One of our main challenges was gathering reliable data for government-run blood banks. We used the data.gov.in API, but it was tougher than expected. The data was massive and often disorganized, making it tricky to structure it well for our MongoDB database. To solve this, we carefully reviewed the API documentation, selecting only the most relevant data. Using the MongoDB Node.js driver, we then wrote scripts to automate data collection and ensure consistency. We also used Postman to test our API requests and verify that everything was working smoothly.