How to use cURL in PowerShell

In today’s IT and cybersecurity environments, command-line tools for interacting with web services are indispensable. cURL (Client URL) is one of the most versatile utilities available, allowing administrators and developers to transfer data, test APIs, download files, and automate network interactions.

Traditionally a staple of Linux and macOS environments, cURL has gained popularity in Windows systems. In Windows, and specifically PowerShell, there’s a nuance: typing curl doesn’t always invoke the cURL binary—it often triggers a PowerShell alias. Understanding this distinction is crucial for effective automation, scripting, and troubleshooting.

This guide provides an in-depth look at how to use cURL in PowerShell, the key differences between the PowerShell alias and the native cURL binary, and practical, real-world examples you can apply immediately.

What Is cURL?

cURL, short for Client URL, is a command-line tool designed to make HTTP requests and transfer data between clients and servers. It supports a wide array of protocols, including:

• HTTP and HTTPS
• FTP and FTPS
• SFTP and SCP
• LDAP
• SMTP and SMTPS

Some of its most common uses in IT environments include:

• Testing and interacting with REST APIs
• Downloading or uploading files
• Debugging HTTP requests
• Automating repetitive network tasks

Real-world insight: In security audits and penetration testing, cURL is often the first tool used to test endpoint responses, check SSL/TLS configurations, or enumerate API endpoints.

Does PowerShell Have cURL?

Yes—but with a caveat. On modern Windows systems:

• Typing curl or wget in PowerShell actually runs Invoke-WebRequest, not the standard cURL binary.
• To use the genuine cURL executable, you must run curl.exe (or install cURL via Windows Package Manager or manually).

To check what command your curl alias points to:

Get-Command curl

• If it returns Invoke-WebRequest, then PowerShell is intercepting your cURL call.
• Using curl.exe ensures cross-platform compatibility with Linux and macOS-style syntax.

Expert tip: Always verify which command is being executed, especially when following tutorials or scripts written for Linux.

Using cURL in PowerShell

PowerShell provides two primary cmdlets for web requests: Invoke-WebRequest and Invoke-RestMethod. While aliases like curl and wget point to these cmdlets, you can still use the traditional cURL binary for familiar syntax.

1. Basic Web Request

PowerShell:

curl https://example.com

This actually executes:

Invoke-WebRequest https://example.com

• Returns structured output, including headers, status code, and HTML content.

Native cURL binary:

curl.exe https://example.com

• Behaves like Linux/macOS cURL, returning raw HTML content.

2. Downloading a File

PowerShell method:

Invoke-WebRequest https://example.com/file.zip -OutFile C:\Temp\file.zip

cURL binary:

curl.exe https://example.com/file.zip -o C:\Temp\file.zip

Real-world tip: In scripts for automated nightly downloads, Invoke-WebRequest integrates better with PowerShell pipelines, allowing direct file handling without spawning external processes.

3. Sending a POST Request

PowerShell:

curl -Method POST -Uri "https://api.example.com/login" -Body @{username="admin";password="1234"}

• Uses a hashtable for key-value pairs, automatically formatted for application/x-www-form-urlencoded.

cURL binary:

curl.exe -X POST -d "username=admin&password=1234" https://api.example.com/login

• Uses traditional cURL syntax compatible across platforms.

4. Working with JSON APIs

PowerShell:

curl -Uri "https://api.example.com/data" -Headers @{Authorization="Bearer TOKEN"} | ConvertFrom-Json

• Invoke-WebRequest fetches the data; ConvertFrom-Json parses JSON into PowerShell objects.

cURL binary:

curl.exe -H "Authorization: Bearer TOKEN" https://api.example.com/data

• Returns raw JSON; manual parsing or jq (on Windows via WSL) may be needed.

Expert insight: For API automation in PowerShell, Invoke-RestMethod is often preferable because it automatically converts JSON responses into objects, simplifying scripting.

5. Uploading Files

PowerShell:

Invoke-WebRequest -Uri "https://api.example.com/upload" -Method Post -InFile "C:\Temp\file.txt" -ContentType "multipart/form-data"

cURL binary:

curl.exe -F "file=@C:\Temp\file.txt" https://api.example.com/upload

• Both methods achieve the same result, but syntax differs slightly depending on the tool.

When to Use PowerShell Cmdlets vs. cURL Binary

Pro tip: For large automation scripts, using PowerShell cmdlets avoids the overhead of invoking external binaries and makes error handling easier.

Best Practices for Using cURL in PowerShell

1. Always specify curl.exe when you want the real cURL tool.
2. Use Invoke-RestMethod for JSON APIs to take advantage of PowerShell’s object-based parsing.
3. Securely store credentials and tokens in variables or credential objects, not hard-coded strings.
4. Combine with automation scripts for health checks, nightly downloads, or API polling.
5. Test endpoints first manually to verify authentication, SSL/TLS, and response formats.
6. Check aliases periodically as PowerShell updates may override them.

Real-world tip: Many IT teams maintain a standard wrapper function in PowerShell that calls either curl.exe or Invoke-RestMethod based on the script context, ensuring consistent behavior across workstations.

Conclusion

cURL in PowerShell can be slightly confusing due to aliasing with Invoke-WebRequest, but understanding the distinction gives you flexibility:

• Use PowerShell cmdlets for structured, object-oriented scripting and easy JSON handling.
• Use cURL binary for cross-platform compatibility or when following Linux-centric tutorials.

By mastering both, IT professionals can confidently perform file transfers, test APIs, debug web requests, and automate workflows. Whether you’re a systems administrator, DevOps engineer, or cybersecurity analyst, these techniques help you leverage the full power of command-line networking tools in a Windows environment.

Final thought: For enterprise scripting and automation, building familiarity with both PowerShell cmdlets and the cURL binary ensures your scripts are robust, maintainable, and compatible across platforms.

Daniel Lutton

From my early days on the helpdesk through roles as a service desk manager, systems administrator, and network engineer, I’ve spent more than 25 years in the IT world. As I transition into cyber security, my goal is to make tech a little less confusing by sharing what I’ve learned and helping others wherever I can.