For developers who live in the terminal, command-line API testing tools are indispensable. cURL has been pre-installed on virtually every Unix-like system since 1997 and as of 2023 is bundled with Windows 10+ by default — making it available on an estimated 10 billion devices. According to curl’s project website, the tool is used in over 20 billion installations across embedded devices, appliances, smartphones, and servers. HTTPie, by contrast, has surpassed 30,000 GitHub stars and is praised for its developer-friendly syntax that makes JSON APIs feel natural to query interactively. According to HTTPie’s documentation, the tool reduces the verbosity of HTTP requests by up to 70% compared to equivalent curl commands. HTTPie has accumulated over 30,000 stars on GitHub. According to the Stack Overflow Developer Survey, command-line tools remain the preferred method for over 80% of backend developers who test APIs during development. The two tools serve the same fundamental purpose — making HTTP requests from the terminal — but with fundamentally different philosophies: curl prioritizes universal compatibility and raw power, while HTTPie prioritizes readability and developer happiness.

“I keep both curl and HTTPie in my daily workflow. HTTPie for exploratory API testing where I want clean output and easy JSON syntax — curl for every automation script and CI pipeline where I need guaranteed availability with no dependencies. They’re not competing tools; they’re complements.” — Yuri Kan, Senior QA Lead

While graphical tools like Insomnia provide intuitive interfaces for API exploration, command-line tools excel in automation and scripting workflows.

For comprehensive API testing knowledge, explore our API testing mastery guide. When transitioning from manual testing to automation, Postman: From Manual to Automation shows how CLI tools complement GUI-based testing. For CI/CD integration, see CI/CD pipeline optimization for QA teams.

TL;DR — curl (pre-installed on 10B+ devices, C-based, fastest) vs HTTPie (30K+ GitHub stars, Python, human-friendly). Use HTTPie for interactive API exploration; use curl for scripts and CI/CD pipelines. Both complement each other — install both.

Introduction

cURL: The Universal Standard

Overview

cURL (Client URL) has been the de facto standard for command-line HTTP requests since 1997. It’s pre-installed on most Unix-like systems (Linux, macOS) and Windows 10+, making it universally accessible.

Basic Syntax

GET Request

curl https://api.example.com/users

POST Request

curl -X POST https://api.example.com/users \
  -H "Content-Type: application/json" \
  -d '{"name":"John","email":"john@example.com"}'

With Headers

curl -H "Authorization: Bearer token123" \
  -H "Accept: application/json" \
  https://api.example.com/profile

Save Response

curl -o response.json https://api.example.com/data

Advanced cURL Features

Follow Redirects

curl -L https://api.example.com/redirect

Include Headers in Output

curl -i https://api.example.com/users

Verbose Mode (Debugging)

curl -v https://api.example.com/users

File Upload

curl -F "file=@document.pdf" https://api.example.com/upload

Authentication

# Basic Auth
curl -u username:password https://api.example.com/secure

# Bearer Token
curl -H "Authorization: Bearer $TOKEN" https://api.example.com/api

HTTPie: The Human-Friendly Alternative

Overview

HTTPie (pronounced “aitch-tee-tee-pie”) is a modern command-line HTTP client with intuitive syntax, JSON support, and beautiful output formatting.

Basic Syntax

GET Request

http GET https://api.example.com/users
# or simply:
http https://api.example.com/users

POST Request

http POST https://api.example.com/users name=John email=john@example.com

With Headers

http https://api.example.com/profile \
  Authorization:"Bearer token123" \
  Accept:application/json

Download File

http --download https://api.example.com/file.pdf

Advanced HTTPie Features

JSON Syntax Sugar

# Simple key-value pairs become JSON
http POST https://api.example.com/users \
  name=John \
  age:=30 \
  active:=true \
  tags:='["developer","qa"]'

Form Data

http --form POST https://api.example.com/upload \
  file@document.pdf \
  description="Important document"

Sessions

# Create session
http --session=user1 POST https://api.example.com/login \
  username=john password=secret

# Reuse session (cookies, headers preserved)
http --session=user1 GET https://api.example.com/profile

Pretty Printing

# Automatic syntax highlighting and formatting
http https://api.example.com/users

# Control output format
http --print=HhBb https://api.example.com/users
# H: request headers
# B: request body
# h: response headers
# b: response body

Side-by-Side Comparison

Syntax Comparison

TaskcURLHTTPie
GETcurl https://api.com/usershttp GET https://api.com/users
POST JSONcurl -X POST -H "Content-Type: application/json" -d '{"name":"John"}' https://api.com/usershttp POST https://api.com/users name=John
Headerscurl -H "Auth: token" https://api.comhttp https://api.com Auth:token
Query Paramscurl "https://api.com/search?q=test&page=1"http GET https://api.com/search q==test page==1
File Uploadcurl -F "file=@doc.pdf" https://api.com/uploadhttp --form POST https://api.com/upload file@doc.pdf

Real Example: Create User

cURL

curl -X POST https://api.example.com/users \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer abc123" \
  -d '{
    "name": "Jane Doe",
    "email": "jane@example.com",
    "age": 28,
    "active": true,
    "roles": ["user", "moderator"]
  }'

HTTPie

http POST https://api.example.com/users \
  Authorization:"Bearer abc123" \
  name="Jane Doe" \
  email=jane@example.com \
  age:=28 \
  active:=true \
  roles:='["user","moderator"]'

Scripting and Automation

Command-line tools are essential components of a comprehensive API testing strategy, particularly for automation and continuous integration workflows.

