Best Free JSON Editors

IntelliJ IDEA is a JetBrains IDE for professional development in Java and Kotlin. It unlocks productive development and helps you write high-quality code with ease. Built to get the job done, it provides all of the essential tools and cutting-edge technology support you need. With a smooth, comfortable workflow and a strong focus on privacy and security, it lets you code with confidence and pleasure.

Apache NetBeans is a versatile, open-source Integrated Development Environment (IDE) used for developing applications across a wide range of programming languages, including Java, JavaScript, PHP, HTML5, and C/C++. Known for its modular architecture, NetBeans provides robust tools and features that cater to the needs of developers working on desktop, mobile, and web applications. It includes intelligent code editing, debugging, and profiling capabilities, along with a built-in visual GUI builder for designing Java-based user interfaces. NetBeans also offers support for version control systems like Git, SVN, and Mercurial, facilitating seamless team collaboration. As an Apache Software Foundation project, NetBeans benefits from an active community that continuously improves and expands its functionality, making it a reliable and flexible choice for developers across various domains.

Atom is a hackable text editor for the 21st century, built on Electron, and based on everything we love about our favorite editors. We designed it to be deeply customizable, but still approachable using the default configuration. A text editor is at the core of a developer’s toolbox, but it doesn't usually work alone. Work with Git and GitHub directly from Atom with the GitHub package. Create new branches, stage and commit, push and pull, resolve merge conflicts, view pull requests and more—all from within your editor. The GitHub package is already bundled with Atom, so you're ready to go! Atom works across operating systems. Use it on OS X, Windows, or Linux. Search for and install new packages or create your own right from Atom. Atom helps you write code faster with a smart and flexible autocomplete. Easily browse and open a single file, a whole project, or multiple projects in one window.

Zed is a next-generation code editor designed for high-performance collaboration with humans and AI. Written from scratch in Rust to efficiently leverage multiple CPU cores and your GPU. Integrate upcoming LLMs into your workflow to generate, transform, and analyze code. Chat with teammates, write notes together, and share your screen and project. Multibuffers compose excerpts from across the codebase in one editable surface. Evaluate code inline via Jupyter runtimes and collaboratively edit notebooks. Support for many languages via Tree-sitter, WebAssembly, and the Language Server Protocol. Fast native terminal tightly integrates with Zed's language-aware task runner and AI capabilities. First-class modal editing via Vim bindings, including features like text objects and marks. Zed is built by a global community of thousands of developers. Boost your Zed experience by choosing from hundreds of extensions that broaden language support, offer different themes, and more.

Create, edit & deploy fullstack apps — in just one click. Create user interfaces that are out of this world thanks to our partnership with Progress KendoReact. Go to Definitions, and other Visual Studio Code features just work. Tweak your app in real time without page reloads while preserving your app state. Import any NPM package into your project quicker than on local. Thanks to our revolutionary in-browser dev server. Drag & Drop files and folders into the editor. No more copy + pasting, uploading, or git commands. Your app is being hosted for easy live sharing. Create new projects by simply POSTing the desired project data from a form— useful when you don't/can't use our Javascript SDK. With your desired StackBlitz project open, simply drag and drop any files and folder you want to import.

Liquid Studio provides an advanced toolkit for XML and JSON development along with Web Service Testing and Data Mapping and Data Transformation tools. The Development Environment contains a complete set of tools for designing XML and JSON data structures and schemas. These tools provide editing, validating and advanced transformation capabilities. For novice or expert, the intuitive interface and comprehensive features will help you save time and money delivering a successful project. Visualize and edit an abstracted view of your XML schema(XSD) using an intuitive user interface, and validate your XSD against the W3C standards.Includes split graphical and text views, intellisense, syntax highlighting, drag and drop, copy and paste, and multi-step undo/redo. Visualize and edit an abstracted view of your JSON schema using an intuitive user interface, and validate your JSON Schema against the IETF standards.

