Your Sunday, upgraded. Free live AI class · 5 PM ISTReserve your seat
Build / Developer Tools
PRODUCT BUILD · PROPOSED

Build an API testing tool

Send requests, save collections, use environments and run assertions.

PRODUCT BUILDING COURSE12 hours
Choose how to learn

Live, interactive classes with time for every learner's questions and code reviews.

Request this batch A 5–10 learners batch starts once enough learners ask. You confirm and pay only when dates are set.
Developer ToolsIntermediate4 modulesEnrolment not yet open
AT A GLANCE

What this build involves.

Prerequisites

Comfortable writing code in one language and using Git and the terminal.

Difficulty
Intermediate
Build type
Complete product build
Formats
Webapp, Desktop app
Build stages
Concept → POC → MVP → Production implementation
Learning formats
Guided series, Mentored build
Stack
TypeScript · Node.js · SQLite · npm

Only need the code? The API testing tool source code is sold separately for ₹1,299. Request the source code — availability is confirmed before you pay.

DEMO

See what you will build.

A recorded walkthrough of the finished API testing tool is shared when this build opens. Register interest to be told first.

FEATURE CHECKLIST

Included modules.

  • Request builder
  • Collections
  • Environments
  • Test assertions
  • Authentication and user roles
  • Deployment to npm
LEARNING STEPS

Seven units, from concept to improvement.

  1. 01

    Concept

    Who uses an API testing tool, what problem it solves and the use cases you will support.

  2. 02

    Fundamentals

    TypeScript, Node.js and SQLite, plus the data model and architecture for this product.

  3. 03

    POC

    A working demonstration of request builder.

  4. 04

    Feature build

    Collections, Environments, Test assertions, with authentication and data validation.

  5. 05

    Complete project

    All 4 modules connected into one usable webapp.

  6. 06

    Production implementation

    Automated tests, security review, deployment to npm, monitoring and documentation.

  7. 07

    Improvement challenge

    Publish the tool as a package with docs, versioned releases and tests in CI.

WAYS TO LEARN THIS BUILD

Start small or go all the way.

01

Free micro lesson

The data model behind request builder

02

Microcourse

Build the request builder module

03

Live workshop

Build collections live, step by step

04

Paid build series

Request builder → Collections → Environments → Test assertions

05

Mentorship

Review of your architecture and code

BUILD IT LIVE

Build the core of this product with Ajay, live.

The Sunday workshop “Build a Contract Test for an External API” builds the heart of this product step by step. Join it first, then extend it into the full build below.

See dates and register
Workshop
Build a Contract Test for an External API
Date
Sunday, 3 September 2028
Sessions
English 11 AM–2 PM · Hinglish 8 PM–11 PM IST
You leave with
Leave with a provider contract test with local response fixtures.
REPOSITORY & REVIEW

What you get, and how it is checked.

Repository access

Enrolled learners get access to the starter repository: project structure, database schema, sample data and a setup guide, plus a reference solution for each unit.

Review criteria

  • Every feature on the checklist works end to end
  • Data model and architecture are explained in the README
  • Inputs are validated and access is restricted to the right users
  • Key flows are covered by automated tests
  • The app is deployed and reachable from a public URL
  • Interfaces meet basic accessibility checks

Improvement challenge

Publish the tool as a package with docs, versioned releases and tests in CI.

Project mentorship

Architecture, debugging and implementation reviews with Ajay.

Explore mentorship
AFTER YOU FINISH

A certificate, and support for what comes next.

Finishing this build is planned to include the support below. It opens with the first batch; enrolment pages confirm what is included before you pay.

Completion certificate

Issued with a unique ID once your final project passes review. It records what you built, not just attendance.

Certification policy

Job-readiness support

Portfolio and GitHub review, resume feedback, a mock interview and referrals when suitable openings come up. No placement guarantee.

Career mentorship

Freelancing support

Guidance on pricing, proposals and your first client project, plus a review of your freelance profile and portfolio.

Build client-style projects

Startup community

An invite to the Innovate with Ajay community to meet builders, find co-founders, join hackathons and get feedback on product ideas.

Explore the community
YOUR NEXT LEARNING STEP

Want to learn this?

Share your interest. We’ll confirm availability, batch dates and the fee separately, so you can decide when the details are ready.

  • Your course is already selected
  • Just your name and email to get started
  • No payment or booking commitment
Looking for a different course? Tell us →

Get availability updates.

YOU’RE INTERESTED INBuild an API testing tool
Add learning preferences Optional

No payment now. Availability, dates and the fee are confirmed separately. We’ll use these details to reply. Privacy policy

RELATED BUILDS

More in Developer Tools.

Tech, Junior

Mock API server

What you build
Spin up fake endpoints from a spec so front-end work is never blocked.
Prerequisites
Comfortable writing code in one language and using Git and the terminal.
Stack
TypeScript · Node.js · SQLite
  • Spec import
  • Mock responses
  • Latency & errors
  • Request log
Final deliverableA working mock API server with spec import, mock responses, latency & errors and request log, deployed as an MVP.
Beginner4 modulesCLI tool, API
From₹490₹99051% off· 10 hours
Tech, Junior

Code generator

What you build
Generate project boilerplate and CRUD code from a schema.
Prerequisites
Comfortable writing code in one language and using Git and the terminal.
Stack
TypeScript · Node.js · SQLite
  • Schema input
  • Templates
  • Generated code
  • Customisation hooks
Final deliverableA working code generator with schema input, templates, generated code and customisation hooks, tested and deployed to production.
Intermediate4 modulesCLI tool
From₹490₹99051% off· 10 hours
Tech, Senior

Feature flag manager

What you build
Toggle features per user or segment with SDKs and audit logs.
Prerequisites
Comfortable writing code in one language and using Git and the terminal.
Stack
TypeScript · Node.js · SQLite
  • Flag dashboard
  • Targeting rules
  • Client SDK
  • Audit log
Final deliverableA working feature flag manager with flag dashboard, targeting rules, client SDK and audit log, tested and deployed to production.
Advanced4 modulesWebapp, API
From₹588₹1,18851% off· 12 hours
NOT SURE WHERE TO START?

Learn the skills first, then build.

Pick up TypeScript and Node.js in the course catalogue, or follow a full role path.

Browse courses
Chat with Ajay