Why Use Postman?
- Test backend without a frontend.
- Quickly debug and explore APIs.
- Save and organize requests for teamwork.
For more information past this lesson visit postman docs
1. Write Backend Code in VS Code
- Define API routes in files like
main.py or inside an api/ folder.
- Use the terminal in VS Code to run your Flask server (
python main.py).
2️. Test APIs in Postman
- Choose method (GET, POST, etc.) and enter your API URL.
- Use Body → raw → JSON for sending data.
- View status codes and response data in the panel below.
3. VS Code vs Postman: Where To Find the Information
| Backend (VS Code) |
Testing (Postman) |
| localhost url + endpoint |
type localhost url + endpoint into send bar |
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| Find API call method |
Select HTTP method and enter URL, click Send |
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Use request.json to read JSON data |
Enter JSON data under Body → raw → JSON |
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Handle cookies with request.cookies |
Manage cookies in Postman’s Cookies tab |
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4️. Common HTTP Methods Overview
| Method |
Purpose |
Usage in VS Code |
Postman Tip |
| GET |
Retrieve data |
Route with methods=['GET'] |
No body needed |
| POST |
Create data |
Read JSON from request body |
Use Body tab to send JSON |
| PUT |
Replace data |
Replace full record |
Send full updated data |
| PATCH |
Update part |
Partial update logic |
Send partial JSON data |
| DELETE |
Remove data |
Delete from database |
No body needed |