​JSON Editor Online is a versatile tool designed for viewing, editing, formatting, repairing, comparing, querying, transforming, validating, and sharing JSON data. It offers multiple editing modes, text, tree, and table, to accommodate various user preferences. It supports large JSON files up to 512 MB and provides functionalities such as JSON Schema validation, JSON-to-CSV conversion, and offline usage. Users can load and save JSON data through various methods, including clipboard operations, drag-and-drop, disk storage, and URLs. The tool also features a "Smart JSON Formatting" option for more compact and readable JSON presentations. While the free version includes ads, subscription options are available for an ad-free experience and additional features like private cloud document storage. ​

​Json Genie (Viewer & Editor) is an application developed by Tuyware, designed to provide a comprehensive solution for managing JSON files on mobile devices. By leveraging the default file-opening methods, it enables users to access JSON files from various sources available on their devices. It offers functionalities such as cloning arrays, objects, and values; adding new elements; editing existing ones; and creating files from scratch. Additionally, Json Genie supports opening multiple files simultaneously, facilitating efficient data comparison and editing.

​The Online JSON Editor is a tool designed to facilitate the viewing, editing, formatting, validating, and beautifying of JSON data. It offers a user-friendly interface that allows for quick modifications of complex JSON code and supports multiple methods for code input, including direct typing, copy-pasting, file uploads, and URL retrieval. Online JSON Editor provides various code views such as tree, form, code, and text, enabling users to interact with JSON data in their preferred format. Additional features include real-time formatting, minification without altering code integrity, undo and redo functionalities, error highlighting with descriptive messages, and compatibility across multiple devices.

JSONBuddy is a comprehensive JSON editor and validator designed to streamline the creation and management of JSON and JSON Schema files. It offers a range of features, including a text editor with syntax coloring, auto-completion, and code folding, as well as a grid-style editor that simplifies the process of building JSON structures. It ensures error-free JSON through built-in syntax checking and validation against JSON Schema standards, supporting Drafts 4, 6, 7, 2019-09, and 2020-12. Additionally, JSONBuddy provides functionalities for converting between JSON, XML, and CSV formats, importing CSV data to generate JSON, and generating HTML documentation from JSON Schemas. For large JSON files, it offers robust support, allowing users to open, navigate, and edit files with thousands or even millions of lines efficiently.

JSONedit is a lightweight, portable JSON editor that offers text, tree, and list views for efficient data visualization and manipulation. It is a standalone executable of approximately 2 MB, requiring no installation and storing settings in a .ini file within its directory. Key features include syntax highlighting, tree reuse for maintaining node expansion states between sessions, drag-and-drop functionality for node movement, and tools for array manipulation such as cloning and CSV import. Users can reformat JSON data between compact and indented styles, search within text and tree views, and validate JSON syntax. JSONedit is freeware, allowing free use and distribution.

Smart JSON Editor is a powerful application tailored for app and web developers to create, edit, and manage JSON data structures efficiently. It offers a comprehensive suite of features, including a JSON tree tool for intuitive data visualization, value transformers for generating and modifying JSON values, and an embedded HTTP server for testing within applications. Users can import and export JSON files via various methods such as file uploads, pasteboard, and iCloud integration. The application supports the creation of smart objects (classes) that maintain key structures, facilitating the organization of associative arrays. Additionally, Smart JSON Editor provides advanced functionalities like JSON Path navigation, API request management with group and endpoint hierarchies, and token transformers for dynamic value composition in API headers and parameters. It also features search and filter capabilities, an iCloud library for asset storage, local server connections, etc.

