FileGizmo — for developers
Free developer tools
Format JSON, inspect JWT contents, and test regular expressions without pasting sensitive payloads into a server-backed utility. Everything runs locally.
Focused utilities
Choose a developer tool
Choose a focused task and start immediately. Every listed tool follows the same private, browser-based workflow.
Private by architecture
Inspect data without leaking the data
Debug payloads often include access scopes, customer identifiers, unreleased fields, or tokens copied from a local environment. A quick formatter should not turn that material into a network request. FileGizmo runs its developer utilities in your browser so JSON, JWT contents, regular-expression samples, and matches stay on the device where you opened them. You can verify that behavior in the browser’s own Network panel.
Each utility is deliberately narrow: format and sort JSON, decode the readable parts of a JWT, or test a regular expression against sample text. Errors are translated into useful guidance instead of exposing engine-specific exception dumps. JWT decoding never verifies a signature, and the interface says so clearly; authorization decisions still belong on a trusted server. No account, history sync, or task quota sits between you and a quick inspection.
Straight answers
Frequently asked questions
Are these developer tools free?
Yes. They are free to use without signup, saved history, or daily task limits.
Does the JWT decoder verify signatures?
No. It only decodes the readable header and payload. Always verify the signature and claims in trusted server-side code.
Are JSON, JWTs, or regex samples uploaded?
No. These utilities run locally in your browser and do not send the entered content to FileGizmo servers.