If you open up the docs tab on the right side, you’ll see that GraphQL playground has pulled all the possible resolvers that our server supports. Now that we know how to do queries, implementing mutations seems like an easy task. The login mutation. Mutations. Mutations# Most discussions of GraphQL focus on data fetching, but any complete data platform needs a way to modify server-side data as well. In REST, any request might end up causing some side-effects on the server, but by convention it's suggested that one doesn't use GET requests to modify data. I showed you how to build a GraphQL server using the GraphQL .NET library and tested the API with some queries from the GraphQL playground. Implementing Mutations. GraphQL can do more than just query data. We define the Query, Mutation and User GraphQL … We need to add a mutation property to our type definition and implement it in the resolvers. { "slug": "example" } Here is my code for the Query Variables (bottom left in GQL playground). Notice that we're returning the Song type from this mutation.Song is defined in the schema as follows: This is usually a slow process and there are two servers to … You can use the GraphQL playground at localhost:4000/graphql to test the queries and mutations described in this post. I use passing variables using GraphQL playground all the time. The name of the mutation is addSong and takes in three arguments: a non-nullable string for title, a nullable boolean value for whether the song was a numberOne hit, and a non-nullable string for performerName.We can assume that the mutation adds this new song to a database. It will look something like: https://example.us-west-2.aws.cloud.dgraph.io/graphql. An experiment on microservices using Graphql queries and mutations. Files have to be uploaded to REST first, then the resulting upload URL is passed in the GraphQL mutation. I am following Andrew Mead's tutorial on Gatsby and for some reason I am having trouble with passing query variables to the query via GraphQL playground. Now let's start! GraphQL operations can be of two types, queries and mutations. The process of designing mutations is described in the article on GraphQL mutations. Mutations and Subscriptions. Using this method adds another layer of complexity. Inside graphql mutations it is possible to upload files in graphql using a separate REST API. Since we don’t have anything in our database, let’s do a mutation first. We would like a user to be able to login into our app. Now that we have the new queries and mutations, we can go to the Playground and make a new query and new mutation. - msusur/graphql-playground The Star Wars example we’re using provides one mutation example (adding a review) and one subscription example (getting notified when a review is added). As far as I can tell, the query works on node, as the contents of the 'blog' are being populated. Before you can successfully call the TimeLine Service from the GraphQL playground you must acquire an authentication token and configure the GraphQL Playground "HTTP HEADERS" tab (bottom of the playground interface) to pass it as a header with your calls to the TimeLine Service.. To configure the "HTTP HEADERS" area to properly pass your authentication token, configure it as follows: In this article, I'll introduce you to GraphQL mutation. 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