When I first started testing APIs, my workflow looked a lot like everyone else's. I'd open a GUI tool, create a request, click Send, inspect the response, make a few changes, and repeat the process until everything worked.
It got the job done, but it wasn't exactly efficient.
As my projects became more complex, I found myself spending more time in the terminal than in graphical applications. Running scripts, managing containers, deploying services, and automating repetitive tasks all happened from the command line. Naturally, API testing became part of that workflow too.
Today, terminal-based API testing isn't just for Linux enthusiasts or DevOps engineers. It's become a practical choice for backend developers, platform engineers, QA teams, and even AI-assisted development. Whether you're running tests inside a CI/CD pipeline, debugging an API over SSH, or asking an AI coding assistant to validate endpoints, command-line tools often provide a faster and more flexible experience than switching between multiple windows.
The good news is that there are more terminal-based API testing tools available than ever before. Some are lightweight utilities designed for quick HTTP requests, while others provide complete API lifecycle management directly from the command line.
In this article, I'll share ten of the best terminal-based API testing tools worth exploring in 2026, starting with five that have become staples in modern developer workflows.
Why More Developers Are Testing APIs from the Terminal
Graphical API clients remain incredibly useful, but command-line tools offer several advantages that are becoming increasingly important.
For one, they're easier to automate. Instead of manually clicking through requests, developers can run API tests as part of build pipelines, deployment workflows, or scheduled jobs.
Terminal tools also integrate naturally with modern development environments. Whether you're using GitHub Actions, Docker, Kubernetes, or an AI coding assistant like Claude Code or Codex, working from the command line keeps everything in one place.
They're also ideal for remote development. If you're connected to a server over SSH or working inside a cloud development environment, launching a desktop application isn't always practical.
Perhaps most importantly, terminal-based tools encourage repeatable workflows. Commands can be saved in scripts, committed to version control, and shared across teams, making API testing more consistent and less dependent on individual setups.
What Makes a Good Terminal-Based API Testing Tool?
Not every command-line utility is built for API testing. For this list, I looked at the qualities that matter most in everyday development.
Ease of Use
A good CLI should make common tasks simple. Clear commands, readable output, and sensible defaults help developers stay productive.
Automation Support
Modern API testing should fit naturally into CI/CD pipelines, shell scripts, and automated workflows.
Protocol Support
REST remains the most common API style, but many developers also work with GraphQL, gRPC, and WebSockets.
Authentication
Support for API keys, Bearer tokens, OAuth, and custom headers makes a tool practical for real-world APIs.
Developer Experience
The best tools reduce friction rather than adding it. Helpful error messages, readable output, and good documentation all contribute to a better experience.
1. Apidog CLI
What it is
Apidog CLI extends the Apidog platform into the command line, allowing developers to manage API resources, execute automated tests, validate schemas, and interact with API projects without leaving the terminal. Rather than focusing only on sending HTTP requests, it brings much of the API development lifecycle into a command-line workflow.
When to use it
Apidog CLI is an excellent choice for teams that want to automate API testing while also managing documentation, environments, schemas, and API resources from the same workflow.
For example, imagine a development team working on a microservices application. Developers can validate endpoint definitions before committing changes, QA engineers can execute automated test scenarios during every deployment, and DevOps teams can integrate API testing directly into GitHub Actions or Jenkins. Instead of juggling several tools, much of the workflow can be handled through the terminal.
It's also well suited for AI-assisted development. Since AI coding agents increasingly interact with command-line tools, having API management capabilities available through a CLI makes it easier to automate repetitive tasks.
Key Features
- Automated API testing
- API resource management
- Schema validation
- Test scenario orchestration
- Environment and variable management
- Documentation publishing
- Import and export in multiple formats
- CI/CD integration
- Branch collaboration
Why it stands out
Unlike many terminal tools that focus only on making requests, Apidog CLI supports a much broader API lifecycle. Developers can move from API design to testing, validation, and documentation without leaving the command line, making it particularly attractive for teams embracing automation.
2. HTTPie
What it is
HTTPie is one of the most popular command-line HTTP clients available today. It provides a more human-friendly alternative to curl, with cleaner syntax, automatic formatting, and readable JSON output.
When to use it
HTTPie is ideal for developers who frequently test REST APIs during development. Suppose you're building a backend service and want to quickly verify an endpoint before pushing your code. Instead of constructing a long curl command, HTTPie lets you send requests using commands that are easier to read and remember.
It's also a great learning tool for developers who are new to working with APIs because the commands closely resemble natural HTTP requests.
Key Features
- Simple command syntax
- Automatic JSON formatting
- Authentication support
- File uploads
- Sessions
- Colorized output
- Plugin ecosystem
- HTTPS support
Why it stands out
HTTPie strikes an excellent balance between simplicity and functionality. It offers much of the flexibility developers expect from command-line tools while remaining approachable enough for everyday use.
