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POST
/
api
/
auth
/
refresh
Refresh Token
curl --request POST \
  --url https://api.example.com/api/auth/refresh \
  --header 'Content-Type: application/json' \
  --data '
{
  "RefreshToken": "<string>"
}
'
{
  "AccessToken": "<string>",
  "RefreshToken": "<string>",
  "AccessTokenExpiry": {},
  "User": {}
}

​
Description

Exchanges a valid refresh token for a new access token and refresh token pair. The old refresh token is automatically revoked as part of the token rotation security mechanism. The service implements automatic token rotation and detects token reuse attacks. If a revoked token is presented, all tokens in that family are revoked for security.

​
Authentication

No authentication required (uses refresh token in request body).

​
Request Body

​
RefreshToken
string
required
Valid refresh token obtained from a previous login or refresh operation.

​
Response

​
AccessToken
string
New JWT access token for authenticating subsequent requests. Typically expires in 15 minutes.
​
RefreshToken
string
New refresh token to replace the old one. Typically expires in 7 days.
​
AccessTokenExpiry
datetime
ISO 8601 timestamp indicating when the access token expires.
​
User
object
User information object containing:
  • Id (guid): Unique user identifier
  • Username (string): The username
  • Email (string): The user’s email address
  • CreatedAt (datetime): Account creation timestamp

​
Status Codes

  • 200 OK: Successfully refreshed tokens
  • 401 Unauthorized: Invalid, expired, or revoked refresh token

​
Example Request

cURL
curl -X POST http://localhost:5000/api/auth/refresh \
  -H "Content-Type: application/json" \
  -d '{
    "RefreshToken": "a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6"
  }'

​
Example Response

200 OK
{
  "AccessToken": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
  "RefreshToken": "z9y8x7w6v5u4t3s2r1q0p9o8n7m6l5k4",
  "AccessTokenExpiry": "2026-03-10T16:00:00Z",
  "User": {
    "Id": "123e4567-e89b-12d3-a456-426614174000",
    "Username": "johndoe",
    "Email": "[email protected]",
    "CreatedAt": "2026-03-10T15:30:00Z"
  }
}
401 Unauthorized
{
  "message": "Refresh token inválido."
}
401 Token Expired
{
  "message": "Refresh token expirado."
}

​
Security Notes

  • The old refresh token is automatically revoked and cannot be reused
  • Token reuse detection: If a revoked token is presented, all descendant tokens are revoked
  • Tokens older than 30 days are automatically cleaned up

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