RESTified GraphQL Endpoints API Reference

Introduction

The RESTified GraphQL API allows for the use of a REST interface to saved GraphQL queries and mutations.

Users specify the query or mutation they wish to make available, as well a URL template. Segments of the URL template can capture data to be used as GraphQL variables.

Examples and quickstart

This page details the API specification for the RESTified GraphQL Endpoints. For examples both with and without parameters and to see a quickstart guide, visit the RESTified Endpoints page.

See Metadata API Reference: RESTified GraphQL Endpoints for information on how to work with endpoints through the Metadata APIs.

Supported from

RESTified endpoints are supported from versions v2.0.0-alpha.1 and above.

Endpoint

Requests are made to /api/rest/** endpoints.

By default these are:

• GET, POST requests for queries, and
• POST requests for mutations

Although not in the REST spirit, POST requests are allowed by default for non-mutation queries since some HTTP clients may not be able to supply a JSON body for GET requests.

If required, users may explicitly configure the HTTP methods allowed per endpoint.

API Spec

Request

Endpoints are determined by the URL templates:

• Simple URLs which don't include any arguments (such as /s1/s2/s3) match literally.
• Segments starting with a : treat these parts of the path like wildcards and use the name to assign a variable. For example: /s1/:id/s3.

The request expects a normal REST style request to the endpoint.

Variables can be supplied via route patterns, url query variables, and request body JSON object keys.

• JSON Body Object values are passed directly to the associated query with no additional validation or type-coercion.
• Route variables and Query parameters are interpreted as scalars according to the variables types in the associated query and passed as JSON data through the query variables:
  • Missing nullable variables are interpreted as NULL
  • Boolean variables are interpreted as Boolean
  • Boolean flags without values e.g. /api/rest/myquery?mybool are interpreted as true
  • String variables are interpreted as String
  • UUID variables are interpreted as String
  • ID variables are interpreted as String
  • Number, Int, Float, and Double variables are interpreted as Number
  • All other types or mismatches currently report variable type errors

When making a request to this API only one endpoint should match. If multiple endpoints match your request this is considered an error and will report so via a 500 status code. If endpoints exist with your path, but none matching your HTTP method then a 405 error will be returned listing the methods that you can use.

Sample requests

GET /api/rest/simple_query/1 HTTP/1.1

POST /api/rest/complicated_mutation/2?time=now HTTP/1.1
Content-Type: application/json

{
     "user": {"name": "Simon"}
}

Response

The response is determined by the saved query. The response will be the same as if you had made the query directly in the GraphQL Console.

See the GraphQL API Reference for more details.

OpenAPI 3 Specification

The OpenAPI 3 specification of the REST endpoints are exposed at /api/swagger/json for admin role only:

GET /api/swagger/json HTTP/1.1
X-Hasura-Role: admin

The response JSON will be a OpenAPI 3 specification (OAS 3.0) for all the RESTified GraphQL Endpoints for admin roles. For more details about OAS 3.0, click here.

Sample request

GET /api/swagger/json HTTP/1.1
X-Hasura-Role: admin

Response

{
  "openapi": "3.0.0",
  "info": {
    "version": "",
    "title": "Rest Endpoints",
    "description": "These OpenAPI specifications are automatically generated by Hasura."
  },
  "paths": {
    "/api/rest/users": {
      "get": {
        "summary": "Fetch user data",
        "description": "This API fetches user data (first name and last name) from the users table.\n***\nThe GraphQl query for this endpoint is:\n```graphql\nquery MyQuery{\n  users {\n    first_name\n    last_name\n  }\n}\n```",
        "responses": {}
      },
      "parameters": [
        {
          "schema": {
            "type": "string"
          },
          "in": "header",
          "name": "x-hasura-admin-secret",
          "description": "Your x-hasura-admin-secret will be used for authentication of the API request."
        }
      ]
    }
  },
  "components": {}
}