Best Open Source C++ JSON Software for Windows

C++ JSON Software for Windows

JSON C++ Windows Clear Filters

Browse free open source C++ JSON Software for Windows and projects below. Use the toggles on the left to filter open source C++ JSON Software for Windows by OS, license, language, programming language, and project status.

Our Free Plans just got better! | Auth0
With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.

Try free now
Earn up to 16% annual interest with Nexo.
More flexibility. More control.

Generate interest, access liquidity without selling, and execute trades seamlessly. All in one platform. Geographic restrictions, eligibility, and terms apply.

Get started with Nexo.
1

gSOAP Toolkit

Development toolkit for Web Services and XML data bindings for C & C++

The gSOAP toolkit is an extensive suite of portable C and C++ software to develop XML Web services with powerful type-safe XML data bindings. Easy-to-use code-generator tools allow you to directly integrate XML data in C and C++. Serializes native application data in XML. Includes WSDL/XSD schema binding and auto-coding tools, stub/skeleton compiler, Web server integration with Apache module and IIS extension, high-performance XML processing with schema validation, fast MIME/MTOM streaming, SOAP and REST Web API development, WS-* protocols (WS-Security, WS-Policy, WS-ReliableMessaging, etc), XML-RPC and JSON. Licensed under GPLv2. Visit the developer center with guides, tutorials, and examples at www.genivia.com/dev.html The documentation of the toolkit, libraries, plugins and more is available at www.genivia.com/docs.html Commercial-use licenses and expert technical support services are available at competitive pricing levels, please visit www.genivia.com/products.html

38 Reviews

Downloads: 3,171 This Week

Last Update: 2026-06-17
See Project
2

JSONViewer for Notepad++

A JSON viewer plugin for Notepad++

This plugin is meant to display a JSON string in a Treeview. It also marks the error position in case of parsing errors, and that's it. The plugin can be used in Notepad++.

Downloads: 42 This Week

Last Update: 2026-05-30
See Project
3

JSON for Modern C++

JSON that's part of C++

This is JSON for C++, a JSON library unlike any other that's packed with plenty of great features. While there may be dozens of JSON libraries out there, JSON for C++ stands out with a focus on three things: an intuitive syntax, trivial integration and serious testing. Using the operator magic of modern C++, this library makes JSON feel like a first class data type. With trivial integration, the entire code is made up of a single header file json.hpp, no dependencies, no complex build system required. It's been heavily unit-tested covering 100% of the code, and follows the Core Infrastructure Initiative (CII) best practices to ensure the highest quality at all times. Among its many features are JSON pointers, JSON patches, Iterators, SAX parsing and various container operations.

Downloads: 31 This Week

Last Update: 2025-04-11
See Project
4

Universal-Updater

An easy to use app for installing and updating 3DS homebrew

Universal-Updater is a homebrew application for the Nintendo 3DS with the intention to make downloading other homebrew simple and easy. No need to manually copy files or go through installation processes, as it does that all for you.

Downloads: 12 This Week

Last Update: 2026-06-20
See Project
$300 Free Credits to Build on Google Cloud
New to Google Cloud? Get $300 in credits to explore Compute Engine, BigQuery, Cloud Run, Gemini Enterprise Agent Platform, and more.

Start your next project with $300 in free Google Cloud credit. Spin up VMs, run containers, query petabytes in BigQuery, or build agents with Gemini Enterprise Agent Platform. Once your credits are used, keep building with 20+ always-free tier products including Compute Engine, Cloud Storage, GKE, and Cloud Run functions. No commitment required—just sign up and start building.

Claim $300 Free
5

R3nzSkin

Skin changer for League of Legends (LOL)

R3nzSkin is an internal skin changer for League of Legends. Change the skin of your champion, your ward, other champions, towers, minions, and jungle monsters in the game. If your CPU supports the AVX / AVX2 / AVX-512 instruction set, you can enable it in project settings. This should result in more performant code, optimized for your CPU. Currently, SSE2 instructions are selected in project settings. Change skins anytime and unlimited times in a single game. Supports all popular languages in the world.