3. curl
What it is
curl is arguably the most recognized command-line tool for transferring data over HTTP and many other protocols. It has been part of developer workflows for decades and remains a standard utility on most operating systems.
When to use it
If you're working on servers, containers, or cloud environments, chances are curl is already installed. That makes it perfect for quick API checks, debugging production issues, or writing shell scripts that interact with REST APIs.
For example, if a deployment suddenly starts returning errors, a developer can SSH into the server and immediately test an endpoint without installing additional software.
Key Features
- HTTP and HTTPS support
- Multiple protocol support
- Authentication
- File uploads
- Custom headers
- Proxy support
- Cookie handling
- Script automation
Why it stands out
Its biggest strength is availability. Because curl is installed almost everywhere, it's often the first tool developers reach for when they need to quickly test an API from the terminal.
4. hurl
What it is
hurl is a command-line tool specifically designed for testing HTTP APIs using simple, text-based request files. Instead of writing complex shell scripts, developers can define requests and expected responses in an easy-to-read format.
When to use it
hurl is especially useful for automated API testing and regression testing. Imagine maintaining an authentication API with dozens of endpoints. Rather than manually checking every response after each release, you can store test definitions in version control and execute them automatically whenever the application changes.
Because requests are stored as plain text, they're easy to review during pull requests and collaborate on with teammates.
Key Features
- Text-based request files
- Response assertions
- HTTP testing
- JSON validation
- CI/CD integration
- Script-friendly
- Version control friendly
- Lightweight installation
Why it stands out
hurl combines the readability of configuration files with the power of automated testing, making it a favorite among developers who treat API tests as code.
5. Bruno CLI
What it is
Bruno CLI extends the Bruno API client into terminal-based workflows. Built around a Git-first philosophy, Bruno stores API collections locally as plain text rather than relying on cloud synchronization.
When to use it
Bruno CLI works particularly well for teams that want API requests and tests to live alongside application code. For example, a backend development team can keep API collections inside the same Git repository as the project itself. Changes to requests, environments, and test definitions can then be reviewed through normal pull requests, creating a transparent development workflow.
This local-first approach also appeals to developers who prefer not to store API collections on external services.
Key Features
- Git-first workflow
- Local API collections
- Terminal execution
- Environment management
- Automated testing
- REST support
- Open-source
- Lightweight design
Why it stands out
Bruno CLI is an excellent choice for developers who value version control and simplicity. By treating API collections as source files, it fits naturally into modern Git-based development practices.
6. Newman
What it is
Newman is the command-line companion for Postman collections. It allows developers to execute Postman API tests directly from the terminal, making it possible to move API testing from a developer's desktop into automated workflows.
Instead of opening Postman manually and clicking through collections, teams can run the same tests using scripts or CI/CD pipelines.
When to use it
Newman is a good choice for teams that already use Postman for designing and organizing API requests but want to automate execution.
For example, a backend team may maintain a collection containing authentication tests, user management endpoints, and payment workflows. Before deploying a new version of their application, Newman can automatically execute the collection and verify that critical APIs still behave correctly.
It is also useful in DevOps workflows. A team can configure Newman to run after every Git push, ensuring that API changes do not introduce unexpected failures.
Key Features
- Run Postman collections from the terminal
- Automated API testing
- Environment support
- CI/CD integration
- Test scripts
- Custom reporters
- JSON and HTML reports
- Pipeline automation
Why it stands out
Newman's biggest advantage is its connection with the Postman ecosystem. Teams do not need to rewrite their existing API tests or collections they can simply move execution into automated environments.
For organizations already invested in Postman, Newman provides one of the easiest paths from manual API testing to continuous API testing.
7. xh
What it is
xh is a modern command-line HTTP client inspired by HTTPie. It focuses on providing a fast, simple, and developer-friendly way to send HTTP requests directly from the terminal.
Built with Rust, xh aims to provide a lightweight alternative for developers who want a clean CLI experience without unnecessary complexity.
When to use it
xh is useful for developers who frequently test APIs during local development and want a faster alternative to traditional HTTP tools.
For example, a developer building a REST API might use xh to quickly test authentication flows, send JSON payloads, or inspect responses while working on backend code.
It is also a good fit for developers who prefer minimal tools that start instantly and work well inside scripts.
Key Features
- Simple HTTP requests
- JSON support
- HTTP headers
- Authentication
- File uploads
- Fast execution
- Clean terminal output
- Cross-platform support
Why it stands out
xh focuses heavily on developer experience. Its syntax is easier to remember than many traditional command-line HTTP utilities while maintaining the flexibility developers expect from a terminal tool.
For developers who like the simplicity of HTTPie but want a lightweight modern implementation, xh is worth exploring.
8. restish
What it is
restish is a command-line REST API client designed specifically for working with APIs in a more structured way. It provides features that go beyond simple HTTP requests, including API discovery, authentication handling, and reusable configurations.
