Open-source alternatives to Multer

Tide is an asynchronous web server framework and HTTP toolkit for the Rust programming language. It provides a system for building high-concurrency network applications and REST APIs using non-blocking I/O and asynchronous runtimes. The framework is centered around a middleware-based request pipeline, allowing developers to intercept and process HTTP requests and responses through pluggable logic layers. It supports a hierarchical route tree to organize endpoints into nested groups that share common path prefixes and scoped middleware. Capability areas include real-time communication via Web

Epicenter is a local-first knowledge management system and data orchestrator designed to structure information generated by large language models into validated schemas. It functions as a storage architecture that persists application data in human-readable files and databases to ensure user ownership and portability. The system distinguishes itself by projecting language model outputs into structured, schema-validated tables and utilizing conflict-free replicated data types to synchronize application state across multiple devices without a central server. This allows for offline access and c

MiaoYan is a local Markdown editor and personal knowledge management tool. It functions as a system for writing and organizing documents stored as local files, supporting the creation of a connected information network through bidirectional links and backlinks. The project includes a specialized tool for converting Markdown documents into slide-based presentations by using specific content separators. It also provides a command-line interface for managing files, allowing users to create, search, and open documents without a graphical file explorer. The editor features a side-by-side live pre

Iris is a high-performance web framework and API toolkit for the Go programming language. It provides the infrastructure necessary to build HTTP/2 web applications, REST APIs, and MVC-based websites. The project distinguishes itself through a flexible architectural model that supports multiple isolated application instances within a single process and allows for binary-embedded asset loading to eliminate external filesystem dependencies. It features dynamic router hot-reloading and a pluggable view engine for rendering dynamic HTML content. The framework covers a broad range of capabilities,

Uploadthing is a tool for integrating file uploads into web applications, providing a system to accept and store files through serverless file handling. It manages the end-to-end upload process, from creating backend endpoints to delivering content via a content delivery network. The project utilizes a presigned URL workflow to allow clients to upload files directly to cloud storage, reducing server ingress. It features a route-based validation system to enforce constraints on file types and sizes, alongside middleware for request authorization and secure post-upload callback webhooks. The p

This is a header-only C++ library that provides implementations for HTTP clients, HTTP servers, and a WebSocket framework. It allows for the creation of network services and the consumption of remote APIs without requiring a separate compilation step or external binary linking. The project features backend-agnostic TLS integration for secure HTTPS and WSS communication and employs a thread-pool model to process concurrent requests. It distinguishes itself with a full-duplex WebSocket state-machine and a middleware-based request pipeline that supports regular-expression path routing. The libr

Huma is an OpenAPI REST framework for Go designed for building HTTP services with automatic OpenAPI 3.1 specification generation and JSON Schema validation. It serves as a toolkit for developing REST and RPC APIs with typed inputs and outputs, deriving interactive documentation directly from the source code. The framework distinguishes itself by automating the synchronization between implementation and documentation. It uses a content-negotiation engine to manage multiple serialization formats via client headers and employs a JSON Schema input validator to automatically verify request paramet

N-blog is a full-stack JavaScript blogging platform and content management system built with Node.js. It functions as a server-side rendered web application that renders markdown source text into HTML for publishing and displaying articles. The system includes a markdown blogging engine that enables the creation and management of posts and user comments. It features a integrated user authentication system that handles account registration, secure sign-in, and session management to protect private routes. The project covers broad capability areas including request routing and middleware pipel

libhv is a high-performance C/C++ network library and event-driven I/O framework used to build TCP, UDP, SSL, HTTP, WebSocket, and MQTT clients and servers. It provides a non-blocking event loop for managing network sockets, timers, and system signals across multiple threads. The project is distinguished by its integrated support for specialized network roles, including a full HTTP web server with RESTful routing and middleware, an MQTT messaging client for IoT communication, and the ability to implement SOCKS5 and HTTP proxies. It also features a reliable UDP implementation to ensure ordered

