MCP server for API testing. 35 tools: HTTP, assertions, flows, OpenAPI, collections.
MCP server for API testing. 35 tools: HTTP, assertions, flows, OpenAPI, collections. The api mcp server wraps that behind the Model Context Protocol, so an assistant can use it through 3 defined tools rather than through you.
The most complete MCP server for API testing. Period.
Everything the assistant can do here goes through one of these:
Assertions — The Assertions tool exposed by this serverCollections — The Collections tool exposed by this serverEnvironments — Environments hold your variables — BASE_URL, tokens, API keys — and keep them separated by context. The system has three core concepts:@cocaxcode/api-testing-mcp on npm is all you need. Most clients run it directly, so configuration is a few lines and a restart.
You will need 3 environment variables: TOKEN, API_TESTING_DIR, BASE_URL. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. Api's toolset — Assertions, Collections, Environments — is a fair guide to whether it matches your workflow. It is maintained by cocaxcode; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| Assertions | The Assertions tool exposed by this server. |
| Collections | The Collections tool exposed by this server. |
| Environments | Environments hold your variables — BASE_URL, tokens, API keys — and keep them separated by context. The system has three core concepts: |
{
"mcpServers": {
"api-testing": {
"command": "npx",
"args": ["-y", "@cocaxcode/api-testing-mcp"],
"env": {
"TOKEN": "your-value",
"API_TESTING_DIR": "your-value",
"BASE_URL": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| TOKEN | Credential the server authenticates with. | Yes |
| API_TESTING_DIR | Filesystem location the server is allowed to use. | Optional |
| BASE_URL | Endpoint or connection string the server talks to. | Yes |
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