API key authentication in Postman

Introduction

API key authentication helps keep your app safe by checking if the user has permission to use the API.

When you want to control who can access your API.

When you need to track how your API is being used.

When you want a simple way to secure your API without complex login.

When testing APIs that require a key to allow requests.

Syntax

Postman

In Postman, add the API key in the Headers or Query Params section:

Headers:
Key: x-api-key
Value: your_api_key_here

OR

Query Params:
Key: api_key
Value: your_api_key_here

You can add the API key either in the request headers or as a query parameter.

Make sure to keep your API key secret and do not share it publicly.

Examples

This example shows adding the API key in the request header named x-api-key.

Postman

Headers:
x-api-key: 12345abcde

This example shows adding the API key as a query parameter named api_key.

Postman

Query Params:
api_key=12345abcde

Sample Program

This is a simple GET request to an API endpoint with the API key added in the headers for authentication.

Postman

GET https://api.example.com/data
Headers:
x-api-key: 12345abcde

Important Notes

Always check the API documentation to know the exact header or query parameter name for the API key.

Using HTTPS is important to keep your API key safe during transmission.

Summary

API key authentication is a simple way to secure API access.

You add the key in headers or query parameters in Postman.

Keep your API key private and use HTTPS for security.