GraphQL Koa Middleware

Create a GraphQL HTTP server with Koa.

Port from express-graphql

Install

npm install --save koa-gql

NOTE: koa-graphql has been used by other developer. So use koa-gql instead.

Usage

var koa = require('koa');
var mount = require('koa-mount');
var graphqlHTTP = require('koa-gql');
 
var app = koa();
 
app.use(mount('/graphql', graphqlHTTP({ schema: MyGraphQLSchema })));

NOTE: Below is a copy from express-graphql's README. In this time I implemented almost same api, but it may be changed as time goes on.

HTTP Usage

Once installed at a path, express-graphql will accept requests with the parameters:

• query: A string GraphQL document to be executed.

• variables: The runtime values to use for any GraphQL query variables as a JSON object.

• operationName: If the provided query contains multiple named operations, this specifies which operation should be executed. If not provided, an 400 error will be returned if the query contains multiple named operations.

GraphQL will first look for each parameter in the URL's query-string:

/graphql?query=query+getUser($id:ID){user(id:$id){name}}&variables={"id":"4"}

If not found in the query-string, it will look in the POST request body.

If a previous middleware has already parsed the POST body, the request.body value will be used. Use multer or a similar middleware to add support for multipart/form-data content, which may be useful for GraphQL mutations involving uploading files.

If the POST body has not yet been parsed, graphql-express will interpret it depending on the provided Content-Type header.

• application/json: the POST body will be parsed as a JSON object of parameters.

• application/x-www-form-urlencoded: this POST body will be parsed as a url-encoded string of key-value pairs.

• application/graphql: The POST body will be parsed as GraphQL query string, which provides the query parameter.