JWT Decoder

Decode and inspect JWT tokens instantly. View header, payload, claims, and expiry status. Edit tokens and generate new ones.

Features

• Decode header and payload with pretty-printed JSON
• Shows expiry, issued-at, and other standard claims at a glance
• Edit payload and re-encode to test different tokens
• Validates signature when secret is provided (optional)
• Copy decoded claims or share link to token

Why use this tool

Debug auth flows, verify token contents, or test how your app handles different claims. Essential when integrating OAuth, API keys, or session JWTs.

Try it

Try JWT Decoder at Spoold →

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Spoold is a free developer toolbox that detects what you paste and opens the right tool.

• No sign-up – Use every tool without an account.
• Runs in your browser – Your data stays on your device; we don’t store or log your input.
• Paste and go – Paste JSON, HTML, JWT, curl, Base64, or any text on the homepage and Spoold suggests the right tool.
• One place for many tools – JSON formatter, JWT decoder, Base64, UUID generator, regex tester, curl-to-code, and more.

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