Opaque token strings
A JWT can hide useful Header and Payload details behind three Base64URL segments. JWT Decoder makes those parts readable.
أداة مطورين مجانية
مفكك JWT فاحص رموز محلي
الصق رمز JWT وافحص Header وPayload وSignature وexp وiat وiss وsub محليًا في المتصفح. مفكك JWT لا يرفع الرموز ولا يكسر التواقيع.
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مفكك JWT Problems in API Debugging
JWTs are compact and URL-safe, but they are hard to read when login, OAuth, or API behavior breaks.
Time claim confusion
exp and iat are NumericDate values in seconds, so JWT Decoder converts them into human-readable dates.
Sensitive token handling
Copying production tokens into remote tools can be risky. This JWT Decoder keeps decoding local in the browser.
مفكك JWT Features for Local Inspection
Use JWT Decoder as a focused local viewer for JSON Web Token structure, claims, and debugging context.
Three-part parsing
JWT Decoder separates Header, Payload, and Signature and checks whether all three compact serialization parts are present.
Formatted JSON output
Header and Payload are Base64URL-decoded and pretty-printed as JSON so nested claims are easy to scan.
Registered claim summary
JWT Decoder highlights exp, iat, iss, sub, aud, alg, and typ in compact cards for fast API debugging.
Expiration awareness
The exp claim is converted to a readable date and marked as expired or not expired.
Privacy-first workflow
JWT Decoder runs locally after the page loads and does not send pasted tokens to a server.
No cracking claims
The tool displays the signature segment but does not verify signatures, break encryption, or recover signing secrets.
How to Use مفكك JWT
Paste, inspect, and decide what to debug next without exposing tokens to a server.
01
Paste the JWT token
Copy a token from an Authorization header, login response, OAuth flow, or API test and paste it into JWT Decoder.
- Copy a token from an Authorization header, login response, OAuth flow, or API test and paste it into JWT Decoder.
02
Review structure and JSON
Check whether the token has Header, Payload, and Signature, then read the formatted JSON panels.
- Check whether the token has Header, Payload, and Signature, then read the formatted JSON panels.
03
Inspect claims carefully
Use exp, iat, iss, sub, aud, alg, and typ to understand login state, issuer configuration, and API identity.
- Use exp, iat, iss, sub, aud, alg, and typ to understand login state, issuer configuration, and API identity.
مفكك JWT Workflows
JWT Decoder supports the common debugging loop for APIs, authentication, and learning.
Decode Header and Payload
JWT Decoder reveals the JOSE Header and JWT Payload as formatted JSON, making alg, typ, kid, scopes, and custom claims easier to read.
Check registered claims
JWT Decoder turns exp and iat into human-readable times and surfaces iss and sub for OAuth, SSO, and login troubleshooting.
Keep token viewing local
JWT Decoder is a viewer, not a token cracking service. It performs local decoding and reminds you that trust still depends on proper signature verification.
مفكك JWT Use Cases
A local JWT Decoder is useful whenever compact tokens slow down debugging or teaching.
API debugging
Inspect bearer tokens copied from API clients and logs to understand scopes, audience, issuer, and expiration.
Login debugging
Check why a session appears expired, issued by the wrong service, or tied to an unexpected subject.
OAuth and JWT learning
Show learners how Header, Payload, and Signature fit together without sending example tokens anywhere.
مفكك JWT FAQ
Quick answers about local decoding, signature limits, and JWT claims.
Does JWT Decoder upload my token?
No. Decoding happens in your browser with JavaScript after the page loads.
Does JWT Decoder verify the signature?
No. It displays the signature segment but does not verify trust. Verification requires the correct secret or public key and should happen in your application or server.
Can JWT Decoder crack a JWT secret?
No. JWT Decoder is only for local decoding and viewing. It does not provide cracking, brute force, or secret recovery features.
What are exp and iat?
In JWT, exp is expiration time and iat is issued-at time. They are NumericDate values measured in seconds since 1970-01-01 UTC.
Why can I read the Payload without a key?
Most signed JWT payloads are encoded, not encrypted. Decoding makes claims readable, but it does not prove the token is trustworthy.
Start Using مفكك JWT Locally
Paste a token, inspect its JSON, and debug auth flows without uploading sensitive values.
Viewer only - no signature cracking or token upload.