Bearer token in Postman

Introduction

A Bearer token is a secret key used to prove who you are when you ask a server for data. It helps keep your information safe.

When you want to access a website or API that needs you to log in first.

When testing secure APIs that require user authentication.

When automating tests that need to send a token to prove identity.

When checking if the server correctly accepts or rejects requests with tokens.

When debugging issues related to access permissions in APIs.

Syntax

Postman

Authorization: Bearer <token>

The word Bearer is followed by a space and then the token string.

This header is added to HTTP requests to prove your identity.

Examples

This example shows a simple Bearer token string used in the Authorization header.

Postman

Authorization: Bearer abc123xyz456

This example shows a JSON Web Token (JWT) as a Bearer token, which is common in APIs.

Postman

Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...

Sample Program

This is a simple HTTP GET request to fetch a user profile. The Bearer token is sent in the Authorization header to prove the user is allowed to see this data.

Postman

GET /api/user/profile HTTP/1.1
Host: example.com
Authorization: Bearer abc123xyz456

Response:
{
  "id": 1,
  "name": "Alice",
  "email": "[e-mail]"
}

Important Notes

Never share your Bearer token publicly; it is like a password.

Tokens usually expire after some time for security reasons.

In Postman, you can set the Bearer token in the Authorization tab for easy reuse.

Summary

Bearer tokens prove your identity when calling APIs.

They go in the Authorization header as: Bearer <token>.

Use them to test secure API endpoints safely.

Practice

1. What is the correct way to include a Bearer token in a Postman request header?

easy

A. Add a query parameter named 'token' with the token value

B. Set the Authorization header to 'Bearer <token>'

C. Include the token in the request body as JSON

D. Set a cookie named 'Bearer' with the token value

Solution

1. Step 1: Understand Bearer token usage in headers

   Bearer tokens are sent in the Authorization header to prove identity.

2. Step 2: Identify correct header format

   The header must be 'Authorization: Bearer <token>' exactly.

3. Final Answer:

   Set the Authorization header to 'Bearer <token>' -> Option B

4. Quick Check:

   Authorization header = Bearer token [OK]

Hint: Always use Authorization header with 'Bearer ' prefix [OK]

Common Mistakes:

• Putting token in query parameters instead of header
• Sending token in request body instead of header
• Using cookie instead of Authorization header

2. Which of the following is the correct syntax to add a Bearer token in Postman headers?

easy

A. "Auth": "Bearer <token>"

B. "Authorization": "Token <token>"

C. "Authorization": "Bearer <token>"

D. "Authorization": "Basic <token>"

Solution

1. Step 1: Recall correct header key and value format

   The header key must be 'Authorization' and the value must start with 'Bearer '.

2. Step 2: Match the exact syntax

   Only "Authorization": "Bearer <token>" uses 'Authorization' and 'Bearer <token>' correctly.

3. Final Answer:

   "Authorization": "Bearer <token>" -> Option C

4. Quick Check:

   Authorization = Bearer token syntax [OK]

Hint: Remember header key is 'Authorization' and value starts with 'Bearer ' [OK]

Common Mistakes:

• Using 'Token' instead of 'Bearer' prefix
• Using 'Auth' instead of 'Authorization' header
• Confusing 'Basic' auth with Bearer token

3. Given this Postman test script snippet, what will be the value of the Authorization header sent?

pm.request.headers.add({key: 'Authorization', value: `Bearer ${pm.environment.get('token')}`});

medium

A. Authorization: Bearer <token_value_from_environment>

B. Authorization: Token <token_value_from_environment>

C. Authorization: Bearer undefined

D. Authorization: Basic <token_value_from_environment>

Solution

1. Step 1: Understand the code usage of environment variable

   The code uses pm.environment.get('token') to get the token value from environment variables.

2. Step 2: Analyze the header value construction

   The header value is 'Bearer ' plus the token value from environment, so it will be 'Bearer <token_value_from_environment>'.

3. Final Answer:

   Authorization: Bearer <token_value_from_environment> -> Option A

4. Quick Check:

   Header value = 'Bearer ' + environment token [OK]

Hint: Check environment variable usage inside template literals [OK]

Common Mistakes:

• Assuming token is 'undefined' if environment variable missing
• Using 'Token' instead of 'Bearer' prefix
• Confusing Basic auth with Bearer token

4. You added a Bearer token in Postman but the API returns 401 Unauthorized. What is the most likely mistake?

medium

A. The Authorization header is missing the 'Bearer ' prefix

B. The token is placed in the request body instead of headers

C. The Content-Type header is set to 'application/json'

D. The token is expired or invalid

Solution

1. Step 1: Check common causes of 401 Unauthorized with Bearer tokens

   401 usually means token is missing, malformed, or invalid/expired.

2. Step 2: Identify the most likely cause given the token is added

   If the token is added correctly but still 401, it is likely expired or invalid.

3. Final Answer:

   The token is expired or invalid -> Option D

4. Quick Check:

   401 Unauthorized often means invalid token [OK]

Hint: Check token validity if 401 despite correct header [OK]

Common Mistakes:

• Forgetting 'Bearer ' prefix in Authorization header
• Placing token in body instead of header
• Assuming Content-Type affects authorization

5. You want to automate testing of an API that requires a Bearer token which expires every hour. Which approach is best to handle this in Postman?

hard

A. Use a Pre-request Script to fetch a new token and set it dynamically before each request

B. Manually update the token in environment variables before each test run

C. Hardcode the token in the Authorization header and ignore expiration

D. Remove the Authorization header to avoid token expiration errors

Solution

1. Step 1: Understand token expiration and automation needs

   Since the token expires hourly, manual updates are inefficient and error-prone.

2. Step 2: Choose dynamic token fetching in Pre-request Script

   Using a Pre-request Script to get a fresh token before each request automates the process and avoids failures.

3. Final Answer:

   Use a Pre-request Script to fetch a new token and set it dynamically before each request -> Option A

4. Quick Check:

   Automate token refresh with Pre-request Script [OK]

Hint: Automate token refresh with Pre-request Script [OK]

Common Mistakes:

• Manually updating tokens wastes time and causes errors
• Hardcoding tokens ignores expiration and causes failures
• Removing Authorization header breaks authentication