Developer tools

Everyday utilities for working with APIs and data. Because everything runs client-side, you can paste real payloads without sending them to a third-party server.

JSON formatterPretty-print, validate and minify JSON with clear error locations.
JWT decoderDecode a JSON Web Token to read its header, claims and expiry time.
Base64 encode / decodeEncode text to Base64 or decode it back, with full Unicode support.
Unix timestamp converterConvert Unix time to a readable date and back, in IST, UTC or local time.

Why client-side matters for developers

Pasting a production API response or a JWT into an online formatter usually means sending it to someone else’s server. NapTools developer tools run entirely in your browser, and nothing you paste is transmitted.

Tools

JSON formatter: validate API responses and config, with exact error positions.
JWT decoder: read claims and expiry without sending tokens anywhere.
Base64: UTF-8 safe encoding, including Base64URL.
Unix timestamp converter: epoch to IST/UTC and back, with automatic unit detection.