JWT Decoder

Inspect JSON Web Tokens by decoding the header and payload. Useful for debugging auth flows - decoding only, no signature verification.

Introduction

JWT Decoder is a free, browser-based utility in our Crypto & Security Tools collection. Inspect JSON Web Tokens by decoding the header and payload. Useful for debugging auth flows - decoding only, no signature verification. Parse Base64URL JWT segments into readable JSON so you can inspect claims while debugging. Signatures are not verified - this is for inspection, not auth. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include decode header and payload.

Features

Decode header and payload
Show signature segment
Pretty-printed JSON
Local-only processing

How to use

1
Paste a JWT into the input.
2
Inspect the decoded header and payload.
3
Copy either JSON block as needed.

Example

Payload claim

Input

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..

Output

{
 "sub": "1234567890",
 "name": "Ada Lovelace"
}

Benefits

Run JWT Decoder entirely in the browser with no signup or installation.
Keep sensitive sample data private — processing never leaves your device.
Decode header and payload
Show signature segment
Pretty-printed JSON
Pair it with Base64 and Hash Generator when your workflow needs adjacent utilities.

FAQs

No. It only decodes. Never trust a token as authentic from decoding alone.

No. Decoding runs in your browser.

You will see an error describing what failed to parse.

Yes. JWT Decoder on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.

No. JWT Decoder runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.

Inspect JSON Web Tokens by decoding the header and payload. Useful for debugging auth flows - decoding only, no signature verification. It fits everyday crypto & security tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.

Core capabilities include: Decode header and payload; Show signature segment; Pretty-printed JSON; Local-only processing.

Developers often pair JWT Decoder with Base64, Hash Generator, JSON Formatter. Open Related tools on this page for quick links.