Apollo Server is a spec-compliant JavaScript implementation for building GraphQL APIs that resolve queries and mutations based on a defined schema. It functions as a Node.js framework that integrates GraphQL functionality into various web frameworks and serverless environments through middleware. The project provides a federated GraphQL gateway that aggregates multiple distributed subgraphs into a single unified entry point. It includes a built-in interactive API sandbox for testing operations at the server endpoint and a schema registry client to automate the synchronization of API definitio

FastHTML is a full-stack Python web framework designed for building interactive web applications using pure Python. It functions as an HTMX integration framework and a Python HTML domain-specific language, allowing developers to generate HTML structures using native objects and functions instead of external templating files. The framework is distinguished by its native support for real-time bidirectional communication via WebSockets and Server-Sent Events, enabling server-side updates to be pushed to the browser without full page reloads. It further integrates identity management through OAut

GraphQL Yoga is a GraphQL server framework designed for building APIs that operate across all JavaScript environments. It utilizes the WHATWG Fetch API to provide a standardized request and response interface, enabling the server to run on serverless and edge computing platforms. The framework includes a specialized server for processing file uploads via the standard GraphQL multipart request specification and a subscription server that delivers real-time data streaming through server-sent events. An extensible plugin framework allows for the injection of custom behaviors and logic into the r

Connexion is a spec-first Python web framework designed to derive server behavior and validation logic directly from a predefined API contract. It enables the development of web services by using an OpenAPI specification to automatically handle routing, request validation, and response serialization. The framework distinguishes itself by acting as an OpenAPI request validator and mock server. It can simulate API behavior by serving example responses based on specification schemas, allowing for frontend development and prototyping before a backend implementation is completed. Additionally, it

This project is a Node.js web application boilerplate designed to accelerate development by providing a pre-configured foundation with integrated routing, templating, and developer tooling. It serves as a comprehensive starter kit that includes a full-stack authentication system, a payment integration starter, and an LLM agent framework. The framework distinguishes itself with specialized tools for AI development, including a retrieval-augmented generation implementation kit with vector search and semantic caching. It enables the creation of reasoning agents featuring tool-calling loops and r

SQLite is a serverless relational database engine and C-based library that stores data in a single local disk file. It functions as an embedded SQL database, integrating directly into applications without the need for a separate server process. The engine includes specialized capabilities for full-text search indexing and spatial data querying using R-Tree structures for geographic or geometric coordinate ranges. The system provides broad support for SQL data manipulation, database recovery and repair, and change tracking for synchronizing modifications between databases. It also features a

ng-file-upload is an Angular directive for handling multipart file uploads and drag-and-drop selection within Angular applications. It functions as a client-side tool for validating file attributes, processing images, and generating media previews before transmission to a server. The project includes a client-side image processor for resizing, center-cropping, and correcting JPEG EXIF orientation. It also features a browser-based media previewer for images, audio, and video files, and an HTML5 File API shim to provide upload and reader functionality for legacy browsers. Additional capabiliti

Notable is a local-first markdown note-taking application designed for managing personal knowledge bases. It functions as a document management system that stores all notes and attachments as plain text files directly on the local disk, ensuring data ownership and compatibility with external file-system tools. The application prioritizes a keyboard-centric workflow, utilizing a command-palette-driven interface to facilitate rapid navigation and content manipulation. It provides a distraction-free writing environment that allows users to hide interface elements, helping to maintain focus while

The Cloudflare Workers Rust SDK is a toolchain and framework for building high-performance serverless functions using Rust. It compiles code into WebAssembly modules that execute within a sandboxed host environment at the edge. The project provides a typed remote procedure call system for invoking functions across different worker instances and utilizes procedural macros for mapping these distributed interfaces. It uses trait-based bindings and standardized wrappers to provide type-safe access to platform services and web-standard request and response objects. The SDK covers a broad range of

