Open-source alternatives to Jsonnet

This is an educational tutorial that walks through implementing a complete JSON library from scratch in C. The project covers the full data lifecycle of JSON, including parsing text into structured in-memory representations, validating input against the specification, serializing data back into standard JSON output, and providing structured access to elements within parsed arrays and objects. The implementation is built around a hand-written recursive descent parser that processes JSON text by matching grammar rules to build a structured data tree. Parsed values are stored in a tagged union r

This library provides a parser and encoder for YAML 1.2 data structures, enabling the transformation of human-readable YAML strings into native JavaScript objects and arrays. It is designed to function as a cross-platform utility, ensuring consistent data processing across both server-side runtimes and client-side browser environments. Beyond its core library functionality, the project includes a command-line interface for automating data conversion tasks. This utility supports bidirectional transformation between YAML and JSON formats, allowing for the programmatic manipulation and exchange

js-yaml is a JavaScript library providing a programmatic interface for parsing and dumping YAML data. It functions as a parser and serializer that converts YAML strings into JavaScript objects and transforms JavaScript objects back into YAML format. The library includes a command-line interface for parsing or dumping YAML data via direct input or data pipes. It also features an abstract syntax tree transformer to modify the structure of data during serialization. The project provides capabilities for multi-document processing and the definition of custom schemas and tags to handle specialize

YamlDotNet is a YAML serialization library and data mapping tool for .NET. It functions as a parser and generator that converts between .NET objects and YAML formatted text for data storage and configuration. The project provides capabilities for YAML document parsing and data object mapping. It transforms YAML streams into low-level representations or high-level object models for programmatic analysis and converts structured data objects back into valid YAML strings. The library covers general data serialization and configuration file management, allowing application data structures to be m

This project is a PHP library that serves as a configuration file processor, providing a bridge to translate human-readable YAML text into native PHP arrays and objects. It functions as both a parser for converting YAML content into application-ready data structures and a serializer for transforming PHP data back into formatted YAML strings. The library includes security protections designed to prevent memory exhaustion and stack overflow attacks when processing untrusted documents. It ensures structural integrity through syntax validation and provides a command-line utility to check files fo

Tilt is a Kubernetes development orchestrator and containerized workflow manager that automates the build, deploy, and update loop for cloud-native services. It functions as an infrastructure-as-code environment, defining the entire local development setup as versioned code to synchronize local source changes with cluster deployments. The project distinguishes itself by offering live container updates, which sync files directly into running containers to bypass full image rebuilds and redeployments. It includes a cloud-native development dashboard for monitoring resource health, streaming agg

Tera is a server-side rendering engine and template engine for Rust. It is designed to generate dynamic text by injecting data into predefined template files, utilizing a syntax compatible with Jinja2 and Django. The engine supports a variety of text generation tasks, including the creation of web pages via HTML rendering, the automation of email templates, and the production of environment-specific configuration files.

Pulumi is an infrastructure-as-code framework that enables the definition, deployment, and management of cloud resources using general-purpose programming languages. It functions as a cloud resource orchestrator that coordinates the lifecycle of heterogeneous infrastructure by executing code to construct dependency graphs and reconciling the desired state against actual cloud environments. The platform distinguishes itself through a language-host runtime bridge that allows developers to use standard programming languages to define infrastructure, rather than relying solely on domain-specific

gojq is a JSON query engine and transformation tool implemented in Go. It serves as a Go language port of the jq command, providing a library for embedding JSON and YAML manipulation capabilities directly into Go applications. The tool functions as an arbitrary-precision JSON processor, performing mathematical operations on large integers to prevent precision loss or numeric overflow during data transformations. Its broader capabilities include filtering and reshaping structured data using a specialized query language, converting between YAML and JSON formats, and formatting date and time st

chezmoi is a command-line utility designed to manage and synchronize system configuration files across multiple machines. It uses a local Git repository as the single source of truth, allowing users to track, version, and distribute dotfiles while maintaining a consistent state across diverse operating systems and hardware architectures. The project distinguishes itself through a declarative reconciliation model that computes the difference between the current filesystem and the desired state defined in the repository. It features a robust templating engine that processes configuration files

Duktape is an embeddable JavaScript engine and portable scripting runtime designed for integration into C and C++ applications. It functions as a lightweight ECMAScript runtime that provides a C-JavaScript bridge for exchanging data and invoking functions between native code and a script execution environment. The engine includes an ECMAScript bytecode compiler that allows for the serialization and caching of compiled functions to disk to reduce application startup time. It organizes script dependencies using a CommonJS-compliant module loader. The runtime covers a variety of capabilities in

Bases is a collection of pre-defined TypeScript configuration files designed to be extended by other projects. It serves as a TypeScript configuration base and build standard, providing shared files that unify language feature support and module resolution across multiple development targets. The project provides runtime-specific compiler presets that tune compiler targets and library options for specific execution environments. These presets ensure consistent build behavior and runtime compatibility by aligning the compiler with the requirements of the target engine. The system manages Type

Wren is an embeddable, class-based scripting language and bytecode interpreter. It provides a dependency-free virtual machine designed for integrating dynamic script execution into host applications via a C API. The language is centered on a modern object-oriented model featuring inheritance, method overloading, and first-class functions. It utilizes a concurrent fiber runtime to manage lightweight, cooperatively scheduled execution paths without relying on operating system threads. The project includes a comprehensive suite of object-oriented primitives, closure-based state capture, and a m

