Open-source alternatives to Supertest

req is a chainable HTTP client library for Go designed to simplify request configuration and automatic response decoding into structures. It provides a fluent-interface request builder that allows developers to incrementally define request properties and encapsulate HTTP logic into reusable API SDKs. The project distinguishes itself with a TLS fingerprint emulator that mimics browser network signatures to bypass bot detection and crawler filters. It also includes a concurrent file downloader that increases transfer speeds by fetching large remote files in parallel segments. The library cover

Fuel is a Kotlin HTTP client library for Android and Kotlin applications that handles both synchronous and asynchronous web requests. It functions as a network wrapper that supports executing calls via suspending functions in coroutines, reactive streams, and traditional callbacks. The library features built-in integration for Android LiveData to bind network responses directly to observable state holders for user interface updates. It also includes a JSON serialization client that utilizes customizable mappers to convert raw HTTP response bodies into structured data objects. Capability area

Salvo is a comprehensive Rust web framework for building asynchronous HTTP servers and web applications. It features a hierarchical web router that uses a tree-based structure to map requests to handlers and an asynchronous middleware pipeline based on the onion model for request and response pre- and post-processing. The framework is distinguished by its native support for modern network protocols, including a QUIC-based HTTP/3 implementation alongside HTTP/1 and HTTP/2. It includes an integrated OpenAPI documentation generator that extracts schemas directly from handler signatures to produc

Supertest is a Node.js HTTP testing library that provides a framework for making requests and asserting responses from web servers. It functions as an HTTP assertion framework designed to verify status codes, response bodies, and headers during automated server tests. The library features an ephemeral port server manager that automatically binds servers to random available ports, removing the need for manual port tracking and preventing conflicts during concurrent test execution. It also includes an HTTP session state manager to persist cookies and session data across multiple sequential requ

Hono is a minimal JavaScript HTTP framework designed for building web servers across multiple runtimes, including Node.js, edge runtimes, and serverless platforms. It functions as a cross-runtime web server and a web standard API wrapper, normalizing various runtime request and response objects into standard Web API signatures. The project serves as an HTTP middleware orchestrator and request handler, utilizing a middleware-based request pipeline and hierarchical route mounting to create modular server structures. It distinguishes itself through a runtime-agnostic event wrapper that ensures c

Codeception is a full-stack testing framework for PHP applications that provides a unified interface for unit, functional, and acceptance testing. It serves as a tool for automating real desktop and mobile browsers via the WebDriver protocol and acts as a client for testing REST and SOAP APIs. The framework is distinguished by its support for Behavior-Driven Development, allowing users to write human-readable test specifications in Gherkin language to align technical tests with business requirements. It implements actor-based action mapping to connect these natural language steps to executabl

Inertia is a server-driven frontend framework designed to create monolithic single page applications. It acts as a state synchronization protocol and client-side routing bridge, allowing developers to build interactive experiences using modern JavaScript component libraries while keeping routing and controllers on the server. This approach eliminates the need for a separate REST or GraphQL API layer by passing data from server controllers to frontend components as props via JSON payloads. The framework distinguishes itself by utilizing adapter-based integration to link various backend environ

Got is a promise-based HTTP request library for Node.js that supports HTTP/2 and streaming. It provides a system for making network requests with a focus on asynchronous control flow and type-safe API client development. The library is distinguished by its middleware-based request lifecycle, which uses interceptors and plugins to modify request options and response data. It includes a configurable automatic retry mechanism with backoff strategies, a built-in HTTP response cache, and a cookie-jar system for maintaining persistent sessions. Broad capabilities cover data handling through duplex

Vapor is a comprehensive server-side web framework designed for building scalable, high-performance applications and APIs in Swift. It provides a non-blocking, event-loop-based runtime that manages concurrent task processing, background job queues, and asynchronous request handling. The framework is built around a dependency injection container that manages the lifecycle and resolution of services, configurations, and database connections throughout the request pipeline. The framework distinguishes itself through a protocol-oriented design that emphasizes type safety across all layers of the

Ion is an asynchronous HTTP client library for Android that handles network requests, JSON parsing, image loading, and file downloads. It provides a fluent builder pattern for constructing requests and supports automatic JSON deserialization into Java objects using Gson, along with in-memory image caching and multipart form-data encoding. The library distinguishes itself through its support for request cancellation via Future objects, allowing individual or bulk cancellation of in-flight requests to avoid wasted bandwidth and stale callbacks. It also includes proxy-aware request routing for d

cpr is a C++ networking library that provides a high-level HTTP request client. It functions as a wrapper around libcurl to simplify the process of sending and receiving data from web servers, specifically managing GET and POST calls and multipart form uploads. The library provides both synchronous and asynchronous execution models, allowing network requests to run on background threads to prevent application freezing. It integrates with the C++ Standard Library to map low-level pointers to standard strings and containers, utilizing RAII for automatic resource management. The project covers

Resty is a high-level HTTP client library for Go designed for consuming REST services. It provides a streamlined interface for executing network requests, managing server-sent event streams, and automatically mapping JSON and XML responses into data structures. The library includes built-in mechanisms for service resilience and traffic management, such as circuit breakers to prevent cascading failures, token-bucket rate limiting, and automated request retries with exponential backoff. It also features client-side load balancing to distribute outgoing traffic across multiple base URLs and requ

