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HTTP Client & cURL Convsta

Build, send, and inspect HTTP requests. Generate cURL commands instantly — works like Postman, runs in your browser.

Request

No body for this request.

Response

Hit ▶ Send to make a request

Generated cURL Command

⚠ Browser CORS Limitations: Requests to servers without CORS headers will be blocked by your browser's security policy. This is expected behavior — it's not a bug in this tool. To bypass CORS during development, run npx http-server locally, or test against APIs that explicitly allow browser requests (most public REST APIs do). The generated cURL command always works from your terminal regardless of CORS.

How to Use This HTTP Client

1️⃣

Set Method & URL

Choose your HTTP method (GET, POST, etc.) and enter the full API endpoint URL.

2️⃣

Add Headers & Body

Add authentication, custom headers, and a request body (JSON, form-data, or raw).

3️⃣

Copy cURL or Send

Copy the generated cURL command to run in your terminal, or hit Send to get a live response.

4️⃣

Inspect Response

View status code, response time, formatted body, and all response headers.

Frequently Asked Questions

About cURL Command Builder

This tool is a visual HTTP client and cURL command generator that works entirely in your browser. Select your HTTP method, enter the endpoint URL, configure query parameters, headers, authentication, and a request body — then either fire the request live or copy the generated cURL command to run in your terminal.

Your API keys, tokens, and request data are never sent to Convsta servers — they travel only to the URL you specify. The tool is a lightweight alternative to Postman or Insomnia for quick API testing without installing anything.

Common Use Cases

Quickly testing a REST API endpoint with Bearer token auth without opening a full API client
Converting a visually-built request into a shareable cURL command for documentation or bug reports
Inspecting response status codes, timing, body size, and response headers in one view
Generating Windows CMD-compatible cURL commands when working across different operating systems

How to Use

Choose an HTTP method from the dropdown and paste your endpoint URL into the address bar
Add query parameters, headers, or a request body using the tabs in the Request panel
Select an auth type (Bearer, Basic, or API Key) from the Auth tab if your endpoint requires it
Click "Send" to execute the request live, or copy the generated cURL command at the bottom to run in your terminal

Frequently Asked Questions

Why does my request return a CORS error in the browser?

CORS (Cross-Origin Resource Sharing) is enforced by browsers, not by the server responding to your request. If the server does not return an Access-Control-Allow-Origin header, the browser blocks the response. The generated cURL command at the bottom is not subject to CORS and will always work from your terminal.

How do I send a JSON body with a POST request?

Select POST from the method dropdown, click the "Body" tab in the Request panel, choose "JSON" from the body type buttons, and paste your JSON payload. The tool automatically sets the Content-Type: application/json header when you send or generate cURL.

Is the Windows CMD version of cURL different?

Yes. Windows Command Prompt requires double quotes instead of single quotes and does not support the backslash line-continuation character. The "Windows CMD" button generates a single-line version of the command with double quotes, ready to paste into CMD or PowerShell.