Downloads: 9 This Week

Last Update: 2024-04-03
See Project
6

ArduinoJson

JSON library for Arduino and embedded C++. Simple and efficient

ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things). ArduinoJson has a simple and intuitive syntax to handle objects and arrays. ArduinoJson supports both JSON serialization and deserialization. ArduinoJson uses a fixed memory allocation, allowing to work on devices with very little RAM. ArduinoJson can filter large inputs to keep only fields that are relevant to your application, thereby saving a lot of memory. ArduinoJson can parse directly from an input Stream or std::istream. ArduinoJson can produce compact or prettified documents. ArduinoJson works directly with strings stored in program memory. ArduinoJson supports two coding styles, with implicit or explicit casts. ArduinoJson deduplicates strings in the JSON document. When you have several identical keys or values, the JsonDocument only stores one of each. In practice, this feature reduces memory consumption by 20-30%.

Downloads: 6 This Week

Last Update: 2026-03-02
See Project
7

D++

C++ Discord API Bot Library - D++ is Lightweight and scalable

D++ is a lightweight and simple library for Discord written in modern C++. It is designed to cover as much of the API specification as possible and to have an incredibly small memory footprint, even when caching large amounts of data. It is created by the developer of TriviaBot and contributed to by a dedicated team of developers.

Downloads: 6 This Week

Last Update: 2026-05-20
See Project
8

StringZilla

10x faster string search, split, sort, and shuffle for long strings

StringZilla is the Godzilla of string libraries, splitting, sorting, and shuffling large textual datasets. StringZilla uses a heuristic so simple it's almost stupid... but it works. It matches the first few letters of words with hyper-scalar code to achieve memcpy speeds. The implementation fits into a single C 99 header file and uses different SIMD flavors and SWAR on older platforms. The Str is designed to replace long Python str strings and wrap our C-level API. On the other hand, the File memory-maps a file from persistent memory without loading its copy into RAM. The contents of that file would remain immutable, and the mapping can be shared by multiple Python processes simultaneously. A standard dataset pre-processing use case would be to map a sizeable textual dataset like Common Crawl into memory, spawn child processes, and split the job between them.

Downloads: 4 This Week

Last Update: 2026-06-05
See Project
9

Glaze

Extremely fast, in memory, JSON and interface library for modern C++

One of the fastest JSON libraries in the world. Glaze reads and writes from C++ memory, simplifying interfaces and offering incredible performance. Glaze also supports binary messages via BEVE and CSV support. And, the library has many more useful features for building APIs.

Downloads: 2 This Week

Last Update: 7 days ago
See Project
Ship Agents Faster
Transform your applications and workflows into powerful agentic systems at global scale.

Gemini Enterprise Agent Platform lets you rapidly build, scale, govern and optimize production-ready agents grounded in your organization's data. The platform enables developers to build custom or pre-built agents for virtually any use case. New customers get $300 in free credits.

Get Started Free
10

Rapid YAML

Library to parse and emit YAML, and do it fast

Or ryml, for short. ryml is a C++ library to parse and emit YAML, and do it fast, on everything from x64 to bare-metal chips without operating system. (If you are looking to use your programs with a YAML tree as a configuration tree with override facilities, take a look at c4conf). ryml parses both read-only and in-situ source buffers; the resulting data nodes hold only views to sub-ranges of the source buffer. No string copies or duplications are done, and no virtual functions are used. The data tree is a flat index-based structure stored in a single array. Serialization happens only at your direct request, after parsing / before emitting. Internally, the data tree representation stores only string views and has no knowledge of types, but of course, every node can have a YAML type tag. ryml makes it easy and fast to read and modify the data tree.

