Testing the Cloudflare D1 REST API with Hurl: A Practical Guide.

Testing the Cloudflare D1 REST API with Hurl: A Practical Guide.

Cloudflare’s D1 database is a powerful serverless SQL solution designed for the modern web. But once you’ve set up your database, how do you test its API endpoints efficiently? Enter Hurl, a lightweight command-line tool for making HTTP requests and validating responses.

In this guide, we’ll walk through how to test Cloudflare D1’s REST API using Hurl. Whether you're a developer looking to automate API checks or a DevOps engineer ensuring reliability, this approach will save you time and headaches.

Why Use Hurl for Testing Cloudflare D1?

Before diving in, let’s clarify why Hurl is a great fit:

·         Simple Syntax: Unlike verbose testing frameworks, Hurl uses a clean, human-readable format.

·         Declarative Assertions: Easily check response status codes, headers, and JSON bodies.

·         Command-Line Friendly: Perfect for CI/CD pipelines and local development.

·         Lightweight: No complex dependencies—just plain HTTP requests with validations.

Cloudflare D1 provides a REST API for querying and managing databases, making it a natural candidate for Hurl-based testing.

Setting Up Cloudflare D1

Before testing, ensure you have:

·         A Cloudflare account with D1 enabled.

·         A D1 database created (either via the Cloudflare Dashboard or wrangler d1 CLI).

·         An API token with permissions to query the database.

For this example, let’s assume we have a simple tasks table:

sql

CREATE TABLE tasks (id INTEGER PRIMARY KEY, title TEXT, completed BOOLEAN);

INSERT INTO tasks (title, completed) VALUES ('Learn Hurl', false);

Writing Hurl Tests for D1

Basic Query Test

Let’s start with a simple GET request to fetch tasks. Save this as test_get_tasks.hurl:

hurl

GET https://api.cloudflare.com/client/v4/accounts/{account_id}/d1/database/{database_id}/query

Authorization: Bearer {{API_TOKEN}}

Content-Type: application/json

 

{

"sql": "SELECT * FROM tasks;"

}

 

# Assertions

HTTP 200

[Asserts]

jsonpath "$.result[0].title" == "Learn Hurl"

Breaking it down:

·         The GET request sends a SQL query to D1’s REST API.

·         The Authorization header uses a bearer token (replace {API_TOKEN}).

·         We assert that the response status is 200 and the first task’s title matches.

Running the Test

Install Hurl (if you haven’t already):

bash

brew install hurl  # macOS

# Or see https://hurl.dev for other platforms

Then execute:

bash

hurl --variable API_TOKEN=your_token_here test_get_tasks.hurl

If everything works, you’ll see a success message. If not, Hurl provides clear error details.

Advanced Testing Scenarios

Testing INSERT Statements

To verify writes, let’s test an INSERT operation:

hurl

POST https://api.cloudflare.com/client/v4/accounts/{account_id}/d1/database/{database_id}/query

Authorization: Bearer {{API_TOKEN}}

Content-Type: application/json

 

{

"sql": "INSERT INTO tasks (title, completed) VALUES ('Write tests', true);"

}

 

# Assertions

HTTP 200

[Asserts]

jsonpath "$.success" == true

Parameterized Queries

For dynamic inputs, use Hurl’s variable system:

hurl

POST https://api.cloudflare.com/client/v4/accounts/{account_id}/d1/database/{database_id}/query

Authorization: Bearer {{API_TOKEN}}

Content-Type: application/json

 

{

"sql": "INSERT INTO tasks (title, completed) VALUES ('{{task_name}}', {{is_complete}});",

"params": ["Finish docs", false]

}

 

# Assertions

HTTP 200

Run with:

bash

hurl --variable task_name="Finish docs" --variable is_complete=false test_insert.hurl

Best Practices for Reliable Tests

1.       Isolate Test Data: Use transactions or temporary tables to avoid polluting production data.

2.       Check Error Responses: Test invalid queries to ensure proper error handling.

3.       Use Variables Securely: Store secrets (like API tokens) in environment variables.

4.       Integrate with CI/CD: Run Hurl tests in GitHub Actions or similar pipelines.

Final Thoughts

Hurl is a fantastic tool for testing Cloudflare D1’s REST API—simple, fast, and powerful. By combining D1’s serverless SQL capabilities with Hurl’s declarative testing, you can ensure your database interactions are reliable before deploying to production.

Next Steps:

·         Explore Hurl’s documentation for more advanced features.

·         Check out Cloudflare’s D1 API reference for additional endpoints.

Happy testing! 🚀