Processed locally
Parsing, formatting, Diff, JWT decoding, format conversion, and export all run as JavaScript in the current tab. No backend API processes your text.
About and privacy
JSONVue is a set of JSON tools that run in the browser, covering everyday formatting, validation, comparison, conversion, and code generation.
No data upload
We do not send the JSON, YAML, JWT, or Cookie you paste to a server. Close or refresh the page and the in-memory content is gone.
No accounts
No sign-up, and no cloud history. Clear the input yourself after working with sensitive data.
Privacy notes
Does my data leave this device?
The tools themselves do not upload what you edit. If the site has analytics (such as Matomo), it may record page visits, but not the JSON in the input box.
Is JWT decoding safe?
This tool only Base64URL-decodes the Header and Payload. It does not verify signatures in the browser. Production verification belongs on the server, and private keys should never be used in a web tool.
Which browsers are supported?
Use a modern browser such as Chrome, Firefox, Safari, or Edge. The clipboard Paste button requires a secure context (HTTPS or localhost).
Are there limits for large files?
Over about 2 MB it may slow down and show a warning; over 10 MB we recommend splitting the file or using a local CLI (such as jqOver about 2 MB it may slow down and show a warning; over 10 MB we recommend splitting the file or using a local CLI (such as