When to use it
restish is useful for developers working with multiple APIs or complex API environments.
For example, a platform engineer managing internal company services may need to frequently interact with dozens of REST endpoints. Instead of repeatedly writing long commands with authentication headers and URLs, restish allows developers to configure reusable API profiles and interact with services more efficiently.
It is also helpful for developers working with APIs that follow OpenAPI specifications because it can use API descriptions to improve the workflow.
Key Features
- REST API requests
- OpenAPI support
- Authentication handling
- Profiles and configurations
- Environment variables
- Request history
- Structured output
- Terminal workflows
Why it stands out
restish sits between simple HTTP clients and full API platforms. It provides more structure than curl while remaining focused on terminal-based workflows.
For developers who spend a lot of time interacting with REST APIs from the command line, it provides a more organized experience.
9. grpcurl
What it is
grpcurl is a command-line tool designed for testing and interacting with gRPC services. Similar to how curl works with HTTP APIs, grpcurl allows developers to communicate with gRPC servers directly from the terminal.
When to use it
grpcurl becomes especially valuable when working with microservices architectures.
For example, imagine a company where internal services communicate using gRPC instead of REST. A developer debugging an authentication service or payment service can use grpcurl to inspect available methods, send requests, and verify responses without needing to build a custom client.
It is also useful during development when frontend tools or traditional API clients do not support gRPC workflows.
Key Features
- gRPC request execution
- Service discovery
- Protocol buffer support
- TLS support
- Authentication
- JSON input/output
- Server reflection
- Debugging workflows
Why it stands out
While many API testing tools focus primarily on REST, grpcurl fills an important gap for teams building modern distributed systems.
As more companies adopt gRPC for internal communication, having a reliable terminal-based testing tool becomes increasingly important.
10. jq
What it is
jq is technically not an API testing tool by itself, but it has become an essential companion for developers working with APIs from the terminal.
It is a command-line JSON processor that allows developers to filter, transform, and analyze JSON responses.
When to use it
When testing APIs through tools like curl, HTTPie, or other CLI clients, responses can become difficult to read, especially when dealing with large JSON payloads.
For example, an API may return thousands of user records, but you only need to verify whether a specific field exists or extract a particular value. jq allows developers to process the response instantly without manually searching through raw JSON.
A common workflow looks like:
- Send an API request
- Pipe the response into jq
- Extract or validate the required data
Key Features
- JSON filtering
- Data transformation
- Field extraction
- Formatting
- Command-line pipelines
- Script integration
- Lightweight installation
Why it stands out
jq demonstrates an important part of terminal-based API testing: developers often combine multiple small tools to create powerful workflows.
While it does not send API requests itself, it makes other API testing tools significantly more useful.
Quick Comparison of Terminal-Based API Testing Tools
How to Choose the Right Terminal-Based API Testing Tool
The best tool depends on your workflow.
If you need a complete API workflow
Choose Apidog CLI.
It is designed for teams that need more than sending requests. API design, testing, documentation, environments, validation, and automation can all be connected through one workflow.
If you need quick API requests
Choose curl, HTTPie, or xh.
These tools are excellent for debugging endpoints, checking responses, and experimenting during development.
If you need automated regression testing
Choose hurl, Newman, or Apidog CLI.
These tools are better suited for repeatable tests that run automatically in CI/CD pipelines.
If your team follows Git-first development
Choose Bruno CLI.
Keeping API collections as files makes them easier to review, version, and maintain alongside application code.
If you work with gRPC
Choose grpcurl.
It provides the terminal experience needed for debugging and testing gRPC-based services.
Final Thoughts
Terminal-based API testing has moved far beyond simple commands for sending HTTP requests.
Modern development teams increasingly need tools that fit into automated workflows, CI/CD pipelines, cloud environments, and AI-assisted development processes. The terminal provides a natural place for these workflows because commands can be scripted, shared, and repeated consistently.
There is no single tool that works for every developer.
A backend engineer debugging an endpoint may prefer curl or HTTPie. A QA engineer building regression tests may choose hurl or Newman. A team managing complex API workflows may need something more complete like Apidog CLI.
The important thing is choosing a tool that matches how your team actually builds and maintains APIs.
As development continues moving toward automation, terminal-based API testing will likely become an even bigger part of modern engineering workflows. Learning these tools today can make your API development process faster, more reliable, and easier to scale.
Top comments (1)
I particularly appreciate how you highlighted the importance of automation support and protocol flexibility in a terminal-based API testing tool, such as supporting REST, GraphQL, gRPC, and WebSockets. The point about reducing friction in the developer experience also resonates, as tools like Apidog CLI aim to streamline API testing and management directly from the command line. Your criteria for a good terminal-based API testing tool seem comprehensive, but I'm curious to know if you considered any trade-offs between the ease of use and the depth of features when evaluating these tools, and how that might impact their adoption in different development environments.