Shrtlnk Authentication: API Key Setup & Security (2026)

Authentication overview

Shrtlnk's API utilizes a straightforward authentication model revolving around API keys. This approach provides a balance of security and ease of implementation for developers integrating with the Shrtlnk platform to manage their shortened URLs, track link analytics, and generate QR codes. Each API key is tied to a specific user account and grants programmatic access to that account's resources, consistent with the Shrtlnk API reference.

When an application sends a request to the Shrtlnk API, the API key must be included in the request headers. The Shrtlnk server then validates this key against its records. If the key is valid and active, the request is processed; otherwise, it is rejected, typically with an HTTP 401 Unauthorized or 403 Forbidden status code. This mechanism ensures that only legitimate applications with valid credentials can interact with an account's data.

The API key model is a common and effective method for authenticating server-to-server or application-to-server communications, particularly for services where the API consumer is a known entity. It avoids the complexities of OAuth 2.0 flows when user delegation isn't the primary concern, while still offering a secure way to control access when properly managed.

Supported authentication methods

Shrtlnk primarily supports API key authentication. This method is suitable for most use cases, including backend integrations, scripting, and command-line tools. The API key ensures that requests are authorized at the account level.

The following table outlines the supported authentication method, its typical use cases, and general associated security level:

API keys are generally transmitted via HTTP headers, specifically the Authorization header, for each request. This practice aligns with common API security guidelines for token-based authentication, as discussed in resources like the MDN Web Docs on HTTP Authorization headers. The keys themselves are long, alphanumeric strings designed to be difficult to guess, and they should always be transmitted over secure (HTTPS) connections to prevent interception.

Getting your credentials

To obtain an API key for Shrtlnk, you must have an active Shrtlnk account. The process involves navigating to your account dashboard and generating a key. This key is your secret and should be treated with the same care as a password.

1. Create or log in to your Shrtlnk account: If you don't already have an account, sign up on the Shrtlnk homepage. Otherwise, log in to your existing account.
2. Navigate to API Settings: Once logged in, locate the section related to API access or developer settings within your Shrtlnk dashboard. The exact path may vary slightly but typically involves a menu item like "API Keys" or "Developer Settings." Consult the Shrtlnk documentation for the most current navigation path.
3. Generate a new API Key: Within the API settings, there will be an option to generate a new API key. Click this button to create your unique key. Some platforms allow you to name your keys for easier management, especially if you plan to use multiple keys for different applications.
4. Securely store your API Key: Once generated, the API key will usually be displayed only once. Copy it immediately and store it securely. Do not embed it directly into client-side code, commit it to version control, or share it unnecessarily. If you lose your key, you will need to generate a new one and update any applications using the old key.
5. Revoke old or compromised keys: The dashboard also provides functionality to revoke existing API keys. This is a critical security measure if a key is suspected of being compromised or is no longer needed. Revoking a key immediately invalidates it, preventing any further unauthorized access.

Authenticated request example

Once you have your Shrtlnk API key, you can include it in your API requests. The Shrtlnk API expects the key to be passed in the Authorization HTTP header, prefixed with Bearer. This is a common pattern for token-based authentication.

Below is an example using curl to create a new shortened link, demonstrating how to include the API key:

curl -X POST \
  https://api.shrtlnk.dev/v1/link \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -d '{ "url": "https://www.example.com/long-url-to-shorten" }'

In this example:

• YOUR_API_KEY should be replaced with the actual API key you generated from your Shrtlnk dashboard.
• The -H 'Authorization: Bearer YOUR_API_KEY' part adds the necessary authentication header.
• The -H 'Content-Type: application/json' header specifies that the request body is in JSON format.
• The -d '{ "url": "https://www.example.com/long-url-to-shorten" }' provides the payload for creating a new link, with url being the target long URL.

For programmatic access, here's an example in Python using the requests library:

import requests
import os

api_key = os.getenv('SHRTLNK_API_KEY') # It's best practice to load from environment variables
api_url = "https://api.shrtlnk.dev/v1/link"
long_url = "https://www.another-example.com/very-long-path/to/resource"

headers = {
    "Content-Type": "application/json",
    "Authorization": f"Bearer {api_key}"
}

payload = {
    "url": long_url
}

try:
    response = requests.post(api_url, headers=headers, json=payload)
    response.raise_for_status()  # Raises an HTTPError for bad responses (4xx or 5xx)
    print("Shortened link created successfully:")
    print(response.json())
except requests.exceptions.HTTPError as e:
    print(f"HTTP error occurred: {e}")
    print(f"Response body: {response.text}")
except requests.exceptions.RequestException as e:
    print(f"An error occurred during the request: {e}")

This Python example demonstrates how to set up the headers and payload for a POST request. It also includes error handling and encourages loading the API key from an environment variable, which is a key security practice.

Security best practices

Proper management of Shrtlnk API keys is crucial to prevent unauthorized access to your account and data. Adhering to security best practices helps protect your integrations and maintain data integrity.

1. Keep API keys confidential: Treat your API key as you would a password. Never hardcode it directly into client-side code (e.g., JavaScript running in a browser), commit it to public version control systems (like GitHub), or expose it in publicly accessible files.
2. Use environment variables: For server-side applications, store your API key in environment variables rather than directly in your code. This isolates the sensitive information from the codebase and allows for easier rotation without code changes. For instance, in Unix-like systems, you might use export SHRTLNK_API_KEY="your_key_here".
3. Transmit over HTTPS only: Shrtlnk's API endpoints should always be accessed via HTTPS (https://api.shrtlnk.dev). This encrypts all communication between your application and the Shrtlnk servers, preventing attackers from intercepting your API key or other sensitive data in transit. This is fundamental for API security, as detailed in Cloudflare's explanation of HTTPS.
4. Implement IP whitelisting (if available): Check if Shrtlnk provides functionality for IP whitelisting, where you can restrict API key usage to specific IP addresses. If available, enable this feature to add an extra layer of security, ensuring only requests originating from trusted servers can use your key.
5. Rotate API keys regularly: Periodically generate a new API key and replace the old one in your applications. This reduces the window of opportunity for an attacker if a key is ever compromised. The frequency depends on your security policy and risk assessment.
6. Monitor API key usage: If Shrtlnk provides logs or metrics related to API key usage, monitor these for any unusual activity. Spikes in requests, requests from unexpected locations, or frequent authentication failures could indicate a compromise.
7. Revoke compromised or unused keys: Immediately revoke any API key that you suspect has been compromised. Also, revoke keys that are no longer in use to minimize the attack surface. The Shrtlnk dashboard should provide functionality for key revocation.
8. Least privilege principle: If Shrtlnk were to introduce granular permissions for API keys in the future, always assign the minimum necessary permissions to each key. For example, if an application only needs to create links, it shouldn't have permissions to delete them.