Notable is a local-first markdown note taking application and document manager. It functions as a personal knowledge base that persists notes as plain text files on the local disk to ensure data portability and user ownership. The application provides a markdown editor featuring a split-pane live preview for real-time rendering of content, including mathematical expressions and diagrams. Information is organized through a hierarchical tagging system that allows for nested labels and multi-dimensional categorization. The software includes tools for bulk note management to apply operations acr

Lura is an API gateway and traffic router that directs network requests to backend services using a configurable pipeline of processing steps. It functions as a backend load balancer and a request middleware engine designed to validate, modify, and transform incoming requests and responses. The system specializes in API response aggregation, allowing it to execute concurrent requests to multiple backend services and merge the results into a single unified output. This includes the ability to perform dynamic response mapping by renaming fields and filtering data to optimize the final client pa

body-parser is a Node.js HTTP request parser that converts incoming request bodies into structured JavaScript objects. It provides utilities to extract and process JSON, raw binary, plain text, and URL-encoded payloads for use in web servers. The project employs a middleware pattern to augment request objects, attaching parsed data directly to the request for use in subsequent route handlers. It uses content-type based dispatching to select the appropriate parsing logic based on the request headers. The tool manages data streams by consuming payloads in chunks and accumulating binary buffers

Crow is a minimalist C++ micro web framework designed for building fast web servers and REST APIs. It provides a lightweight toolkit for web development in C++, offering core routing and request handling capabilities. The framework includes a built-in JSON parser for converting strings into structured data and an HTML template engine for generating dynamic web pages on the server. It also functions as a WebSocket server library to enable bidirectional, real-time communication between servers and web clients. Additional capabilities include a middleware-based request pipeline for executing sh

Koa is a lightweight web framework for Node.js designed for building HTTP applications and servers. It functions as an asynchronous middleware engine that processes network requests through a sequence of functions sharing a common context. The framework distinguishes itself by using an onion-model middleware stack and promise-based flow control. This architecture allows requests to flow downstream and responses to flow back upstream through the same chain, enabling non-blocking request cycles and a modular approach to handling network traffic. The system provides high-level capabilities for

Logan is a cross-platform mobile logging framework that collects, stores, and uploads client-side logs from iOS, Android, Web, and Flutter environments for centralized debugging and analysis. It provides a complete pipeline from client-side log buffering and file-based local storage through to server-side ingestion and a visual browser for inspecting parsed logs. The system uses a structured binary protocol to encode log entries with content, type, timestamp, and thread metadata, enabling consistent parsing across platforms. A log receiving server handles uploaded files, while a web-based int

Plug is a specification and set of primitives for building composable middleware pipelines in Elixir web applications. It provides a system for managing HTTP request pipelines and a routing engine that dispatches incoming requests to specific handlers based on methods and URL patterns. The project enables the creation of interchangeable web middleware for tasks such as authentication, logging, and session management. It also includes mechanisms for upgrading standard HTTP requests to full-duplex WebSocket connections. The capability surface covers request body parsing, static asset delivery,

go-restful is a framework for building RESTful web services in Go. It functions as a toolkit for managing API endpoints, providing a request router that maps incoming HTTP requests to handler functions using path parameters and custom URL patterns. The framework includes a data conversion layer that transforms Go structures into JSON or XML formats for request and response bodies. It also provides a system for organizing related web services into containers to manage endpoint prefixing and shared configuration. The project covers request lifecycle management through middleware filters for va

InsForge is a backend-as-a-service platform that provides an integrated suite of tools for managing relational databases, identity provision, object storage, and serverless compute. It functions as an open-source identity provider and a PostgreSQL database manager featuring integrated vector storage and row-level security. The platform serves as an LLM orchestration gateway, offering a unified endpoint to route requests across various AI providers through an OpenAI-compatible interface. It enables AI-driven application generation and connects AI agents to backend resources using a standardize