Quick answer: prefer a local browser workflow when the task does not genuinely require a server, and always verify important output.
Treat tokens and logs as sensitive
A JWT can contain account identifiers, roles, tenant information and expiry times. Logs and API responses may include email addresses, internal URLs or credentials. Do not paste them into an arbitrary formatter.
Use synthetic data whenever possible. When real data is necessary, prefer a tool that performs the transformation on the device.
Formatting is not validation of meaning
A JSON formatter can confirm syntax and make a payload readable. It cannot prove that the field values are correct, authorized or safe to execute.
A JWT decoder reads the header and payload. Decoding does not verify the signature, issuer, audience or revocation status. Authentication decisions belong in a trusted application backend.
Remove secrets before sharing a result
Redact access tokens, refresh tokens, API keys, cookies, email addresses and identifiers before copying formatted output into an issue or chat. Preserve the shape of the data with obvious placeholders.
If a production secret has been exposed, editing the message is not enough. Revoke or rotate the credential according to the provider's incident process.
Verify local operation
Use the browser Network panel while formatting or decoding. The operation should not send the pasted value to InYourTab.com or another domain.
Close or refresh the tab after the task. InYourTab.com does not create a cloud project for the working input.