​JSON Crack is an open source tool that transforms complex data formats, including JSON, YAML, CSV, XML, and TOML, into interactive, visually intuitive graphs, enhancing data comprehension and analysis. Users can input data directly, upload files, or provide URLs, and it automatically generates a visual tree graph. It supports data conversion between formats, such as JSON to CSV or XML to JSON, and includes features like JSON formatting, validation, and code generation for TypeScript interfaces, Golang structs, and JSON Schemas. Advanced tools are available for decoding JWTs, executing JQ queries, and performing JSON Path commands. Users can export visualizations as PNG, JPEG, or SVG files. All data processing occurs locally on the user's device, ensuring data privacy. ​

MongoLime allows you to easily manage and precisely control your MongoDB connections. Viewing and managing documents. Statistics, Indexes and other operations. Create and modify documents with a convenient MongoLime editor. Use raw JSON editor for complex documents. Search for documents using query builder. Save searches for a quick access. Export Databases and Collections in a JSON format as a ZIP archive. MongoLime is an application created to work with MongoDB databases on mobile devices and tablets running Android. The application’s interfaces are designed for easy data collection management. The application allows you to connect to MongoDB databases directly or in the Replica Set mode.

Eclipse Theia is an extensible platform to develop multi-language Cloud & Desktop IDEs with state-of-the-art web technologies. Not sure whether you need a web or desktop version or both? With Theia you can develop one IDE and run it in browsers or native desktop application from a single source. The Theia project is hosted at the Eclipse Foundation, a not-for-profit corporation, and is developed by a diverse community. Unlike other "open-source" projects, projects hosted at an Open-Source Foundation are protected against single-vendor decisions against the interest of the diverse community. Theia is designed in a modular way to allow extenders and adopters customizing and extending every aspect of it. Composing a custom IDE-like product is as easy as listing all needed extensions in a package.json file. Adding new functionality by implementing your own extensions is easy, too and provides all the flexibility you need.

CKEditor 5 is a modern WYSIWYG rich text editor that can easily accommodate the requirements of businesses and users in the age of digital transformation. It allows software creators and developers to build powerful writing solutions for applications of all sorts, within hours. Thanks to a fully customizable framework, ready-to-use builds, native integrations, extensive documentation, and reliable customer support, the editor can be fully tailored to your needs. To provide users with an all-around streamlined and collaborative writing experience, you can additionally include advanced features such as Track Changes and Comments, Revision History, and (if preferred) Real-time Collaboration! Easy Export to PDF and Word, responsive images, pagination, Markdown input and output support, and robust paste from Word and Google Docs are also popular choices.

Built from scratch, based on 20 years of experience developing IDEs. JetBrains Fleet uses the IntelliJ code-processing engine, with a distributed IDE architecture and a reimagined UI. We built Fleet to be a fast and lightweight text editor for when you need to quickly browse and edit your code. It starts up in an instant so you can begin working immediately, and it can easily transform into an IDE, with the IntelliJ code-processing engine running separately from the editor itself. Fleet inherits the things that developers love the most from IntelliJ-based IDEs – project and context aware code completion, navigation to definitions and usages, on-the-fly code quality checks, and quick-fixes. Fleet’s architecture is designed to support a range of configurations and workflows. You can simply run Fleet just on your machine, or move some of the processes elsewhere – for example by locating the code processing in the cloud.

Helix Editor is a powerful, modern text editor designed for developers seeking a fast, customizable, and efficient editing experience. Built with a focus on productivity, Helix uses a modal editing style inspired by Vim, which allows users to navigate, select, and manipulate text seamlessly through intuitive keyboard shortcuts. It offers a robust set of features including syntax highlighting, multi-caret editing, and support for languages like Rust, Python, and JavaScript. Helix also integrates with the Tree-sitter parsing library for precise syntax-aware editing, making it easier to work with complex code structures. With a minimal interface and a strong focus on performance, Helix Editor provides an ideal environment for programmers who prioritize speed and flexibility in their development workflow.

CodeBeautify is developed for beautify, minify, convert your code/data for your expected result. Visibility determines how the program is visible on codebeautify.org and who can access it. Everyone has access to the code Which is by clicking Save Online Button, and it is listed at the recent page. Everyone user has access to it's own code via link and it is not listed at the user recent page.

RunCode offers online developer workspaces, which are environments that allow you to work on code projects in a web browser. These workspaces provide you with a full development environment, including a code editor, a terminal, and access to a range of tools and libraries. They are designed to be easy to use and allow you to get started quickly without the need to set up a local development environment on your own computer.