# Graphql Playground — REST API endpoint `graphql-playground`

Check a GraphQL query for balanced braces and, when a schema is supplied, unknown fields on Query/Mutation/Subscription types. This is a syntax and field-name check. It does not execute a query and it is not a full GraphQL engine.

- Category: seo
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/graphql-playground/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/api/graphql-playground/
- Same tool on the other surface: https://findutils.com/mcp/graphql-playground/

## Call the endpoint (verified example)

```bash
curl -X POST https://api.findutils.com/api/tools/graphql-playground/execute \
  -H "Content-Type: application/json" \
  -d '{
    "schema": "type Query { user: User }\ntype User { name: String }",
    "query": "{ user { name } }"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/graphql-playground
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `schema` | string | no | Optional GraphQL SDL used to check field names. |
| `query` | string | yes | GraphQL query, mutation, or subscription document. |

Example arguments (verified):

```json
{
  "schema": "type Query { user: User }\ntype User { name: String }",
  "query": "{ user { name } }"
}
```

OpenAPI 3.1 spec: https://findutils.com/api/openapi.json · Interactive docs: https://findutils.com/api/docs/

## Also an MCP tool

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Then ask the client to call `findutils:graphql_playground`. Full MCP reference: https://findutils.com/mcp/graphql-playground/

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