Bash Scripts with cURL 

#!/bin/bash

# Configuration
API_BASE="https://api.example.com"
TOKEN="your-api-token"

# Function to make authenticated requests
api_call() {
  local method=$1
  local endpoint=$2
  local data=$3

  curl -X "$method" "$API_BASE$endpoint" \
    -H "Authorization: Bearer $TOKEN" \
    -H "Content-Type: application/json" \
    -d "$data"
}

# Login and get token
TOKEN=$(curl -X POST "$API_BASE/auth/login" \
  -H "Content-Type: application/json" \
  -d '{"username":"admin","password":"secret"}' | \
  jq -r '.access_token')

# Use token for subsequent requests
api_call GET "/users"
api_call POST "/users" '{"name":"Test User","email":"test@example.com"}'

Bash Scripts with HTTPie 

#!/bin/bash

API_BASE="https://api.example.com"

# Login and extract token
TOKEN=$(http POST "$API_BASE/auth/login" \
  username=admin password=secret | \
  jq -r '.access_token')

# Make authenticated requests
http GET "$API_BASE/users" "Authorization:Bearer $TOKEN"
http POST "$API_BASE/users" "Authorization:Bearer $TOKEN" \
  name="Test User" email=test@example.com

CI/CD Integration

GitHub Actions with cURL 

name: API Tests
on: [push]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:

      - name: Test API Health
        run: |
          response=$(curl -s -o /dev/null -w "%{http_code}" https://api.example.com/health)
          if [ $response -ne 200 ]; then
            echo "API health check failed"
            exit 1
          fi

      - name: Test User Creation
        run: |
          curl -X POST https://api.example.com/users \
            -H "Authorization: Bearer ${{ secrets.API_TOKEN }}" \
            -H "Content-Type: application/json" \
            -d '{"name":"CI User","email":"ci@example.com"}' \
            --fail-with-body

GitLab CI with HTTPie 

api_tests:
  stage: test
  image: alpine:latest
  before_script:

    - apk add --no-cache httpie jq
  script:

    - http GET https://api.example.com/health --check-status
    - |
      http POST https://api.example.com/users \
        Authorization:"Bearer $API_TOKEN" \
        name="CI User" \
        email=ci@example.com \
        --check-status

Best Practices

Error Handling

cURL

# Check HTTP status code
http_code=$(curl -s -o /dev/null -w "%{http_code}" "$URL")
if [ "$http_code" -ne 200 ]; then
  echo "Request failed with status $http_code"
  exit 1
fi

# Fail on HTTP errors
curl --fail-with-body "$URL"

# Retry on failure
curl --retry 3 --retry-delay 5 "$URL"

HTTPie

# Exit with error on HTTP error statuses
http --check-status GET https://api.example.com/users

# Download with progress and resume
http --download --continue https://api.example.com/large-file.zip

Environment Variables 

# .env file
API_BASE_URL=https://api.example.com
API_TOKEN=your-secret-token

cURL

source .env
curl -H "Authorization: Bearer $API_TOKEN" "$API_BASE_URL/users"

HTTPie

source .env
http "$API_BASE_URL/users" "Authorization:Bearer $API_TOKEN"

Response Processing

With jq (JSON processor)

# cURL + jq
curl https://api.example.com/users | jq '.[] | select(.active == true) | .email'

# HTTPie + jq (although HTTPie has built-in formatting)
http https://api.example.com/users | jq '.[] | select(.active == true) | .email'

Performance Comparison

Speed: cURL is generally faster (C-based) vs HTTPie (Python-based) Memory: cURL uses less memory Startup Time: cURL is nearly instant, HTTPie has slight Python overhead

For most API testing, the difference is negligible. Use HTTPie for interactive use, cURL for performance-critical automation.

When to Use Each

Use cURL When:

  • ✓ Maximum compatibility required
  • ✓ Scripting for production systems
  • ✓ Minimal dependencies needed
  • ✓ Performance is critical
  • ✓ System doesn’t have HTTPie installed

Use HTTPie When:

  • ✓ Interactive API exploration
  • ✓ Developer experience matters
  • ✓ Working primarily with JSON APIs
  • ✓ Readability of scripts important
  • ✓ Can install additional tools

Conclusion

Both cURL and HTTPie are excellent tools with different strengths:

cURL: Universal, fast, ubiquitous, powerful HTTPie: Modern, readable, user-friendly, JSON-focused

For most developers, the ideal setup is:

  • HTTPie for daily interactive API testing
  • cURL for scripts and automation where portability matters

Learn both—they complement each other perfectly in a comprehensive API testing toolkit. When comparing different API testing tools in 2025, command-line options like cURL and HTTPie remain essential alongside modern alternatives like REST Assured for Java-based automation.

Frequently Asked Questions

What is the difference between curl and HTTPie? curl is a universal command-line tool for HTTP requests, pre-installed on most systems (Linux, macOS, Windows 10+), written in C for maximum performance. HTTPie is a Python-based alternative with human-friendly syntax, automatic JSON formatting, and colorized output — better for interactive use, while curl is preferred for scripts and CI/CD.

Is HTTPie faster than curl? No, curl is generally faster than HTTPie. curl is written in C and has near-instant startup time, while HTTPie has slight Python startup overhead. For automation scripts and performance-critical tasks, curl is the better choice.

How do I install HTTPie? Install HTTPie with: pip install httpie (Python/pip), brew install httpie (macOS), apt install httpie (Ubuntu/Debian), or snap install httpie (Linux).

Can curl be used in CI/CD pipelines? Yes, curl is ideal for CI/CD pipelines because it’s pre-installed on virtually every CI runner (GitHub Actions, GitLab CI, Jenkins) with no additional setup. Use --fail-with-body to exit with an error on HTTP failures, and --retry for transient network issues.

Sources: HTTPie Documentation · curl Documentation · curl project statistics

Official Resources

See Also