Text / JSON

Validate JSON

JSON.parse in this tab. Tells you if it is valid and the engine error if not.

Last checked: September 2026. Confirm millimetres, pixels, and KB on the official form. Not a government website.

InputOutput

Valid JSON.

Parses in this tab. Schema checking is not included.

Drop

Drop the file. It stays in this browser tab.

Set the cap or preset for this job.

Download from this device. Nothing is uploaded.

FAQ

Schema?Open

No JSON Schema here — only parse validity.

Is my file uploaded?Open

No. Work runs in this browser tab. Close it and the file is gone.

Related systems

01 / text

Pretty-print with 2-space indent. Invalid JSON shows the parser error.

02 / text

Parse with DOMParser and indent. Malformed XML is rejected.

03 / text

Indent HTML in this tab. The browser parser may normalise tags.