies, responses, and error cases.
* [ ] Decide on consistent error models and validation rules for your API and apply them across endpoints.
* [ ] Recognise and fix SQL injection issues when working with Knex, using query builder methods safely.
* [ ] Configure Postman for advanced backend development:
  * [ ] Create and organise collections for your Snippets API.
  * [ ] Set up environments and variables for different backends.
  * [ ] Manage secrets using the Postman Vault or sensitive variables.
  * [ ] Create basic test suites to automatically validate key responses.


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