Private developer tool
JSON Editor Online
Work directly in one JSON document with live validation and local file controls. Format or minify in place, then copy or download the edited text.
A private browser JSON workspace
Unlike the two-pane JSON Formatter, this editor treats the textarea as the document itself. Formatting and minifying replace the current document so you can continue editing the result.
Validation runs after each change and reports a readable parse error when possible. Opening, editing, copying, and downloading all happen in the browser without a server-side document store.
Does this upload my files?
No. Everything on this page runs locally in your browser, so your files are never uploaded to a conversion server. Close the tab and nothing is left behind.
After any required processing engine has loaded, repeated conversions can keep working offline. You can verify the claim with the site's reproducible browser privacy audit.
FAQ
How is this different from the JSON Formatter?
The editor is a single working document with live validation, line and character counts, file opening, direct formatting or minification, copying, and downloading. The formatter keeps the original input and writes a separate output.
Does the editor upload or save my JSON?
No. The document stays in the browser tab. It is not uploaded, autosaved to an account, or stored after you close the page.
Can it show the location of a JSON error?
When the browser supplies a parse position, the editor converts it into a line and column and displays it below the document.
Can I download invalid JSON?
Yes. The editor lets you download the current text while validation continues to show the error, which is useful when repairing an incomplete document.