JWT Decoder & Inspector

Parse, debug, and inspect JWT tokens in real time. Check expiration status with live countdown, converted local timestamps, and claims with zero server transmission.

100% client-side decoding - your secret and payload are never sent to any server.

Samples:
Token Valid (Not Expired)
Expires in 1170 days and 5 hours
exp:1/1/2030, 12:00:00 AM

HEADER: Algorithm & Type

{
  "alg": "HS256",
  "typ": "JWT"
}

SIGNATURE: Crypto Signature

sampleSignatureHashHere1234567890

The signature guarantees cryptographic integrity against tampering when verified with the secret key.

PAYLOAD: Data & Standard Claims

{
  "sub": "1234567890",
  "name": "João Silva",
  "email": "joao.silva@example.com",
  "roles": [
    "user",
    "developer"
  ],
  "iat": 1516239022,
  "exp": 1893456000
}

How to Use

01

Paste the encoded JWT string into the input area or select a sample token.

02

Inspect the top banner to check whether the token is currently valid or expired.

03

Review formatted Header (algorithm) and Payload (user claims and permissions).

04

Copy clean JSON objects with the quick action buttons.

What Is This Tool?

A JSON Web Token (JWT, RFC 7519) is a compact, URL-safe means of representing claims to be transferred between two parties. It is widely used in stateless authentication across REST and GraphQL architectures.

Why It Matters

During OAuth and OpenID Connect development, quickly inspecting token roles, permissions, and lifetime avoids painful debugging cycles.

Developer Tip
Always verify "iat" (issued at) and "exp" (expires at) claims to ensure your application servers are synchronized via NTP.

Frequently Asked Questions

Related Developer Tools

CPF Generator

Generate valid Brazilian CPFs with mask, state region filtering, and bulk support for testing.

Open tool

CNPJ Generator

Generate valid Brazilian CNPJs with realistic mock company profiles (Trade Name, Tax ID, Address, CNAE).

Open tool

Address & CEP Generator

Generate complete Brazilian mock addresses with valid postal codes (CEP), street, city, state, and DDD.

Open tool

UUID / GUID Generator

Generate UUID v4, v7 (RFC 9562 time-ordered), and v1 in bulk with custom casing, hyphens, and formats.

Open tool

JSON Formatter & Validator

Format, minify, validate, and analyze JSON in real time with precise line/column syntax error detection.

Open tool

Base64 Encoder & Decoder

Encode and decode text, hex, and images to Base64/Data URI with UTF-8 and URL-safe support.

Open tool

Hash & Checksum Generator

Generate MD5, SHA-1, SHA-256, SHA-512, CRC-32, and HMAC hashes with live checksum comparator.

Open tool

URL & Query String Parser

Parse URLs, interactively edit query parameters, and strip tracking tags (UTM) in one click.

Open tool

Regex Tester & Matcher

Test regular expressions with visual capture group inspector, replacement tool, and preset library.

Open tool