ReWise: AI-powered revision bot.

Inspiration

Being a beginner to web development, I was excited to work on a project involving a lot of web-related concepts, leveraging APIs, computer vision and at the same time making something that I could use every day.

What it does

Exam time can be stressful for students and teachers who are bogged down with cramming material or setting questions. ReWise is a messenger bot that works in a super-easy and friendly manner to solve this problem.

One can click a picture of the notes/study material and then generate a bunch of quiz questions to assess how well one has assimilated the material.
The quiz once generated can either be taken live or can be mailed around to your email address. This allows for not just students but for educators to also catch a break!
Making a bot for this use case makes sense as we all would love to get an experience as close to the exam scenario as possible without consequences and the fear of being judged. Having a personal bot at your disposal solves exactly that!

How I built it

Used the messenger platform, with Node.js for the backend.
To extract the text from the images sent, I have hosted a simple OCR Flask app that does some pre-processing in OpenCV and uses the tesseract engine.
The text extracted is then stored and passed to the Quillionz API which generates questions based on the text sent.
Used node mailer for emailing.
Used PDFkit library for generating PDFs of the question paper and answer key.
Maintained user state in SQLite.

Challenges I ran into

It got tedious to maintain and update the state of the user as the messenger platform uses webhooks.
Callbacks got pretty nested.
Connecting all the APIs and making everything work smoothly.

(PS: The mailer option is not available due to a security issue. However, the main code for the feature is available in the repo.)

Accomplishments that I'm proud of

I'm really satisfied with the amount of code I could churn out in a short amount of time.
Learnt lots of nitty-gritty details of web development.
Glad that I could put up an end to end product.