cURL is a command-line tool and library for transferring data with URLs. Originally released in 1997 by Daniel Stenberg, cURL is the de facto standard tool used by developers for testing, automating, and scripting interactions with HTTP, HTTPS, FTP, and many other URL-based protocols. It ships in two primary forms - the curl command-line binary used directly in shells and scripts, and libcurl, a portable C library that powers data transfer features inside thousands of applications, operating systems, devices, and programming languages.
cURL publishes 2 APIs on the APIs.io network. Tagged areas include API Client, Command Line, Data Transfer, FTP, and HTTP.
cURL’s developer surface includes support, engineering blog, and 8 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
Education & Research regime, so
Regulatory Posture carries 15 points of the composite.
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Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for
this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero:
never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and
several others — scorable at all.
The six quality facets above are damped to 85 points between them,
because the conditional facet above carries the other
15. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 85% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
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The curl command-line tool transfers data to or from a server using URL syntax, supporting protocols including DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDA...
libcurl is a free, easy-to-use, thread-safe, IPv6-compatible client-side URL transfer library written in C with a stable API and ABI. It supports the same broad set of protocols...
aid: curl
name: cURL
description: cURL is a command-line tool and library for transferring data with URLs. Originally released in 1997 by Daniel
Stenberg, cURL is the de facto standard tool used by developers for testing, automating, and scripting interactions with
HTTP, HTTPS, FTP, and many other URL-based protocols. It ships in two primary forms - the curl command-line binary used
directly in shells and scripts, and libcurl, a portable C library that powers data transfer features inside thousands of
applications, operating systems, devices, and programming languages.
url: https://raw.githubusercontent.com/api-evangelist/curl/refs/heads/main/apis.yml
deliveryModel:
model: library
open_source: false
commercial: false
callable_host: false
label: Library · distributed through package registries, no callable service
confidence: low
source:
- none
generated: '2026-08-28'
method: derived
accessModel:
pricing: freemium
onboarding: unknown
trial: false
try_now: false
public: false
label: Freemium
confidence: medium
source:
- plans
generated: '2026-07-22'
method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/curl.png
tags:
- API Client
- Command Line
- Data Transfer
- FTP
- HTTP
- HTTPS
- Library
- Network Tools
- Open-Source
- REST
tags_raw:
- API Client
- Command Line
- Data Transfer
- FTP
- HTTP
- HTTPS
- Library
- Network Tools
- Open Source
- REST
created: '2024-01-01'
modified: '2026-04-28'
specificationVersion: '0.23'
apis:
- aid: curl:curl-cli
name: cURL Command Line Tool
description: The curl command-line tool transfers data to or from a server using URL syntax, supporting protocols including
DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMTP,
SMTPS, TELNET, TFTP, WS and WSS. It is widely used for API testing, automation, scripting, file uploads and downloads,
debugging HTTP exchanges, and as a general-purpose network client.
image: https://curl.se/logo/curl-logo.svg
humanURL: https://curl.se/
tags:
- API Client
- API Testing
- Command Line
- Data Transfer
- FTP
- HTTP
- HTTPS
- REST
properties:
- type: Documentation
url: https://curl.se/docs/
- type: Manual
url: https://curl.se/docs/manual.html
- type: Tutorial
url: https://curl.se/docs/tutorial.html
- type: Man Page
url: https://curl.se/docs/manpage.html
- type: How To
url: https://curl.se/docs/howto.html
- type: FAQ
url: https://curl.se/docs/faq.html
- type: GitHub
url: https://github.com/curl/curl
- type: Download
url: https://curl.se/download.html
- type: ChangeLog
url: https://curl.se/changes.html
- aid: curl:libcurl
name: libcurl
description: libcurl is a free, easy-to-use, thread-safe, IPv6-compatible client-side URL transfer library written in C
with a stable API and ABI. It supports the same broad set of protocols as the curl command-line tool and is embedded in
operating systems, applications, and developer tools across nearly every platform. Bindings are available for dozens of
languages including PHP, Python, Ruby, Rust, Go, Java, .NET, and many others.
image: https://curl.se/logo/curl-logo.svg
humanURL: https://curl.se/libcurl/
tags:
- C
- HTTP Client
- Library
- SDK
- URL Transfer
properties:
- type: Documentation
url: https://curl.se/libcurl/
- type: APIReference
url: https://curl.se/libcurl/c/
- type: Examples
url: https://curl.se/libcurl/c/example.html
- type: SDKs
url: https://curl.se/libcurl/bindings.html
- type: GitHub
url: https://github.com/curl/curl
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
common:
- type: VulnerabilityDisclosure
url: security/curl-vulnerability-disclosure.yml
- type: DomainSecurity
url: security/curl-domain-security.yml
- type: LinkedIn
url: https://www.linkedin.com/company/the-curl-project
- type: Website
url: https://curl.se/
- type: Support
url: https://curl.se/support.html
- type: Mailing Lists
url: https://curl.se/mail/
- type: Security
url: https://curl.se/dev/security.html
- type: Blog
url: https://daniel.haxx.se/blog/
- type: Books
url: https://everything.curl.dev/
- type: License
url: https://curl.se/docs/copyright.html
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