API Test MCP

Name: API Test MCP
Author: thisis-najeeb

by thisis-najeebversion 1.0.2i★ 0iRuns on your computer

Registry nameio.github.thisis-najeeb/api-test-mcp

How to install

What it does

Call the real API and check the response against your OpenAPI spec.

Connects Runs on your computer
Account or key No key needed
Category Developer tools

Install

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

Passed 3/3 checks · Runs on your computer · ✓ Commands checked Nov 13, 2026

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, with some setup first

Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Let AI install it

Copy this message into a Claude chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server API Test MCP for Claude on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "api-test": { "command": "npx", "args": [ "-y", "api-test-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the API Test MCP tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "api-test": {
      "command": "npx",
      "args": [
        "-y",
        "api-test-mcp"
      ]
    }
  }
}

Done

Quit Claude and open it again
Done
Try it
Use API Test MCP and tell me what you can do for me, then show me one thing
✓ If Claude says it is using API Test MCP or shows a API Test MCP 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

ChatGPT cannot connect API Test MCP yet

API Test MCP runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect API Test MCP

Steps for Claude →Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Node.js on your computer first (one time)
Steps for Cursor →Install Node.js on your computer first (one time)
Steps for VS Code →Install Node.js on your computer first (one time)

B · Others in Developer tools that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Sentry✓ ChatGPT
Compiler Explorer✓ ChatGPT
GitDiagram✓ ChatGPT

Works with Claude Code, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a Claude Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server API Test MCP for Claude Code on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): claude mcp add --scope user api-test -- npx -y api-test-mcp 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the API Test MCP tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --scope user api-test -- npx -y api-test-mcp

Done

Type /mcp in Claude Code
You should see API Test MCP listed as connected
Done
Try it
Use API Test MCP and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using API Test MCP or shows a API Test MCP 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, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a Cursor chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server API Test MCP for Cursor on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "api-test": { "command": "npx", "args": [ "-y", "api-test-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the API Test MCP tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
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 API Test MCP and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using API Test MCP or shows a API Test MCP 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, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a VS Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server API Test MCP for VS Code on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "servers": { "api-test": { "type": "stdio", "command": "npx", "args": [ "-y", "api-test-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the API Test MCP tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
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 API Test MCP and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using API Test MCP or shows a API Test MCP 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 →

JSON settings are under “For developers” below

Stuck? Ask people who use API Test MCP💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user api-test -- npx -y api-test-mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "api-test": {
      "command": "npx",
      "args": [
        "-y",
        "api-test-mcp"
      ]
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "api-test": {
      "command": "npx",
      "args": [
        "-y",
        "api-test-mcp"
      ]
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "api-test": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "api-test-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: 45/wk
Licence i: MIT
Connection: Runs on your computer
Transport: stdio
Latest versioni: 1.0.2
Categoryi: Developer tools
Published to registryi: Sep 1, 2026
Code last changedi: Sep 1, 2026
Maker: thisis-najeeb
Packages: npm: api-test-mcp
Repo: thisis-najeeb/api-test-mcp
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.

Run on your computer in

Claude 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 Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

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 15, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account thisis-najeeb, which owns the repo
✓ Pass
Still maintained
Code last changed 2 months ago
✓ Pass
Has a licence
Uses MIT
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Published vulnerabilities (OSV.dev)

Not checked yet

What we check → · JSON

Makers: ask for a re-check or report wrong info

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 Developer toolsi

More stars than 0% of the other 5916 servers in this category
Published to the registry more recently than 31% of the other 5916 servers in this category
Basic checks equal to or better than 100% of the other 5916 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 API Test MCP safe?

It passed 3 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 on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 2 months ago, and the latest version (1.0.2) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: GitDiagram, Appllama, Cloudflare MCP, Omnara, Repowise

Similar alternatives

Same category, other makers, commands already checked. Official ones first, then by stars.

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

GitDiagram

Architecture diagrams, explanations and Mermaid source for public GitHub repositories.

by ahmedkhaleel2004Widely used★ 18.9KUpdated 2 months ago

Runs in the cloud✓ service owner · gitdiagram.comTried by the PopNx team

How to connect

Appllama

Study screens, flows and paywalls from top-earning iOS apps, then build from what wins.

by AppllamaWidely used★ 5.2KUpdated 3 months ago

Runs in the cloud✓ service owner · appllama.io

How to connect

Cloudflare MCP

Cloudflare MCP servers

by cloudflareWidely used★ 4.5KUpdated 14 months ago

Runs in the cloud✓ service owner · mcp.cloudflare.comTried by the PopNx team

How to connect

Omnara

Deploy durable AI agents with Omnara, an open-source managed-agent platform.

by omnara-aiWidely used★ 3.4KUpdated 2 months ago

Runs in the cloud✓ service owner · omnara.com

How to connect

Repowise

Codebase intelligence for AI coding agents: graph, git history, docs, decisions, code health.

by repowise-devWidely used↓ 6.5K/wk★ 8.1K Stars for the whole repoUpdated 2 days ago

Computer or cloud✓ service owner · repowise.dev

Install

GitDiagram — Runs in the cloud, nothing to install · No key needed
Appllama — Runs in the cloud, nothing to install · No key needed
Cloudflare MCP — Runs in the cloud, nothing to install · No key needed · In Claude’s directory
Omnara — Runs in the cloud, nothing to install · No key needed
Repowise — Cloud or install on your computer · No key needed

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.

api-test-mcp

An MCP server that gives Claude Code, Cursor, Windsurf, or any MCP-compatible AI agent the ability to actually call your API and check the response against what your OpenAPI spec promises — not just read the docs and guess.

