cURL Command Builder - Free Online Tool | PivaBox

Visually build curl commands — choose method, headers, auth, body, and get the ready-to-run curl command

cURL Command Builder — Visually Construct HTTP Requests with Method Selection, Headers, Authentication, Request Body, and One-Click Copy to Terminal

1. Select your HTTP method from the dropdown (GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS) and enter the full API endpoint URL. The method choice determines what other options are available — POST, PUT, and PATCH enable the request body section, while GET and HEAD focus on headers and query parameters. cURL (Client URL) is the most widely used command-line HTTP client, available by default on macOS, Linux, and Windows 10+, and is the universal language for sharing API requests in documentation, bug reports, and support tickets.
2. Configure request details through the structured form sections. Authentication: choose between None, Basic Auth (provides a Base64-encoded username:password header), or Bearer Token (adds an Authorization: Bearer <token> header — the standard for OAuth 2.0 and JWT-based APIs). Headers: add custom HTTP headers as key-value pairs (Content-Type, Accept, User-Agent, X-API-Key, etc.) — the builder automatically includes common header presets. Request Body: for methods that support it, enter JSON, form-encoded, or raw text body content. Options: toggle flags like --location (follow redirects), --insecure (skip SSL verification — use with caution), and --verbose (detailed output for debugging).
3. Review the generated cURL command displayed at the bottom — it updates in real-time as you modify any setting. Click Copy to copy the complete command to your clipboard, then paste it directly into your terminal to execute. The builder formats the command with proper escaping, line continuation characters (\), and correct flag ordering. Use this builder to: prototype API calls before writing code, generate reproducible test commands for bug reports, create documentation examples for REST APIs, and share exact HTTP request configurations with teammates. All command construction happens entirely in your browser — your API URLs and credentials never leave your device.

Frequently Asked Questions

How does the cURL builder handle authentication securely — are my credentials safe?

Yes, your credentials are completely safe because the cURL Command Builder runs entirely in your browser with zero server communication. When you enter a password for Basic Auth or a Bearer token, that value exists only in your browser's memory and is used solely to construct the cURL command string displayed to you — it is never transmitted anywhere, never stored, and cleared when you close the tab. However, be aware that the generated cURL command itself contains your credentials in plain text (this is how cURL works — the <code>-u user:pass</code> flag or <code>Authorization</code> header value is visible in the command). When sharing the generated command with others, always redact credentials first. For production use, consider using environment variables with <code>-u $USER:$PASS</code> or reading tokens from a file with <code>$(cat token.txt)</code> instead of hardcoding secrets. PivaBox processes everything client-side — your API keys, tokens, and passwords never touch our servers.

Why use cURL instead of GUI tools like Postman or Insomnia for API testing?

cURL offers distinct advantages that make it the preferred tool in many scenarios: (1) <strong>Universality</strong> — cURL is pre-installed on virtually every Unix-like system and available on Windows; there's no installation, no sign-up, no project files. (2) <strong>Scriptability</strong> — cURL commands integrate directly into shell scripts, CI/CD pipelines, cron jobs, and Makefiles — you can't put Postman in a cron job. (3) <strong>Reproducibility</strong> — a cURL command is a single line of text that can be copied into documentation, Slack messages, GitHub issues, or Stack Overflow answers and executed immediately by the recipient. (4) <strong>Precision</strong> — cURL gives you exact control over every aspect of the HTTP request without GUI abstractions hiding details. (5) <strong>Server environments</strong> — when debugging API issues on a remote server via SSH, cURL is often the only HTTP client available. The PivaBox cURL Builder bridges the gap between GUI convenience and cURL precision — build visually, execute via command line.

Does the generated cURL command work on Windows Command Prompt, PowerShell, and Unix shells equally?

The generated command targets Unix-like shells (bash, zsh, fish on macOS and Linux) which use single quotes for string values and backslash (<code>\</code>) for line continuation. On <strong>Windows Command Prompt (cmd.exe)</strong>, you'll need to replace single quotes with double quotes and remove backslash line continuations, or better yet, use <strong>Git Bash</strong> or <strong>WSL (Windows Subsystem for Linux)</strong> which support the command exactly as generated. On <strong>PowerShell</strong>, cURL is actually an alias for <code>Invoke-WebRequest</code> by default — use <code>curl.exe</code> explicitly to run the real cURL, or remove the <code>curl</code> alias with <code>Remove-Item Alias:curl</code>. For maximum cross-platform compatibility, the tool uses single-quoted strings which work on all major Unix shells and Git Bash. Future updates may include a Windows CMD output mode.