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Decode JWT tokens and inspect header, payload, expiry, and claims
Discover the powerful capabilities of our jwt decoder.
Instantly decode and pretty-print the JWT header and payload as formatted JSON
Automatically detect if the token is expired or when it expires, with time remaining
Show the signing algorithm (alg) and token type (typ) from the header
Convert iat, exp, and nbf Unix timestamps to readable date/time strings
Clear error messages for malformed, truncated, or invalid JWT tokens
Your tokens never leave your browser — no server processing, no logging
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Browse All ToolsThe JWT Decoder is a free, browser-based utility designed for developer productivity. Decode JWT tokens and inspect header, payload, expiry, and claims Unlike desktop software that requires installation, this tool runs entirely in your browser — meaning no downloads, no accounts, and no data ever sent to a server. You get instant results right in your tab.
Whether you are a developer, student, writer, or designer, the JWT Decoder saves time by automating repetitive tasks that would otherwise require expensive software or technical knowledge. It is completely free with no usage limits — use it as many times as you need.
There are many tools available online for developer productivity, but the JWT Decoder on AppyGrid stands out for several reasons:
Getting started with the JWT Decoder takes less than a minute. Here is a detailed walkthrough:
Paste Your JWT
Copy a JWT token (starting with eyJ...) and paste it into the input field
Click Decode JWT
Hit the button to decode and display the header, payload, and signature
Inspect the Payload
Review claims like sub, name, iat, exp, and any custom claims in your token
Check Expiry
See if the token is still valid or when it expired
The entire process typically takes under 30 seconds. The JWT Decoder is designed for speed — no waiting for server processing, no upload progress bars, and no page reloads.
The JWT Decoder is used by a wide range of professionals and enthusiasts across different fields. Here are some common use cases:
No matter your background or use case, the JWT Decoder delivers fast, accurate results without the overhead of heavyweight software or complex setup.
Here are detailed answers to the most common questions about the JWT Decoder:
A JSON Web Token (JWT) is a compact, URL-safe token format for representing claims between two parties. It consists of three base64url-encoded parts: a header (algorithm info), a payload (claims/data), and a signature — separated by dots. JWTs are commonly used for authentication and authorization in web applications and APIs.
No. This tool only decodes the header and payload — it does NOT verify the signature. Signature verification requires the secret key or public key used to sign the token. To verify a JWT, use your backend SDK or a tool that has access to the signing key.
The decoding runs entirely in your browser — nothing is sent to any server. However, JWTs can contain sensitive user data. As a best practice, avoid pasting production tokens with real user data into any online tool. Use a test/development token or redact sensitive fields first.
The `exp` claim in a JWT specifies an expiration time (as a Unix timestamp). Once the current time passes this value, the token is considered expired and should be rejected by servers. An expired token cannot be used for authentication even if the signature is valid.
All JWTs start with 'eyJ' because the header is a base64url-encoded JSON object starting with `{"`. The base64url encoding of `{"` is `eyJ`. This is consistent across all JWTs.
`iat` (Issued At) is when the token was created. `exp` (Expiration Time) is when the token expires. `nbf` (Not Before) is the earliest time the token is valid — tokens with a future `nbf` should not be accepted before that time.
AppyGrid is a free online tools platform built for developers, writers, designers, and everyday users. Every tool on AppyGrid — including the JWT Decoder — is free, requires no account, and processes data entirely in your browser. We believe that useful utilities should be accessible to everyone, everywhere, without paywalls or data collection.
The JWT Decoder is one of 38+ free tools available on AppyGrid, covering developer productivity, text processing, image editing, SEO, calculators, and more. Related tags for this tool include: jwt, token, decode, authentication, developer.
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