Before you begin, you need to understand the data structure of both Gutendex and Convex. Gutendex provides a REST API to access Project Gutenberg’s data, while Convex is a backend service that you can define schemas for.

• Gutendex: Check the API documentation to understand how to query the data you need.
• Convex: Define the data schema that will hold the imported data. Make sure it aligns with the structure of the data being imported from Gutendex.

• Install necessary software, such as Node.js, which is commonly used for scripting ETL processes.
• Set up a new Node.js project by running npm init in your chosen directory.
• Install any necessary libraries, such as axios for making HTTP requests and dotenv for managing environment variables.

npm install axios dotenv

• Write a script using Node.js that utilizes the axios library to make requests to the Gutendex API.
• Handle pagination if the API provides data in pages.
• Extract the data you need, typically in JSON format.

require('dotenv').config();
const axios = require('axios');

async function fetchDataFromGutendex() {
   const apiUrl = 'https://gutendex.com/books/';
   try {
       const response = await axios.get(apiUrl);
       const data = response.data;
       // Handle pagination if necessary
       // Process and return the data
       return data;
   } catch (error) {
       console.error('Error fetching data from Gutendex:', error);
       throw error;
   }
}

• Map the data fields from Gutendex to the corresponding fields in your Convex schema.
• Perform any necessary data transformation, such as formatting dates or converting data types.

function transformData(rawData) {
   return rawData.map(item => {
       return {
           // Map fields from Gutendex to your Convex schema
           title: item.title,
           author: item.authors.map(author => author.name).join(', '),
           // ... other fields
       };
   });
}

• Set up your Convex backend by defining the schema and initializing the database.
• Write a script to load the transformed data into Convex.
• Use Convex’s HTTP API or SDK to insert the data into your Convex database.

const { ConvexHttpClient } = require('convex-js');

async function loadDataToConvex(transformedData) {
   const convexClient = new ConvexHttpClient(process.env.CONVEX_URL);
   for (const item of transformedData) {
       try {
           await convexClient.insert('yourTableName', item);
       } catch (error) {
           console.error('Error loading data to Convex:', error);
       }
   }
}

• Combine the extraction, transformation, and loading steps into a single script.
• Add error handling and logging to ensure the process is robust.
• If necessary, set up a cron job or a scheduled task to run the ETL process at regular intervals.

async function etlProcess() {
   try {
       const rawData = await fetchDataFromGutendex();
       const transformedData = transformData(rawData);
       await loadDataToConvex(transformedData);
       console.log('ETL process completed successfully.');
   } catch (error) {
       console.error('ETL process failed:', error);
   }
}

// Run the ETL process
etlProcess();

• Monitor the ETL process for any failures or issues.
• Update the scripts if the APIs or data structures change.
• Optimize the process for performance and reliability as needed.

Note: Security considerations such as handling API keys or database credentials have been omitted for brevity but should be implemented using best practices such as environment variables and secure storage.