No API keys, no config, no cost. Works with any OpenAPI/Swagger 3.x spec (URL or local file).

Why this exists

AI agents are great at reading an OpenAPI spec and writing code against it — but they're guessing about whether the real API actually behaves the way the spec says. This gives an agent (or you, in a normal chat) a way to find out for real: call the live endpoint, and check whether the response actually matches the documented schema.

Install

git clone <this repo>

cd api-test-mcp npm install

Add it to your MCP client config, e.g. for Claude Code:

claude mcp add api-test -- node /absolute/path/to/api-test-mcp/src/index.js

Or in claude_desktop_config.json / Cursor's MCP settings:

"mcpServers": { "api-test": { "command": "node", "args": ["/absolute/path/to/api-test-mcp/src/index.js"] } } }

Tools

Tool	What it does
`load_api_spec`	Load and dereference an OpenAPI/Swagger spec from a URL or local path. Returns the API title, servers, and every documented endpoint. Call this first.
`list_endpoints`	List every endpoint currently loaded.
`call_endpoint`	Make a real HTTP call to a documented endpoint. Returns the real status, headers, and body.
`validate_response`	Check a response body against the JSON schema documented for a given method + path + status.
`test_endpoint`	`call_endpoint` + `validate_response` in one step. The main tool — "does this endpoint actually work as documented?"
`run_all_tests`	Best-effort contract-test pass across every GET endpoint that needs no required parameters. Pass `includeMutating: true` to also auto-generate example params/bodies from the schema and attempt POST/PUT/PATCH (off by default — it can write real data). Endpoints still needing manual input are listed as skipped, with the reason.
`check_health`	One-shot ping across a set of endpoints (or every parameter-free GET in the loaded spec): reports reachability and latency. Handy before a demo or as a CI step.
`diff_api_specs`	Compare two versions of a spec (e.g. an old tag vs. `main`) and flag likely-breaking changes — removed endpoints, newly-required fields, type changes, removed enum values — versus safe additive changes.

All of the above accept an optional auth preset (bearer, apiKey in a header or query param, or basic) so authenticated APIs aren't limited to hand-building raw headers, and an optional timeoutMs.

Example (what an agent conversation looks like)

You: Load my API spec at https://api.example.com/openapi.json and check whether /users/{id} actually returns what it documents.

Agent: *(calls load_api_spec, then test_endpoint with a real user id)* → "Called it — got a 200, but the response is missing the created_at field your spec marks as required, and role is documented as an enum of 3 values but the API returned "superadmin", which isn't one of them."

For an authenticated API:

You: Run a full contract-test pass against my staging API using this bearer token, and include the write endpoints.

Agent: *(calls run_all_tests with { auth: { type: "bearer", token: "..." }, includeMutating: true })* → "12 passed, 2 failed, 3 skipped. POST /orders failed schema validation — total_cents came back as a string, not the integer your spec documents."

Tested against real live traffic

npm test runs three real, unmocked checks, no canned fixtures pretending to be a server:

test/smoke-test.js — loads a spec, makes real HTTPS calls to a live public API, validates the real response, and deliberately feeds in a broken response to confirm validation actually catches mismatches (not just a happy-path check).
test/new-features-test.js — auth presets applied to a real outgoing request URL, a real network timeout/abort, a real health-check call, and deterministic offline tests for the spec-diff logic.
test/mcp-protocol-test.js — spawns the actual MCP server as a subprocess and talks to it over the real MCP protocol, the same way Claude Code or Cursor would.

CI runs the full suite on every push/PR against Node 18, 20, and 22.

Roadmap

v1.0 shipped contract testing, auth presets, auto-generated example data for mutating endpoints, spec diffing, and health checks. Ideas for what's next:

YAML output mode / a small CLI wrapper for non-MCP use
Configurable retry/backoff for flaky endpoints in run_all_tests and check_health
Pattern-aware example generation (respect JSON Schema pattern instead of a placeholder string)
Persisted health-check history (currently one-shot only)

Contributions welcome — see CONTRIBUTING.md. See an endpoint type or spec quirk this doesn't handle well? Open an issue.

License

MIT

API Test MCP

What it does

Install

Install Node.js (if you don’t have it)

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js (if you don’t have it)

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js (if you don’t have it)

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js (if you don’t have it)

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

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

Published vulnerabilities (OSV.dev)

Discussion

User reviews

Compared with others in Developer toolsi

Common questions

Similar alternatives

GitDiagram

Appllama

Cloudflare MCP

Omnara

Repowise

README from the maker

api-test-mcp

Why this exists

Install

Tools

Example (what an agent conversation looks like)

Tested against real live traffic

Roadmap

License