Online JSON Editor

Coding

Free
No Download/Install required
No registration

The undisputed best free online JSON editor: row code, formatted code, right click copy/paste menu, expanded nodes or not, color coding …

View and edit JSON
Has a low level text editor and high level tree view and table view
Format (beautify) and compact JSON
Sort, query, filter, and transform JSON
Repair JSON
JSON schema validation and pluggable custom validation
Color highlighting, undo/redo, search and replace
Utilities like a color picker and timestamp tag
Handles large JSON documents up to 512 MB

Note: we indicated it as being free due to the 99% of the features available, but it is Freemium in fact (1 advertisement on the right vs no advert and ability to store your huge files in the cloud)

Tip: for those with privacy concerns, this tool is open source and can be found here to be installed on your server if needed: https://github.com/josdejong/svelte-jsoneditor

Disciplines: Web development, API development, Data engineering, Software engineering.

Free alternative to Altova XMLSpy, Visual Studio Code.

Online JSON Editor compared with Altova XMLSpy and Visual Studio Code
Online JSON Editor	Altova XMLSpy	Visual Studio Code
Formats and functions: The editor offers tree, text and table views. It formats, compacts, sorts, queries, filters, transforms and repairs JSON, and validates against JSON Schema or custom validators.	Formats and functions: XMLSpy edits JSON, JSON5, JSON Lines, JSONC and BSON, converts between JSON and XML, and queries with XPath, XQuery and XSLT. It includes a graphical JSON Schema editor and converts between XML Schema and JSON Schema.
Size limits: The site states support for documents up to 512 MB. Cloud documents are limited to 1 MB each.
Platform: It runs in the browser. The underlying svelte-jsoneditor library can be embedded in web applications.	Platform: Windows is the primary platform, and macOS is supported through Parallels.	Platform: Desktop builds exist for macOS, Windows and Linux, and vscode.dev offers a browser version.
Cost model: The editor is free with one advertisement. A paid subscription removes ads and adds cloud storage.	Cost model: A free 30-day trial is offered and the product is bought through the vendor shop. No price was confirmed here.	Cost model: VS Code is free.
Openness: The svelte-jsoneditor library is open source under the ISC licence and can be installed on your own server, which helps when documents must not leave the organisation.		Openness: VS Code is described by its site as a free, open source editor.

Topics covered: JSON, online editor, formatted code, tree view, table view, beautify, compact, sort, query, filter, transform, validation, color highlighting, search and replace, open source, large documents, Freemium, and cloud storage..

Privacy: we have no feedback of potential problem with this tool and author. But like many online services, you are here providing them with your own data. Depending of the criticity of your data, this is your responsibility to assess author's reputation and potential misusage, and to check and accept their terms and conditions, or not.