Downloads: 2 This Week

Last Update: 2026-06-08
See Project
11

iguana

Universal serialization engine

iguana is a modern, universal and easy-to-use serialization engine developed in C++20 and C++17. Serialize an object to any other format data with compile-time reflection, such as json, xml, binary, table and so on. This library is designed to unify and simplify serialization in a portable cross-platform manner. This library is also easy to extend, and you can serialize any format of data with the library.

Downloads: 2 This Week

Last Update: 2025-12-03
See Project
12

libjson-rpc-cpp

C++ framework for json-rpc (json remote procedure call)

This framework provides cross-platform JSON-RPC (remote procedure call) support for C++. It is fully JSON-RPC 2.0 & 1.0 compatible.

Downloads: 2 This Week

Last Update: 2023-10-19
See Project
13

Coost

A tiny boost library in C++11

coost is an elegant and efficient cross-platform C++ base library. Its goal is to create a sword of C++ to make C++ programming easy and enjoyable. Coost, co for short, is like boost, but more lightweight, the static library built on Linux or Mac is only about 1MB in size. log supports two types of logs: one is level log, which is divided into 5 levels: debug, info, warning, error, and fatal, printing a fatal log will terminate the program; the other is topic log, logs are grouped by topic and logs of different topics are written to different files.

Downloads: 1 This Week

Last Update: 2025-05-22
See Project
14

JsonCpp

A C++ library for interacting with JSON

JSON is a lightweight data-interchange format. It can represent numbers, strings, ordered sequences of values, and collections of name/value pairs. JsonCpp is a C++ library that allows manipulating JSON values, including serialization and deserialization to and from strings. It can also preserve existing comment in unserialization/serialization steps, making it a convenient format to store user input files. The branch 00.11.zis a new branch, its major version number 00 is to show that it is different from 0.y.z and 1.y.z, the main purpose of this branch is to make a balance between the other two branches. Thus, users can use some new features in this new branch that introduced in 1.y.z, but can hardly applied into 0.y.z. You can download and install JsonCpp using the vcpkg dependency manager. The JsonCpp port in vcpkg is kept up to date by Microsoft team members and community contributors.

Downloads: 1 This Week

Last Update: 2026-06-14
See Project
15

TreeFrog Framework

TreeFrog Framework, High-speed C++ MVC Framework for Web Applications

TreeFrog Framework is a high-speed and full-stack C++ framework for developing Web applications, which supports HTTP and WebSocket protocol. Web applications can run faster than that of scripting language because the server-side framework was written in C++/Qt. In application development, it provides an O/R mapping system and template systems on an MVC architecture, aims to achieve high productivity through the policy of convention over configuration. TreeFrog Framework is cross-platform. It runs on Windows, of course, but also on UNIX-like Operating Systems, macOS, and Linux. Using Windows open-source coding, it is possible to support Linux. Web applications that run on multiple platforms are also possible, simply by recompiling the source code. TreeFrog Framework is open-source software, under the new BSD license (3-clause BSD License).

Downloads: 1 This Week

Last Update: 2025-09-27
See Project
16

Vince's CSV Parser

A modern C++ library for reading, writing, and analyzing CSV

There's plenty of other CSV parsers in the wild, but I had a hard time finding what I wanted. Inspired by Python's csv module, I wanted a library with simple, intuitive syntax. Furthermore, I wanted support for special use cases such as calculating statistics on very large files. With the deluge of large datasets available, a performant CSV parser is a necessity. By using overlapped threads, memory-mapped IO, and efficient data structures, this parser can quickly tackle large CSV files. Furthermore, this parser has a minimal memory footprint and can handle larger-than-RAM files.

Downloads: 1 This Week

Last Update: 2026-05-26
See Project
17

simdjson

Parsing gigabytes of JSON per second

JSON is everywhere on the Internet. Servers spend a *lot* of time parsing it. We need a fresh approach. The simdjson library uses commonly available SIMD instructions and microparallel algorithms to parse JSON 4x faster than RapidJSON and 25x faster than JSON for Modern C++. The simdjson library uses three-quarters less instructions than state-of-the-art parser RapidJSON. To our knowledge, simdjson is the first fully-validating JSON parser to run at gigabytes per second (GB/s) on commodity processors. It can parse millions of JSON documents per second on a single core.

