How can I get list of all types from graphql schema?

Question

On client I get schema by introspectSchema .

In my app I want to get list of all types which we have in schema, but parse existing object is very hard task.

Is there some good way to do it?

Answer 1

GraphQL has powerful introspection capabilities built in. To get the names of the types in your schema you can run this GraphQL query:

{
  __schema {
    types {
      name
    }
  }
}

You can read more about introspection in GraphQL here:

https://graphql.org/learn/introspection/

Answer 2

For parsing constructor object type , you need printSchema , the result will be string type

Here is a code snippet:

  const { introspectSchema } = require('graphql-tools');
  const { printSchema } = require('graphql');

  const schema = await introspectSchema(link);

  const typeDefs = printSchema(schema);

And, you can use merge-graphql-schemas to merge your string type .

source code: https://github.com/mrdulin/apollo-server-express-starter/blob/master/src/remote-schema/helper.js