Open Source JSON Projects
JSON is a lightweight text format for representing structured data as objects, arrays, strings, numbers, booleans, and null values. Its straightforward syntax makes it easy for people to read and for programs to generate and parse. JSON is widely used to exchange data between web services and applications, store configuration, and move information between systems. Its predictable structure helps developers work with data across different programming languages, though the basic format does not support comments or every native data type.
Open source JSON tools include parsers, validators, formatters, query and transformation utilities, viewers, and libraries for serialization or API development. When choosing one, consider compatibility with your language and data formats, schema support, performance, license, maintenance activity, and integration requirements. These tools are useful to developers building applications and services, as well as analysts and operators who inspect, transform, or validate structured data.
9 repositories · updated July 24, 2026
toapi: Declaratively Turn Any Website into a JSON API
toapi is a powerful Python library designed to transform any website into a clean JSON API declaratively. It enables users to define desired data fields using CSS selectors, fetching and parsing web pages on demand. With built-in caching and support for dynamic content, toapi simplifies web data extraction without complex crawlers or databases.
No-as-a-Service: A Fun API for Random Rejection Reasons
No-as-a-Service (NaaS) is a unique API that delivers random, creative, and often humorous rejection reasons. It's perfect for developers and users who need a witty excuse, a playful 'no,' or want to simulate being turned down in a lighthearted way. This simple service adds a touch of humor and practicality to any application or scenario.
Superjson: Safely Serialize JavaScript Expressions Beyond JSON
Superjson is a powerful JavaScript library designed to overcome the limitations of standard JSON serialization. It enables developers to safely serialize and deserialize a superset of JSON, including complex types like Dates, BigInts, Maps, and Sets. This makes it an ideal solution for robust data handling in modern web applications, especially with frameworks like Next.js.
SQLModel: Simplifying SQL Databases in Python with Pydantic and SQLAlchemy
SQLModel is a Python library designed for intuitive, compatible, and robust interaction with SQL databases. Built on Pydantic and SQLAlchemy, it streamlines database operations, especially within FastAPI applications, by leveraging Python type annotations. It aims to minimize code duplication and enhance developer experience with excellent editor support.
feedparser: A Robust Python Library for Parsing Feeds
feedparser is a widely-used and reliable Python library designed for parsing Atom and RSS feeds. It simplifies the process of extracting data from various feed formats, making it an essential tool for developers working with syndicated content. With extensive testing and clear documentation, feedparser offers a straightforward solution for feed consumption in Python applications.
Marker: High-Accuracy Document Conversion to Markdown and JSON
Marker is an open-source Python tool designed for high-accuracy conversion of documents like PDFs, images, and office files into Markdown, JSON, and HTML. It excels at preserving complex formatting, extracting images, and can leverage LLMs for even greater precision. This makes Marker a powerful solution for structured document intelligence.
Dasel: A Universal CLI Tool for Data Selection and Transformation
Dasel is a powerful command-line tool and Go library designed for querying, modifying, and transforming data across various formats like JSON, YAML, TOML, XML, and CSV. It provides a consistent syntax, making it an invaluable asset for developers, DevOps professionals, and anyone involved in data wrangling tasks. Its ability to convert between formats and integrate into scripts further enhances its utility.
JSON For You: The Ultimate JSON Visualization and Processing Tool
JSON For You is a powerful web-based tool designed for comprehensive JSON visualization and processing. It offers various view modes like Graph and Table, supports structured comparisons, and integrates `jq` for advanced querying. This open-source project provides an intuitive UI for developers working with JSON data.
Pipet: A Swiss-Army Tool for Web Scraping and Data Extraction
Pipet is a versatile command-line web scraper designed for hackers, enabling efficient data extraction from various online assets. It supports HTML parsing, JSON parsing, and client-side JavaScript evaluation, leveraging existing tools like `curl` and `playwright` for powerful and flexible scraping operations. This tool is ideal for tracking information, monitoring changes, and automating data collection tasks.