Downloads: 1 This Week

Last Update: 2026-05-06
See Project
18

toml++

Header-only TOML config file parser and serializer for C++17

Header-only TOML config file parser and serializer for C++17.

Downloads: 1 This Week

Last Update: 2023-10-13
See Project
19

open-dis

Open-DIS implements the IEEE DIS protocol in multiple languages.

An open source implementation of the Distributed Interactive Simulation (IEEE-1278) standard in C++, C-Sharp, Objective-C, Java, Javascript and XML. Example applications including sending and receiving native DIS traffic, X-Plane plugin, and WebSocket/Javascript/WebGL applications. See the individual code directories for each package of interest. This project is inactive and has migrated to a GitHub project at https://github.com/open-dis

Downloads: 9 This Week

Last Update: 2022-02-05
See Project
20

QJson

JSON is a lightweight data-interchange format. It can represents integer, real number, string, an ordered sequence of value, and a collection of name/value pairs. QJson is a qt-based library that maps JSON data to QVariant objects.

3 Reviews

Downloads: 2 This Week

Last Update: 2018-01-22
See Project
21

JSON Parser

JSON Parser written in C that outputs JSON into D-List list objects

JSON parser is a highly efficient JSON data decoder written in C, that parses JSON data into a form that is very easy to use from within C code. You only need to include the json-parser.h file in your source code. If your project does not already incorporate D-List, you will also need to include dlist.h The JSON parser package also includes a JSON validator that does not parse or create resources, but allows the caller to validate JSON data from unknown sources, prior to any parsing attempts. The JSON data is returned to the caller as a set of hierarchical D-List list objects, that make the data very easy to manage, sort, search or use, and easy to remove when done. Package includes a JSON textural generator which will create JSON grammar data blocks from hierarchical D-List representations of JSON data. The package also includes a variety of support functions to allow C code to easily find, add, and modify JSON values and members in D-List hierarchical structures.

Downloads: 6 This Week

Last Update: 2022-09-26
See Project
22

QBooru

Simple viewer app for most Booru Sites, coded in Qt C++

QBooru is a lightweight Windows and Linux client that allows users to see pictures from most booru sites, and download them, for example : - Gelbooru - Danbooru - Konachan - Yandere - Safebooru - Rule34 At the moment, it supports 4 APIs : - Gelbooru - Danbooru 2 - Moebooru - Derpibooru Searchs are done by the JSON APIs. Thumbnails are cached locally, and are re-used by the program if needed. Interface The current interface allows users to chose how many pictures they want, within 3-5 rows and 5-8 columns. The recommended size is 3*5, as it fits perfectly the smallest window size. Search tab example : http://puu.sh/cK0pj.jpg Users can change nearly all the parameters through the Option tab, or by editing the configuration.json file. Boorus can be added, edited, and deleted through the Booru tab in the software, but they can also be edited manually in the configuration file.

Downloads: 5 This Week

Last Update: 2016-10-28
See Project
23

ujson

A tiny C++ JSON reader with a very simple API

Downloads: 2 This Week

Last Update: 2026-05-08
See Project
24

M's JSON parser

A JSON parser written in ISO C

M's JSON parser is a small JSON parser written in ISO C which enables the user to handle information described by the JSON data interchange format.

3 Reviews

Downloads: 1 This Week

Last Update: 2017-09-20
See Project
25

CAJUN - C++ API for JSON

CAJUN is a C++ API for the JSON data interchange format with an emphasis on an intuitive, concise interface. The library provides JSON types and operations that mimic standard C++ as closely as possible in concept and design.

7 Reviews

Downloads: 0 This Week

Last Update: 2016-03-14
See Project