C++ is a high-level HTTP client library and wrapper for libcurl. It provides a C++ interface for making network requests, managing network sessions, and implementing data transfers. The library distinguishes itself by offering an asynchronous HTTP client capable of executing non-blocking requests via callback interfaces. It also functions as a multipart form uploader for transmitting files and structured data, as well as an SSE stream handler for processing real-time server-sent events over persistent connections. Its broader capabilities cover secure web communication through SSL encryption

node-fetch is a promise-based HTTP client library that provides a lightweight implementation of the Fetch API for the Node.js runtime. It serves as a network interface for performing asynchronous HTTP requests, handling server communication, and managing headers. The library utilizes a promise-based request lifecycle to wrap network calls, ensuring asynchronous behavior. It incorporates stream-based handling for both requests and responses to process large payloads efficiently without overloading system memory. Its capabilities cover a broad range of network communication tasks, including th

This library is a PHP HTTP client designed for executing synchronous and asynchronous network requests. It provides a standards-compliant implementation of the PSR-18 interface, enabling consistent interaction with remote web services and external systems. The library distinguishes itself through an abstraction-layered architecture that decouples the request interface from specific network drivers. It utilizes a middleware-driven pipeline to process requests and responses, while employing a strategy pattern to parse raw network streams into structured objects based on content type. The syste

HTTParty is a Ruby HTTP client library designed for building standardized API clients. It abstracts low-level network primitives into a high-level interface, allowing developers to encapsulate base URIs and request configurations within classes to maintain consistent interactions with remote web services. The library automates the transformation of raw network response data into native Ruby structures by using a registry-based system that parses content based on response headers. It also provides specialized mechanisms for sending multipart form data and streaming large payloads to maintain m

This is a Ruby HTTP client designed for REST API integration, resource modeling, and automated network communication. It provides a set of tools for managing headers, cookies, and SSL configurations, along with a dedicated command-line interface for executing one-off HTTP commands and managing interactive API testing sessions. The project differentiates itself through its resource modeling capabilities, which allow for the definition of persistent base URLs and credentials to construct nested subresource endpoints. It also features a multipart request handler that detects MIME types to upload

This library is a high-level networking tool for the Rust programming language, designed to execute HTTP requests and interact with remote services and REST APIs. It provides both asynchronous and blocking interfaces, allowing developers to send data using formats such as JSON or multipart forms while maintaining type-safe communication with external web services. The library distinguishes itself through a comprehensive architecture that manages network sessions and data flow. It utilizes connection pooling to maintain persistent sockets, which reduces latency during consecutive requests to t

Guzzle is a PHP HTTP client used for sending synchronous and asynchronous requests to web services. It serves as a concurrent HTTP request manager, an HTTP stream handler, and a middleware-based HTTP pipeline. The project is a PSR-7 compliant client, utilizing standardized PHP interfaces for requests, responses, and streams. The library differentiates itself through a customizable functional handler stack that allows for the interception and modification of the request and response lifecycle. It features an adapter-based transport system that enables swapping between network implementations,

Faraday is an HTTP client library for Ruby that sends requests and processes responses through a middleware pipeline with pluggable adapters. Its core identity is built around a middleware-pipeline architecture where HTTP requests and responses flow through a chain of components that can modify, log, or transform data before reaching the backend, combined with an adapter-based backend abstraction that delegates HTTP execution to interchangeable backends like Net::HTTP or Typhoeus. The library distinguishes itself through a parallel-execution engine that dispatches multiple HTTP requests concu

This project is a comprehensive Python network request framework designed for both synchronous and asynchronous HTTP communication. It provides a high-performance client capable of executing non-blocking requests within event-driven applications, while also supporting standard blocking calls for simpler scripts. The library is built to operate natively across diverse asynchronous runtimes, automatically detecting and utilizing the underlying event loop for concurrency. What distinguishes this library is its modular architecture, which decouples request construction from network execution thro

This is an HTTP client library used for sending and receiving network requests. It functions as an HTTP traffic replicator, a multipart form uploader, and an OAuth request signer, while also serving as an HTTP client capable of routing traffic through Unix domain sockets for local inter-process communication. The project distinguishes itself with the ability to import and parse HTTP Archive JSON files to reproduce recorded network traffic. It also provides cryptographic OAuth signing to secure API access using hashing algorithms and supports routing requests through Unix domain sockets using

node-fetch is a lightweight HTTP client library that implements the browser-standard Fetch API for Node.js. It provides a promise-based interface for making asynchronous network requests to retrieve or send data from server-side environments. The project specializes in memory-efficient data handling by utilizing request and response streaming. This allows for the incremental processing of large network payloads through native system streams to prevent memory exhaustion. The library covers a broad range of networking capabilities, including the use of custom HTTP agents for DNS and SSL config

http-prompt is an interactive HTTP client and API testing CLI designed for constructing and debugging network requests to REST and GraphQL endpoints. It functions as a command-line request builder and a shell extension built on top of HTTPie. The tool provides an interactive shell interface featuring request autocomplete and real-time syntax highlighting for requests and responses. It incorporates stateful session management to maintain request history and session data across multiple commands. The project covers API request automation and REST API debugging, allowing users to send and verif

Hurl is a command line HTTP testing tool and REST API test runner that uses a declarative, plain-text format to specify HTTP requests and responses. It functions as a client for continuous integration pipelines, allowing users to describe request sequences without a full programming language. The tool distinguishes itself by sequencing HTTP calls and verifying responses through matchers and variable capture. It maintains a stateful variable store, enabling data extracted from one response to influence subsequent requests within a workflow. The system covers API integration testing and REST w

FluentAssertions is a library of extension methods for .NET that provides a human-readable syntax for verifying expectations in unit tests. It serves as a validation layer that integrates with MSTest, NUnit, and xUnit to throw framework-specific exceptions upon assertion failure. The project includes a structural equivalency engine that performs deep member-by-member validation of .NET objects using configurable matching rules. It is designed for test-driven and behavior-driven development by generating descriptive failure messages that explain the difference between actual and expected resul