Toolkit / Developer Tools
JWT Decoder
Decode a JWT header and payload so you can inspect claims, expiration, issuer, audience, and other token details.
Privacy note: Developer inputs are handled locally for supported tools. Avoid pasting production secrets, private keys, or credentials into any tool unless you understand the risk.
Limitations: This tool decodes JWTs; it does not verify signatures.
JWT Decoder
Decode JWT header and payload locally. This does not verify the signature.
Header
{
"alg": "HS256",
"typ": "JWT"
}Payload
{
"sub": "toolkit",
"name": "Toolkit User",
"iat": 1516239022
}How jwt decoder works
Paste a JWT and Toolkit splits the token into header, payload, and signature sections.
Decoded JWT data is readable JSON, but decoding does not prove the token is valid or trusted.
Privacy
Developer inputs are handled locally for supported tools. Avoid pasting production secrets, private keys, or credentials into any tool unless you understand the risk.
Limitations
- This tool decodes JWTs; it does not verify signatures.
- Expired, malformed, or non-JWT tokens may not parse correctly.
- JWTs can contain sensitive user or session data, so handle them carefully.
FAQs
Does decoding a JWT verify it?
No. Decoding only reads the header and payload. Signature verification requires the correct key or secret.
What is inside a JWT?
A JWT usually contains a header, a payload with claims, and a signature.
Can I check token expiration?
Yes, if the token includes an exp claim, you can inspect the expiration timestamp.
Is it safe to paste JWTs?
JWTs may grant access or reveal user data. Only inspect tokens on a trusted device and avoid sharing them.