Online JSON Editor
Edit JSON with live validation, line numbers, syntax highlighting and inline error markers.
Input
Output
Ready
Drop a file to load it
About this tool
An editor that validates as you type. Syntax highlighting, line numbers and an error marker in the gutter mean you find a mistake while making it rather than after pasting the result somewhere else.
When you would use it
- Hand-editing a configuration file
- Building a test fixture
- Tweaking a payload before sending it
Worked example
{ "name": "Ada", "age": }
Line 1, column 25 — a value was expected after ":"
Things worth knowing
- Validation is debounced while typing so it never fights the cursor.
- Your work is kept in the browser tab only — reloading clears it, and nothing is stored on a server.
Questions
Frequently asked
Is my work saved?
No. Nothing is persisted or uploaded. Download the file if you need to keep it.
Is my data uploaded anywhere?
No. Every tool on JSONWorks runs entirely in your browser using JavaScript. Your input is never sent to a server, never logged and never stored. The simplest proof is to disconnect from the internet — the tools keep working. The site does load Google Fonts and a Google Analytics page-view tag, so you will see those two requests in your network tab, but neither receives anything you type or paste.
Does it work offline?
Yes. JSONWorks is installable as a progressive web app and caches itself on first visit, so every tool keeps working without a connection.
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