QuickJS is a lightweight, embeddable ECMAScript runtime that executes JavaScript programs conforming to the latest specification. It is designed as a compact, standards-compliant JavaScript engine suitable for resource-constrained environments and embedded systems, available both as prebuilt binaries and as source code that can be compiled for custom integration. The engine distinguishes itself through a minimal runtime footprint achieved by a single-pass compiler that produces compact bytecode, executed on a stack-based virtual machine. Memory management uses reference-counting garbage colle

mruby is a lightweight Ruby interpreter designed to be embedded into C applications. It compiles Ruby source code into a compact, platform-independent bytecode that executes on a register-based virtual machine, and exposes a stable C API for host programs to initialize the interpreter, load bytecode, and invoke Ruby methods at runtime. The interpreter distinguishes itself through a tightly coupled parser and compiler that performs lexical analysis, syntax parsing, and bytecode generation in a single pass without constructing an intermediate AST, minimizing memory overhead. It also includes a

LDTK is a visual 2D level editor used for designing game worlds, layouts, and entities. It focuses on transforming visual map designs into structured JSON files for integration into game engines, while providing utilities to export level data into the Tiled TMX format for external compatibility. The tool integrates directly with Aseprite, allowing source artwork to be linked to the editor so that visuals update in real time as external image files are saved. It also features automated tile rendering that applies visual skinning rules based on predefined configurations to manage map aesthetics

Lua is an embeddable scripting language written in ISO C, designed to be integrated into host applications for runtime customization. It provides a C-based scripting engine and a prototype-based object model that utilizes associative arrays and metatables to implement inheritance and complex data structures. The language features a cooperative multitasking system that manages concurrent execution threads via coroutines and an incremental garbage collector for automatic memory management. It includes a safe code sandbox to isolate global state and run untrusted scripts within a protected envir

This project is a parallel simulation engine and molecular dynamics simulator designed to model the physical movements of atoms and molecules. It functions as an interatomic potential framework for calculating forces between particles and a materials analysis tool for computing thermodynamic, structural, and transport properties of solids and fluids. The engine is distinguished by its high-performance computing capabilities, utilizing spatial-domain decomposition and message-passing interface communication to distribute workloads across processors. It supports multi-backend GPU acceleration v

This project is a curated reference guide and cheatsheet for modern JavaScript development. It provides a collection of syntax and patterns covering ECMAScript standards, specifically focusing on contemporary language features from ES6 and later. The resource offers specialized guides on asynchronous JavaScript, functional programming patterns, and object-oriented design. It details the use of promises and async/await syntax for non-blocking operations, as well as the application of map, filter, and reduce for data transformation. The guide covers a broad range of language fundamentals, incl

JSONModel is a data modeling framework and serialization library for Apple platforms, including iOS, macOS, watchOS, and tvOS. It transforms JSON strings and dictionaries into typed Swift objects to eliminate manual dictionary parsing. The framework provides a mapping system that utilizes custom key rules and dot-notation to resolve nested data hierarchies. It supports the conversion of complex JSON structures into organized model relationships and manages the transformation of JSON arrays into collections of typed model instances. The toolset includes data type transformation via custom tra

ChakraCore is an embedded JavaScript engine designed to be integrated as a library within a host application. Its primary purpose is to provide a programmable scripting layer and a lightweight runtime environment for executing JavaScript code and managing state via a programmatic interface. The project focuses on bridging high-level scripting with low-level system calls through a C API. This allows developers to implement custom scripting engines and embed JavaScript execution directly into applications to enable task automation and functional extensions. The engine utilizes a bytecode-based

Lazy.js is a JavaScript library that implements a lazy evaluation model for processing collections and data streams. It defers all computation until iteration begins, building chains of transformations that execute only when values are consumed, avoiding intermediate arrays and buffering. The library wraps data sources into a uniform sequence interface, enabling operations like map and filter to be chained together without materializing intermediate results. The library extends lazy processing beyond simple collections to handle asynchronous data sources, DOM events, strings, and Node.js stre

Serde-yaml is a serialization library for the Rust programming language that facilitates the conversion of complex data structures into YAML format and the deserialization of YAML text into strongly typed objects. It functions as a data format converter, enabling the transformation of structured information between native language types and human-readable configuration files. The library integrates with the standard Rust serialization ecosystem to map arbitrary data types to and from the YAML format. By utilizing trait-based data mapping, it allows developers to manage application settings an

The AWS Cloud Development Kit is an infrastructure-as-code framework that enables developers to define and provision cloud resources using familiar programming languages. By utilizing construct-based synthesis, it translates high-level, object-oriented code into declarative templates, allowing for the automated management of complex cloud environments through a centralized, code-driven control plane. The framework distinguishes itself through its ability to model infrastructure as a dependency-aware resource graph, ensuring that components are provisioned and updated in the correct order. It

Prefect is a workflow orchestration platform designed to define, schedule, and monitor complex data pipelines as Python code. It functions as a container-native engine that wraps individual tasks in isolated environments, ensuring consistent dependencies and resource allocation across diverse infrastructure. By utilizing a state-machine-based orchestration model, the system tracks execution progress through discrete transitions and persistent event logs to maintain reliable and observable task processing. The platform distinguishes itself through a decoupled worker-API architecture, which sep

dprint is a multi-language code formatter that applies consistent styling across various programming languages using a pluggable architecture. It functions as a unified project style management tool, a command-line interface for continuous integration style enforcement, and a Language Server Protocol implementation for real-time formatting in editors. The project is distinguished by a WebAssembly-based plugin system that loads sandboxed formatting logic from URLs or file paths. It further extends its capabilities through a process-based tool integration that wraps external command-line interf