JWT Decoder API

Name: JWT Decoder API
Author: Br0ski777

by Br0ski777version 1.1.0i★ 0iRuns in the cloud

Registry nameio.github.Br0ski777/jwt-decoder

How to install

Overview

Description from the maker (original English)

Decode JWT tokens â€” inspect header, payload, claims, expiry. x402 micropayment.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: SSE
Category: Other

Install

Pick the AI app you use, then copy the settings.

Passed 2/3 checks · What you ask goes through the maker’s server (jwt-decoder.api.klymax402.com)

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude · about 2 min

No key, nothing to install · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1

Open Claude’s Connectors page
CustomizeConnectors
Done
Click “+ Add” → “Add custom connector” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameJWT Decoder API
Remote MCP server URL · Addresshttps://jwt-decoder.api.klymax402.com/mcp
Leave Authentication as Claude detected it, then click Add
Done
Turn it on in a chat
+ConnectorsJWT Decoder API
Done
Try it
Use JWT Decoder API and tell me what you can do for me, then show me one thing
✓ If Claude says it is using JWT Decoder API or shows a JWT Decoder API tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with ChatGPT on business plans only

ChatGPT Business, Enterprise or Edu on the web, added by a workspace admin or owner · On Free, Plus or Pro: your ChatGPT plan cannot connect MCP yet

Open ChatGPT’s add-MCP page on the web
Plugins+Add custom MCP server
Done
Fill in the name and address
Enter a name, paste the address under Connection, tick the risk warning and click Create as a plugin
Name · NameJWT Decoder API
Connection · Addresshttps://jwt-decoder.api.klymax402.com/mcp
Done
Pick JWT Decoder API in a chat
Start a new chat and pick JWT Decoder API from your plugins before typing
Done
Try it
Use JWT Decoder API and tell me what you can do for me, then show me one thing
✓ If ChatGPT says it is using JWT Decoder API or shows a JWT Decoder API tool in the answer, you are connected

Menu names checked against OpenAI’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Claude Code · about 2 min

No key, nothing to install

Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --transport sse jwt-decoder https://jwt-decoder.api.klymax402.com/mcp

Done

Type /mcp in Claude Code
You should see JWT Decoder API listed as connected
Done
Try it
Use JWT Decoder API and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using JWT Decoder API or shows a JWT Decoder API tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 2 min

No key, nothing to install

Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use JWT Decoder API and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using JWT Decoder API or shows a JWT Decoder API tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 2 min

No key, nothing to install

Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use JWT Decoder API and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using JWT Decoder API or shows a JWT Decoder API tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Addresshttps://jwt-decoder.api.klymax402.com/mcp

JSON settings are under “For developers” below

Stuck? Ask people who use JWT Decoder API💬 Discussion →

For developers: Terminal commands and JSON settings

Over the web

Claude Code

claude mcp add --transport sse jwt-decoder https://jwt-decoder.api.klymax402.com/mcp

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "jwt-decoder": {
      "url": "https://jwt-decoder.api.klymax402.com/mcp"
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "jwt-decoder": {
      "type": "sse",
      "url": "https://jwt-decoder.api.klymax402.com/mcp"
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 0
Downloads per weeki: Not on npm/PyPI
Licence i: No licence stated
Connection: Runs in the cloud
Transport: sse
Latest versioni: 1.1.0
Categoryi: Other
Published to registryi: May 16, 2026
Code last changedi: Sep 3, 2026
Maker: Br0ski777
Repo: Br0ski777/jwt-decoder-x402
Website: github.com
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

Claude ChatGPT Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Open WebUI Raycast

All apps, with pros and cons →

What it can do

The server did not answer when we last checked, so we could not read its tools.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 11, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Br0ski777, which owns the repo
✓ Pass
Still maintained
Code last changed 2 months ago
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
✕ Fail
Endpoint responds
Did not respond within 6 seconds when we checked
– Not applicable
Sign-in with OAuth
Did not respond within 6 seconds when we checked
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Otheri

More stars than 0% of the other 19132 servers in this category
Published to the registry more recently than 8% of the other 19132 servers in this category
Basic checks equal to or better than 41% of the other 19132 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is JWT Decoder API safe?

It passed 2 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed 2 months ago, and the latest version (1.1.0) reached the registry 6 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT Business and above.

What can I use instead?

In the same category: World Monitor, Claude Flow, Tldraw

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

World Monitor

Real-time global intelligence on conflict, markets, energy, trade, shipping and cyber. 102 tools.

by koala73Widely used★ 90.5KUpdated 6 days ago

Runs in the cloud✓ worldmonitor.app

Install

Claude Flow

AI orchestration with hive-mind swarms, neural networks, and 87 MCP tools for enterprise dev.

by ruvnetWidely used↓ 13.5K/wk★ 81.4KUpdated 14 months ago

Runs on your computer

Install

Tldraw

Draw and visually collaborate with your agents on tldraw's canvas.

by tldrawWidely used★ 51.4KUpdated 8 months ago

Runs in the cloud

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

JWT Decoder API

Decode and inspect JWT tokens without verification. Extracts header, payload, claims, expiry, and signature algorithm. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

"mcpServers": { "jwt-decoder": { "url": "https://jwt-decoder.api.klymax402.com/mcp" } } }

Quickstart -- HTTP (x402)

curl -X POST "https://jwt-decoder.api.klymax402.com/api/decode" \

-H "Content-Type: application/json" \ -d '{"token":"..."}'

-> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
`security_decode_jwt`	POST	`/api/decode`	$0.003	Decode a JWT token without signature verification

`security_decode_jwt`

Use this when you need to decode and inspect a JWT token without verifying its signature. Returns the full header, payload, and expiration status.

Parameters

Name	Type	Required	Description
`token`	string	yes	The JWT token to decode (format: header.payload.signature)

Example response:

{"header":{"alg":"RS256","typ":"JWT"},"payload":{"sub":"user123","exp":1720000000},"issuedAt":"2025-01-01T00:00:00Z","expiresAt":"2025-07-03T00:00:00Z","isExpired":false}

When to use: debugging authentication issues, inspecting token claims before API calls, or verifying token expiry. Use this BEFORE making authenticated requests to check if a token needs refreshing.

Not for: hashing data (use crypto_generate_hash), base64 encoding/decoding (use utility_encode_base64), password analysis (use security_check_password).

Example agent prompts

"Decode and inspect a JWT token without verifying its signature"

Payment

Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
Network: Base L2 (eip155:8453)
Asset: USDC
Facilitator: Coinbase CDP (primary), PayAI (fallback)
Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

Catalog: https://klymax402.com/llms.txt
Full API reference: https://klymax402.com/llms-full.txt
Live stats: https://klymax402.com/stats

License

MIT

JWT Decoder API

Overview

What you can do with it

Install

Open Claude’s Connectors page

Click “+ Add” → “Add custom connector” and fill in these 2 fields

Turn it on in a chat

Try it

Open ChatGPT’s add-MCP page on the web

Fill in the name and address

Pick JWT Decoder API in a chat

Try it

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Over the web

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Otheri

Common questions

Alternatives

World Monitor

Claude Flow

Tldraw

README from the maker

JWT Decoder API

Quickstart -- MCP

Quickstart -- HTTP (x402)

-> 402 Payment Required, with an x402 payment challenge in the response body

Tools

security_decode_jwt

Example agent prompts

Payment

Part of klymax402

License

`security_decode_jwt`