Transport for Sweden Authentication: API Key Access (2026)

Authentication overview

Transport for Sweden's APIs, managed through the Trafiklab platform, primarily utilize API keys for authentication. These keys serve as unique identifiers that grant access to various datasets and services, such as Resrobot for journey planning or Trafikinfo for real-time traffic updates. The authentication process verifies the identity of the application or developer making a request, ensuring that only authorized users consume the API resources and adhere to usage limits. API keys are suitable for server-to-server communication and applications where the key can be securely stored and managed.

Trafiklab's system associates each API key with a registered user account and a specific API service. This allows for granular control over access and usage monitoring. Different APIs might have slightly varied integration instructions for their respective API keys, but the fundamental principle remains consistent: an API key must be presented with each request to gain access. This approach simplifies client-side implementation compared to more complex protocols like OAuth 2.0, while still providing a basic layer of security and access management for data consumption.

For detailed instructions on obtaining and using API keys for specific Transport for Sweden APIs, refer to the Trafiklab API documentation.

Supported authentication methods

Transport for Sweden's APIs, accessed via Trafiklab, primarily rely on API key authentication. This method involves generating a unique string (the API key) that applications include in their API requests. The Trafiklab platform validates this key to grant access and enforce usage policies.

While API keys are the standard for most Trafiklab services, the platform's infrastructure supports the potential for other authentication mechanisms in the future, particularly for specific use cases requiring higher security or user delegation. However, as of 2026, API keys remain the primary and recommended method for accessing the majority of Transport for Sweden's public data APIs.

API Key

An API key is a token that a client provides when making API calls. It identifies the calling project and provides authorization. The key is typically a long, alphanumeric string that is generated through the Trafiklab developer portal.

When to use: API keys are suitable for identifying an application or project making requests to the API. They are commonly used for accessing public data APIs where user-specific authorization is not required, or where the application itself is the principal actor. This method is effective for server-side applications or clients where the API key can be stored securely and not exposed to end-users.

Security considerations: API keys should be treated as sensitive credentials. Their exposure can lead to unauthorized access and potential abuse of API resources. Best practices include restricting API keys by IP address or HTTP referrer, rotating keys regularly, and avoiding embedding them directly in client-side code where they could be easily extracted. For robust security, Transport Layer Security (TLS/SSL) — ensuring HTTPS for all API calls — is critical to protect API keys in transit from eavesdropping (Mozilla TLS documentation).

Getting your credentials

To obtain API keys for Transport for Sweden's APIs via Trafiklab, follow these steps:

1. Register on Trafiklab: Navigate to the Trafiklab website and complete the registration process. This typically involves providing your email address, creating a password, and agreeing to their terms of service.
2. Log in to your account: Once registered, log in to the Trafiklab developer portal.
3. Browse available APIs: Explore the list of available APIs. Transport for Sweden offers various services, including those for real-time traffic information, journey planning, and public transport data.
4. Subscribe to an API: For each API you wish to use, you will typically need to subscribe to it. This process often involves selecting a usage plan (e.g., free tier for non-commercial use, or a commercial tier starting at 1000 SEK/month for commercial use).
5. Generate API Key: After subscribing, the Trafiklab portal will provide you with an API key specific to that service. This key is usually displayed on your dashboard or within the API's specific documentation section. Make sure to copy and store this key securely immediately.
6. Review usage limits: Each API key is often associated with specific rate limits and usage quotas. Familiarize yourself with these limits to avoid unexpected service interruptions.

It's important to note that API keys are typically unique to each API service you subscribe to. If you plan to use multiple Transport for Sweden APIs, you may need to obtain separate keys for each.

Authenticated request example

The method for including your API key in a request can vary slightly depending on the specific Transport for Sweden API you are using. Generally, API keys are passed either as a query parameter in the URL or as a custom HTTP header. Always consult the specific API's documentation on Trafiklab for the exact parameter or header name.

Below is a generic example demonstrating how to make an authenticated request using an API key as a query parameter, which is a common approach for many Trafiklab APIs. Replace YOUR_API_KEY with your actual key and your_api_endpoint with the relevant API URL.

Using cURL (API Key as Query Parameter)

curl -X GET \
  "https://api.trafiklab.se/your_api_endpoint?key=YOUR_API_KEY&param1=value1"

In this example, key is the placeholder for the API key parameter name. Some APIs might use APIKey, apiKey, or other specific names. Always refer to the particular API's documentation for the correct parameter name.

Using Python (API Key as Query Parameter)

import requests

api_key = "YOUR_API_KEY"
api_endpoint = "https://api.trafiklab.se/your_api_endpoint"

params = {
    "key": api_key,  # Replace 'key' if the API uses a different parameter name
    "param1": "value1"
}

try:
    response = requests.get(api_endpoint, params=params)
    response.raise_for_status()  # Raise an exception for HTTP errors
    print(response.json())
except requests.exceptions.HTTPError as err:
    print(f"HTTP error occurred: {err}")
except Exception as err:
    print(f"An error occurred: {err}")

Using cURL (API Key as HTTP Header)

If an API requires the key to be sent as an HTTP header (e.g., Authorization header or a custom header), the request would look like this:

curl -X GET \
  -H "Authorization: Apikey YOUR_API_KEY" \
  "https://api.trafiklab.se/your_api_endpoint?param1=value1"

In this example, Authorization: Apikey is used. The header name and value prefix (e.g., Apikey, Bearer, or none) will be specified in the API's documentation.

Security best practices

Securing your API keys for Transport for Sweden's APIs is crucial to prevent unauthorized access, maintain service integrity, and avoid potential billing issues for commercial tiers. Adhere to these best practices:

• Use HTTPS exclusively: Always communicate with Trafiklab APIs over HTTPS. This encrypts your requests, including the API key, protecting it from interception during transit. Unencrypted HTTP requests will expose your API key to potential eavesdropping.
• Store API keys securely: Never embed API keys directly in client-side code (e.g., JavaScript in a web browser) or commit them to version control systems like Git. Instead, store them in environment variables, secret management services (like AWS Secrets Manager or Google Cloud Secret Manager), or secure configuration files on your server. For local development, use a .env file that is excluded from version control.
• Restrict API key usage: If Trafiklab or your infrastructure allows, restrict API keys by IP address or HTTP referrer. This ensures that even if a key is compromised, it can only be used from pre-approved locations or domains, significantly limiting its utility to an attacker.
• Rotate API keys regularly: Periodically generate new API keys and replace old ones. This practice reduces the window of opportunity for a compromised key to be exploited. The recommended rotation frequency can depend on your security policy and the sensitivity of the data accessed.
• Implement rate limiting on your side: While Trafiklab enforces its own rate limits, implementing client-side rate limiting can help prevent accidental overuse of your API quota and reduce the impact of a compromised key if an attacker attempts a denial-of-service attack using your credentials.
• Monitor API usage: Regularly review your API usage logs and metrics provided by Trafiklab. Anomalous usage patterns can indicate a compromised key or an issue with your application, allowing you to react quickly.
• Follow the Principle of Least Privilege: If Trafiklab offers different types of API keys or access scopes, use the key with the minimum necessary permissions for your application's functionality. This limits the damage if a key is compromised.
• Error handling: Implement robust error handling in your application for API requests. Specifically, handle authentication errors (e.g., HTTP 401 Unauthorized or 403 Forbidden) gracefully, logging them for review without exposing sensitive information to end-users.

Adhering to these practices fortifies the security posture of your integration with Transport for Sweden's APIs and protects your application and data (Google Cloud security best practices).