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6 task guides — 100% ブラウザ内で動作——データは端末から送信されません。
See What a JWT Token Contains (Header, Payload, Expiry)A JSON Web Token is readable by anyone who sees it — only its signature is protected. Paste one and Turn Minified JSON Into Readable, Indented OutputAPI responses and log lines often arrive as one long unbroken line. Pretty-printing with 2-space indCatch the Missing Comma Before It Breaks ProductionA single stray comma in package.json or a config file can fail a whole build pipeline. Validate firsDecode a Base64 Payload Back to Plain Text or BytesBase64 shows up in email attachments, data URIs, API tokens and debug dumps. Decoding it restores thConvert a Unix Timestamp to a Human Date (Both Directions)Logs store seconds since 1970; humans read dates. This converts epoch values to local time and back,Turn a CSV Export Into a JSON Array for an API PayloadSpreadsheets export CSV; most APIs speak JSON. The first row becomes the keys of every record — quot