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API Testing Tools

You’ve designed your endpoints, chosen your status codes, and secured them with JWT. Now, how do you actually "call" them? Since we don't have a frontend yet, we use API Testing Tools.

These tools act as a "Universal Client" that can send any HTTP request to any server.

Top 3 Tools for Developers​

Why we love it:​

It is a lightweight extension that lives inside VS Code. You don't need to switch between apps!

  • Best For: Quick testing during coding.
  • Pros: Fast, stays in your editor, supports "Collections" and "Environment Variables."
  • Installation: Search for "Thunder Client" in the VS Code Extensions marketplace.

Anatomy of an API Request​

When using these tools, you will need to configure four main parts:

  1. Method: Select GET, POST, PUT, or DELETE.
  2. URL (Endpoint): Where is your server running? (e.g., http://localhost:5000/api/users).
  3. Headers: This is where you put your Content-Type (usually application/json) and your Authorization tokens.
  4. Body: For POST and PUT requests, this is where you paste your JSON data.

Understanding the Response​

Once you hit "Send," the tool will show you:

Professional Workflow: Environment Variables​

Don't hardcode your URLs! Imagine you have 50 requests. If you change your port from 5000 to 8000, you don't want to edit 50 requests manually.

Use Variables:

  • Create a variable called {{base_url}}.
  • Set it to http://localhost:5000.
  • Your requests will look like: {{base_url}}/users.

Now, when you go to production, you just change the variable once!

Summary Checklist​

  • I have installed Thunder Client or Postman.
  • I know how to set the HTTP Method and URL.
  • I can send a JSON body in a POST request.
  • I understand how to read the Status Code and Response Body.
🎉 Module Complete!

You have mastered the theory of Relational Databases and API Design. You are now officially ready to start writing real code!

Last updated on by Ajay Dhangar