{SafeJSON}
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JWT Decoder

Inspect JWT headers and payloads locally. Debug auth claims, check exp/iss/aud, and verify token structure without uploading pasted JWT content. Use 5 free runs before upgrading.

ProJWT Decoder is a Pro feature. Free for occasional use, unlimited with Pro.
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JWT Token

JWT

Paste a JWT token and click Decode

How JWT works

HEADER

Algorithm & token type. Base64URL-encoded JSON.

PAYLOAD

Claims and data. Not encrypted - anyone can decode it.

SIGNATURE

Verifies the token hasn't been tampered with.

Pro Feature

Keep your tokens safe

JWT tokens contain session data and auth claims. SafeJSON Pro decodes them locally with no pasted-content upload — $5/month, cancel anytime.

View PricingBack to Formatter

Verify local processing · Security guide · Pricing

About SafeJSON JWT Decoder

SafeJSON JWT Decoder decodes JWT headers and claims in the browser. Do not paste production secrets unless your policy allows local inspection.

Is it safe to paste a real JWT token into SafeJSON?
SafeJSON JWT Decoder is designed for sensitive JWT inspection. The token is decoded in the browser workflow with no pasted-content upload. For production JWTs that contain sensitive claims, verify local processing with DevTools Network before relying on any decoder.
How to verify that SafeJSON JWT Decoder does not upload your token?
Open SafeJSON JWT Decoder, open DevTools (F12) and go to the Network tab. Paste a JWT token and decode it. Check that no network request contains your token.
How does the JWT Decoder work?
SafeJSON decodes the JWT header and payload using base64url decoding. It displays the decoded JSON in a tree view and raw format. The signature is shown but not cryptographically verified; SafeJSON is a decoder, not a validator.
Why shouldn't I paste a production JWT into a server-side decoder?
Server-side JWT decoders can transmit your token to a remote server for processing. If the token is a production access token or contains sensitive claims, that information can end up on third-party infrastructure. A browser-local decoder reduces that exposure.
What JWT claims can I see?
The decoder displays standard and custom claims from the JWT payload, including sub, iss, aud, exp, iat, nbf, and custom claims. The header shows the algorithm (alg) and token type (typ).