Hi folks! In this blog post, I’m going to introduce you to an easy way to convert Postman collections to OpenAPI schema in just one click. To see it in action, go to p2o.defcon007.com

What is OpenAPI schema?

According to Wikipedia, OpenAPI Specification, previously known as the Swagger Specification, is a specification for machine-readable interface files for describing, producing, consuming, and visualizing RESTful web services.

It provides a standard way to share your API designs with others, and even auto-generate documentations using various tools.

If you try to write an OpenAPI schema file for your service, one of the major challenges you will face is remembering the structure and ways in which different entities are described in the specification. Tools like Postman, makes it very easy to test your endpoints by writing requests and grouping them together inside collections. The ease of use and intuitiveness of the tool makes it very easy to define all the endpoints inside Postman collections, but creating an OpenAPI schema manually for all the endpoints is very cumbersome.

I always find it very easy to create a collection for my service and use it during the development itself for testing purpose. There are solutions already present to convert the collection to OpenAPI schema, but most of them are CLI tools. I wanted a quick way to convert the collection to OpenAPI schema. I was also reading about Next.js at the time and wanted to try it out.

Hence, Postman to OpenAPI online was born. It is a small online utility powered by Next.js to convert Postman collections to OpenAPI schema file. For data privacy reasons, all the conversion happens inside your browser keeping all of your data safe.

You can either load the collection from an exported JSON or directly use the collection URL.

Note: If your collection is not public, create an access token in Postman and add ?apikey=<POSTMAN_API_KEY> at end of the URL to access it.

Now, to generate the OpenAPI schema

Demo

Convert collection JSON file to OpenAPI schema

Convert collection via URL to OpenAPI schema

Thank you for reading! Head over to https://github.com/DefCon-007/postman-to-openapi-online to contribute to the source code.

Acknowledgements

• Thanks to @joolfe for the awesome postman-to-openapi NPM package which made conversion easy.

• Website design taken from codebushi and theme name is Next.js Dimension

Py-WhatsApp is the un-official python module for chat-api.com and provides a pure pythonic way to communicate with WhatsApp programmatically without the official business API.

Github - https://github.com/DefCon-007/py-whatsapp

PyPi - https://pypi.org/project/whatsapp-api/

What is chat-api.com

It is a multifunctional rest api for WhatsApp accounts working on top of WhatsApp web. They offer a 3-day free trial to allow you to use the service before buying and this python package allows you to interface with most of its services directly.

Pitfalls of official WhatsApp API

• You first need to get approved from WhatsApp to start using the business API.

• You are tied in with a third party provider to avail the services and has to pay their set prices which are generally low but depends on per incoming/outgoing message.

• When someone contacts your number, you have to reply with in 24 hours. Post that, you can only send a template message to the contact.

• You cannot send any message to a person who has not initiated a conversation with you, you can only send them a template message.What is template message? This is a message which has to be first approved by WhatsApp and then you can use it to contact potential customers or reply to conversations which are older than 24 hours.

For more information head over to https://www.whatsapp.com/business/api/.

How to use

• Go to chat-api.com and create a new account.

• After successful account creation you will have a single instance active, copy the instanceId and token and keep them safe.

• Install the module using pip install whatsapp-api.

• Now use the following code snippet to send the message. Click here to read more in-depth details on using the library.

from whatsapp import WhatsApp

token = "xxxxxxx"
instance_id = "instancexxx"

object = WhatsApp(token, instance_id)

phone_number = "911234512345"
message = "This is a sample text message. *This will be bold*"

response = object.send_message(phone_number, message)

• Keep in mind the phone number has to be in the international format, here the sample number is from India(country code +91).

Disclaimer

I am in no way associated to WhatsApp or Chat-API. This post and the corresponding module is only for educational purpose.

Histrock was made as a submission for Societe Generale Brainwaves 2019 hackathon. It is a django application for historic stock data analysis along with real-time stock charts and economic calender.

The project made it to the all India finals from the 10,200+ applicants.

Github - https://github.com/DefCon-007/histrock.

Features

• Check historical stock trend analysis on responsive charts which can be exported as png.

• Realtime economic calender displaying latest events.

• Automatically selects oldest or most records if start or end date not given.

• Realtime stock chart.

• Easy-to-implement REST API.

Demonstration

Below is a short video demonstration of the project.

Screenshots

Trainman helps you to find alternate train bookings on the same route and train for Indian railways.

You can check it out at https://trainman.defcon007.com/

Github - https://github.com/DefCon-007/trainman

How it works

Let’s say your train starts at source station A and ends at destination station F and follows the following path:

A -> B -> C -> D -> E -> F

Now you want to travel from B to D, but there is no ticket available. Indian trains have ticket quotas on the basis of stations. So, even if tickets from B to D are fully booked, you may get a reservation from any of the following routes in the same train :

A->D A->E A->F . . .

TrainMan lists availability on these kind of alternate routes to make your journey hassel free.

Screenshots

Utilo is a one stop solution to a number of problems we face in day to day life. For example, Downloading a youtube video, being up to date with a facebook page or twitter handle etc. Utilo uses telegram to communicate with the users. It is a Utility bot which works on telegram. Utilo has a lot of useful functions :

• File URL generator

• Youtube download and search

• Facebook and twitter subscription

• If you want to send someone an E-mail without using your E-mail id Utilo can help you in that too.

• If you feel bored Utilo can also entertain you with hilarious random Chuck Norris jokes.

This project also won 3rd place in DigitalOcean CloudHack’s online edition !

Screenshots

Using youtube search

Using youtube download

Using file link generators

Getting Jokes

Sending Mail

Check it out here . If you need some help, just tell me.