# JWT Decoder

> Use this tool when you need to decode and inspect JSON Web Tokens (JWTs) for debugging authentication flows, extracting header and payload information, and verifying expiration times. It accepts a JWT as input and outputs the decoded header, payload, claims, and expiration time. Ideal for troubleshooting authentication issues without requiring the signing secret.

Canonical page: https://skillsregistry.net/skills/br0ski777-jwt-decoder  
JSON: https://api.skillsregistry.net/v1/skills/br0ski777-jwt-decoder

## Description

JWT Decoder parses JSON Web Tokens to extract and display the header, payload, individual claims, and expiration time without requiring the signing secret. Useful for debugging authentication flows. Paid per call in USDC on the Base blockchain via the x402 micropayment protocol.

## Trust

- **Trust score (0–1):** 0.90
- **Verification tier:** verified
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** finance
- **Updated:** 2026-09-19

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/br0ski777-jwt-decoder)
- **Repository:** <https://github.com/br0ski777/jwt-decoder-x402>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "br0ski777-jwt-decoder"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/br0ski777-jwt-decoder` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/br0ski777-jwt-decoder/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt