Apollo graphql context. Next, create an Apollo Server .

• Apollo graphql context The GraphQL query language is implemented as a reference implementation in JavaScript by Facebook, while Apollo Server builds on it to simplify building GraphQL servers in JavaScript. req and context. Putting authenticated user info on By default, the useQuery hook checks the Apollo Client cache to see if all the data you requested is already available locally. If Apollo Server receives a request with a query string that matches a previous request, the associated document might already be available in Apollo Server's cache. context["contextual"]}`); // Writes 42 to the router log at info level 4 // Rhai also supports extended dot notation for indexed variables, so this is equivalent 5 Mar 20, 2025 · Thus, when using @graphql-yoga/node, it is possible to access context. Rather, it uses Apollo's store in order to reactively deliver updates to your query results. The benefit of doing authorization like this is that we can short-circuit our resolvers and not even call lookup functions when we don't have permission to use them, limiting the possible errors that could expose sensitive data. objects from the Sequelize ORM have their data in a dataValues field of an object. In GraphQL Modules, context is available as the third argument to each resolver and is shared across modules: Jan 26, 2023 · BatchHttpLink is always going to put all of the queries in to the same request and will provide the first operation’s context to the rest of the operations. Most REST APIs don't support Overview and setup What is GraphQL? Strawberry Hello world Apollo Sandbox Explorer Building a schema The Query entry point REST as a data source The context Resolvers & data sources GraphQL arguments A playlist's tracks Resolver chains Mutation response Mutation input Sep 12, 2016 · To demonstrate how to wire our web socket GraphQL subscription package with Apollo Client and a JavaScript GraphQL server, we’ll go through how subscriptions work in GitHunt, our example app for context: GraphQL operation の resolver 全体で共有されるオブジェクト。このチュートリアルでは認証情報やデータソースを context で共有している。 このチュートリアルでは認証情報やデータソースを context で共有している。 As the value of contextType, we'll pass the filepath to our context. In GraphQL, a context is an object shared by all the resolvers of a specific execution. ts file is located in the same src folder, so our path is ". 3 fn supergraph_service(service) {4 const request_callback = Fn("process_request"); // This is standard Rhai functionality for creating a function pointer 5 service. Handling errors. tsx file is pretty bare-bones: import &quot;. Railway will also deploy it automatically each time new code is pushed to your Github Repo. As i am developing a gql server backend using Apollo server (v2. Similar to React's Context. See more details. import {setContext} from 'apollo-link-context' // This option is passed through to the fetch implementation used by the HttpLink when sending the query. Resolvers should never destructively modify the context Jun 23, 2021 · Hi, I’ve been trying to get GraphQL subscriptions working in my Meteor/Apollo stack for some time and I’ve finally managed to get it working, but I don’t really understand why it’s working and if I’ve done anything wrong. Reusing the Transaction example, imagine a subgraph responsible for the User and Currency types: Mar 9, 2023 · In apollo-server 3, I was able to set the context when creating the apollo server like this: const server = new ApolloServer({ debug: true, schema: executableSchema, context: contextFunction(secretValues), Oct 21, 2023 · I am using @apollo/server with express and authenticating with passport but i am not getting any req. i used jwt for this and followed the apollo server documentation to implement same. /src/types. Jan 11, 2023 · Yes, there are specific examples of how to do this in Migrating to Apollo Server 4 - Apollo GraphQL Docs. yaml that will use the Rhai script: Nov 8, 2022 · We'll look at an example of how to implement authentication and authorization in a GraphQL server. Note: You can read more about Apollo’s authentication here. Apollo Client helps you consume a GraphQL API, with support for the most popular You connect Apollo Client to React with the ApolloProvider component. It receives two arguments: the GraphQL request being executed, and the previous context. To do this, you must first export the interface you pass to Apollo Server as a generic type parameter for typing your context value: Feb 1, 2018 · { options: { context: { canHazPancakes: true //this will not reach the server } } } Adding the middleware. In this article, we saw how to particularly hook an Express middleware that mutate the initial request to open the door to Apollo to build a context with the injected information. However, we recommend avoiding using context. /styles. You can use context to share per-operation state, including authentication data, dataloader instances, etc. subgraph. It seems like the best option I've come up with so far. Apollo is a suite of tools to create a GraphQL server, and to consume a GraphQL API. Each of the app's resolvers looks up the active user's ID and role The app puts the active user's ID and role on each GraphQL operation's shared context object The app extracts an authorization token from the HTTP headers of each incoming client request Every incoming operation must provide an authorization token as a non-nullable GraphQL argument GraphQL's declarative nature enables easy adaptation of UI components to new data without backend changes. headers. How Apollo Server processes GraphQL operations. So we need to be able to identify whether the request is a Am I correct in assuming that the reason the context object in my middleware is not a reference to the same class instance in my datasources are a result of me using graphql-middleware library and not something underlying with @apollo/server's code? Mar 24, 2018 · Apollo Logo courtesy of apollographql. A monograph is a graph consisting of a single GraphQL service that clients query directly. If you're using dataloaders to batch requests across resolvers, you can attach them to the context as well. In GraphQL, the context argument is shared across all resolvers that are executing for a particular operation. Looking for Apollo Federation directives? See Federation-specific GraphQL directives. Here is some code of my app. Let's explore Apollo in detail, both Apollo Client and Apollo Server. @apollo/server is the main library for Apollo Server itself. The default value is /graphql. The default value is false. res wherever possible and instead favor context. Apollo Client helps 8 // Modify the operation context with a new Jan 19, 2021 · Apollo Server; I have a NextAuth set up in my app, and I am able to log in just fine. When using Apollo Link, you define network behavior as a collection of link objects that execute in sequence to control the flow of data. res within the GraphQL resolvers or the user context factory function. The Next. My initial plan was to parse those messages and evict specific entities from my cache, so that Apollo Graphql re-fetches them automatically. apollogr Apollo Server uses a publish-subscribe (pub/sub) model to track events that update active subscriptions. js app in which I intend to consume several graphql-apis. GraphQL Adoption Guides. GraphOS Router is the GraphOS runtime plane and a client's entry point to your federated supergraph. Can be shared across multiple GraphQL servers. First we’ll briefly cover the performance of a typical Redux setup so that we can compare. /context". context["contextual"] = 42; // Adds value 42 to the context with key "contextual" 3 print(`${request. Here's my current code: For mutating the event before passing off to @apollo/server or mutating the result right before returning, middleware can be utilized. While this works, it just feels wrong. Apollo Server uses graphql-tools version 4. This enables each previous link in your link chain to interact with the response before it's returned. That was so much work. Note that this context is not included in the terminating link's request to the GraphQL server or other destination. New in Apollo Client 3, reactive variables are a useful mechanism for representing local state outside of the Apollo Client cache. Apollo Server is an open-source, spec-compliant GraphQL server that's compatible with any GraphQL client, including Apollo Client. This link makes it easy to perform the asynchronous lookup of things like authentication tokens and more. Monographs have a single GraphQL schema that represents the API's entire dataset. The graphql-tools library enables the creation and manipulation of GraphQL schema. The second expressMiddleware signature requires that options receives a context property. the first parameter for the rootQuery): context: An object passed to the resolvers, following the graphql specification or a function that accepts the : operation and returns the resolver context. Works within a GraphQL; context. Apollo Server uses many of these functions internally, and it re-exports all of them to support advanced use cases. It's the best way to build a production-ready, self-documenting GraphQL API that can use data from any source. Instead, you can run operations against your server using a combination of any HTTP or GraphQL client such as supertest or Apollo Client's HTTP Link. It enables you to manage both local and remote data with GraphQL. This enables resolvers to share helpful context values, such as a database connection. Oct 22, 2024 · A resolver can optionally accept four positional arguments: (parent, args, context, info). user || null Jan 18, 2023 · I am using apollo server 4, The root cause seems to be the nginx reverse-proxy in front of my graphql backend. Authentication is determining whether a given user is logged in, and subsequently determining which user someone is. Finally, the context is then available as the third parameter passed to your resolver function. Next, create an Apollo Server Routing with GraphOS Router Secure, observe, and scale your supergraph runtime. Authorization is then determining what a given user has permission to do or see. Finally, to point to the type we defined in the file, we can tack on #DataSourceContext to the end of the file path. This means that Apollo Server expects the context object's type to be the same as the user-provided context function's type. fetch Function Apollo Client supports the following protocols for subscriptions: WebSocket, using one of the following subprotocols: graphql-ws. The setContext function accepts a function that returns either an object or a promise, which then returns an object to set the new context of a request. Introduction 1. Apollo Client can encounter a variety of errors when executing operations on your GraphQL server. Notice that this example doesn't define resolvers for User fields (id and name). executeOperation accepts context value ; Oct 22, 2023 · The context argument. authorization || ‘’; const user = await getUser(token); return { user }; }, I want to do the same but using the cookie such as : context: async ({ req, res }) => { const cookie = req. Provider. But, it isn’t yet sending Context data to the resolvers. The use case is that we would like to add DataLoaders (request-specific caching mechanisms) to the context for queries, but not mutations. Docs Search Apollo content (Cmd+K or /) 24 25 const { url} = await startStandaloneServer (server, {26 context: Jan 18, 2023 · Hello, A lot of documentation shows that we can get the authorization token from the header inside the context function like : context: async ({ req, res }) => { const token = req. e. 7. WebSocket I'm building an next. 8), i am in need to implement authentication for my gql endpoints. Below is an example of writing an end-to-end test using the @apollo/server and supertest packages: The setContext function accepts a function that returns either an object or a promise, which then returns an object to set the new context of a request. Oct 22, 2023 · When layering GraphQL over REST APIs, it's most helpful to have a resource cache that: Saves data across multiple GraphQL requests. In main. Note, this middleware is strictly for event and result mutations and should not be used for any GraphQL modification. We're going to explain this in more detail in the next section. Persisted queries also require you to create and link a PQL, and to configure your router to receive persisted query requests. Modify the context object and then write it back with operation. includeExtensions Boolean: If true, includes the extensions field in operations sent to your GraphQL endpoint. 11 and later) You must use the same protocol as the GraphQL endpoint you're communicating with. Let’s see how it works in our code: first, we get the authentication token from localStorage if it exists; after that, we return the headers to the context so httpLink can read them. The router will insert the status of JWT processing into the request context (apollo::authentication::jwt_status). <service>. This status is Customizing requests and responses. // 2: You’re exporting the context object, so that it can be imported and used by the GraphQL server. . Learn more about these arguments. The args argument is an object that contains all GraphQL arguments that were provided for the field by the GraphQL operation. 📣 Apollo Server 4 changes the syntax for defining a context function. Apollo Link includes installable, premade links that support a variety of use cases. request, as it is more future-proof and platform independent (as Node. If two otherwise identical queries have different hardcoded argument values, they're considered entirely different operations by your GraphQL server's cache. – Works within a GraphQL context. The gateway can modify the details of an incoming request before executing it across your subgraphs. if using the popular 'cors' package from npm in node. Introduction to Apollo; Apollo Client. The tools provided by Apollo are mainly three: Client, Server, Engine. For each subgraph request, copy header values from context into the subgraph request. Jan 29, 2021 · GraphQL context. Apollo Server is able to accept a schema that has been enabled by graphql-tools. If all data is available locally, useQuery returns that data and doesn't query your GraphQL server. js req and res objects are passed along to the context function. It’s useful for keeping data such as authentication info, the current user, database connection, data sources and other things you need for running your business logic. css&quot;; import { createRoot } from&hellip; Context typing for resolvers. This component can be imported directly from the @apollo/react-common package where it lives, or from one of the @apollo/react-hooks, @apollo/react-components, and @apollo/react-hoc packages. You can also configure GraphQL Code Generator to add a type for the context your resolvers share, ensuring TypeScript warns you if you attempt to use a value that doesn't exist. cors Object Each subscription operation can subscribe to only one field of the Subscription type. The @fromContext directive can't reference a @context defined in another subgraph. Via this websockets channel I’d be sending information what entities in my cache need to be refreshed. Otherwise, it returns null. Right now it's typed as 1 // At the supergraph_service stage, register callbacks for processing requests and 2 // responses. getContext(). You can specify a different fetch policy for a given Jun 15, 2024 · It seems like I finally got Apollo setup working, with subscriptions, and context for both queries and subscriptions. If I directly request the graphql backend, i get the following header with the cookie : {host: ‘localhost:8002’, … accept: ‘/’, ‘sec-fetch-site’: ‘same-origin’, ‘sec-fetch-mode’: ‘cors’, ‘sec-fetch-dest Jan 11, 2023 · Yes, there are specific examples of how to do this in Migrating to Apollo Server 4 - Apollo GraphQL Docs. user object in my context, i even hard code the user object in my context but not getting anything in my resolvers. Enabling subscriptions. Here's an example: Oct 22, 2023 · The graphql-tools library provides helpful functions (such as makeExecutableSchema above) for creating and manipulating GraphQL schemas. The subscription service can resolve fields that are included in a published message's payload, but it will need to reach out to the federated data graph to resolve additional non-payload fields. // 1: First you have defined the Context interface, which specifies what objects will be attached to the context object. Click to return to the live site. I have my Context function in new ApolloServer(), but the code in it never gets called. Note: the backend must also allow credentials from the requested origin. Aug 16, 2022 · My solution is to setup an additional channel of communication via websockets. For example, your subgraphs might all use the same authorization token to associate an incoming request with a particular user. Once your Github Repo has connected to Railway, Railway should immediately begin deploying it. The parsingDidStart event fires whenever Apollo Server will parse a GraphQL request to create its associated document AST. Jul 29, 2020 · I'm using apollo server with typescript and I'm having trouble getting the context parameter inside of my resolver to pick up that the name property on context is a string. ts file. setContext(newContext) or operation. path string: The path for Apollo Server to listen on. context: A graph API's context is an object that's shared among every resolver in a GraphQL request. Can also be a function that accepts an Operation object and returns the string URL to use for that operation. You most likely would need to tweak that code to support what you’re trying to do. Oct 22, 2023 · Your GraphQL API probably needs to control which users can see and interact with the various data it provides. It wraps your React app . The problem is coming from trying to get access to the user's session in the Apollo context. 1 // You can interact with request. There are also community packages available such as apollo-server-integration-testing which provides an API similar to the deprecated apollo-server-testing package which uses mocked Express request and response objects. This approach relies on the fact that each request has a context object that can store data for the duration of that request: For each subgraph response, copy header values into context. The context function should be asynchronous and return an object. The GraphQLWsLink is a terminating link that's used most commonly with GraphQL subscriptions (which usually communicate over WebSocket), although you can send queries and mutations over WebSocket as well. ts file, relative to the . map_request(request_callback); // Register the request callback 6 const response GraphQL APIs are often referred to simply as graphs. It is correctly connecting to my resolvers and returning data to the client. Provider, ApolloProvider wraps your React app and places Apollo Client on the context, enabling you to access it from anywhere in your component tree. This cache-first policy is Apollo Client's default fetch policy. <custom Apollo Server doesn't provide built-in support for this at this time. Batching with REST APIs. An Apollo Server integration for use with Fastify. Additionally, you can define instruments on graphql for each JSON element returned to the client. Here is the full server & client code. cookie Obtain the current context object by calling operation. Is there a better approach for NestJS' DI and Apollo GraphQL context? We recommend reading Apollo Link overview before learning about individual links. What am I missing? import {ApolloServer} from '@apollo/server'; import {startStandaloneServer} from '@apollo/server May 9, 2024 · Hi there! I am trying to figure out how I can add something to the Apollo Server context (one of the 4 positional arguments) AFTER the document has been parsed but before any resolvers get going. js HTTP servers adopt the Fetch Response API). Example router. Server code: import { ApolloServer } from "apollo-server" import { makeExecutableSchema } from "graphql-tools" import Jan 29, 2021 · Since like many developers, we use Apollo in the context of a React application, we should also look at the effect our field policy data access approach will have on our application’s performance. Apollo Client, Apollo iOS, Apollo Kotlin, Apollo GraphOS: Backend Developers: GraphQL: provides a powerful layer to unify data from various backend sources, including databases, REST APIs, and microservices, into a single, consistent API Making errors actionable on the client and server The context function. The default value for framework-specific packages (apollo-server-express, apollo-server-fastify, etc) is /graphql. For example, suppose you call watchQuery on a GraphQL query that fetches a person's first and last name and this person has a particular object identifier, provided by May 15, 2020 · When building out a distributed GraphQL architecture with Apollo Federation, we will often need to limit query access based on who requested the data (authentication) and whether they’re allowed to see or change the data they requested (authorization). com. To define a custom instrument, add a new key to router. A directive decorates part of a GraphQL schema or operation with additional configuration. Feb 12, 2025 · I am trying to set up a simple React front-end that uses ApolloClient to hit an existing GraphQL server I have running locally. Nov 30, 2018 · What I did do is add req to the context object. Learn how Apollo Client simplifies GraphQL data management to help build web apps Apollo Client is a comprehensive state management library for JavaScript. This object is then accessible to your server's resolvers and plugins using the name contextValue. You can use Apollo Server as: The GraphQL server for a subgraph in a federated supergraph Apollo Links allow us to create middlewares that modify requests before they are sent to the server. Right now it’s just an instance of PrismaClient, but this can change as the project grows. The default value for apollo-server and serverless-specific packages (apollo-server-lambda, etc) is /. Apollo server directly exports all the function from graphql-tools, enabling a migration path for more complicated use cases. g. E. I want to pass my user's session into every resolver. jsx, let's wrap our React app with an ApolloProvider. Connect your client to React. Tools like Apollo Server (and Apollo Client) can read a GraphQL document's directives and perform custom logic as appropriate. Configure your project 2. e. js const apolloServer = new ApolloServer({ schema, context: ({ req }) => { // const user = "John Doe" //hard-coded const user = req. This example looks almost the same as the previous one, with one addition: it expects the roles array on a user to include an admin role. The graphql-subscriptions library (included in every apollo-server package) provides the PubSub class as a basic in-memory event bus to help you get started: Oct 22, 2023 · You can combine any HTTP or GraphQL client such as supertest or Apollo Client's HTTP Link to run operations against your server. Mar 19, 2018 · A complete introduction to Apollo, the GraphQL toolkit . Because they're separate from the cache, reactive variables can store data of any type and structure, and you can interact with them anywhere in your application without using GraphQL syntax. Apollo Server knows how to turn HTTP requests and responses into GraphQL operations and run them in an extensible context with support for plugins and other features. Build a project with Apollo. Oct 22, 2024 · The server middleware instance to integrate with : Apollo Server. Apollo Server uses the TContext type to represent the generic type of the GraphQL context object. js, the following settings would work in tandem with the above apollo client settings: Option Description; schema: An executable graphql schema: rootValue: The root value that is passed to the resolvers (i. context Function: An optional asynchronous context initialization function. setContext((prevContext) => newContext). Directives are preceded by the @ character Let's learn how to connect Apollo Client to React so we can start building query components with React Apollo. Apollo Server 4 supports incremental delivery directives such as @defer and @stream (when combined with an appropriate version of graphql-js), and so the structure of response. The URL of the GraphQL endpoint to send requests to. This article explains the different graphs you can build and their typical use cases. Subscriptions are not supported by Apollo Server 4's startStandaloneServer function. The ApolloProvider is similar to React's Context. Feb 4, 2019 · I now get DI working in my DataSource, and can use DI within the resolvers to include my DataSource instances (instead of accessing from the GraphQL context). Beyond reusability, hardcoded arguments have other disadvantages relative to variables: Reduced cache effectiveness. context as an indexed variable 2 request. Note that this method is not an implementation of GraphQL subscriptions. I’m sure there are things that can be improved. this. This is a simple package that easily allows you to connect your own Fastify server implementation to an Apollo Server instance. Apollo has a specific middleware for setting the context apollo-link-context (the same can be achieved with a more general middleware). Since GraphQL is a query language, its transport layer and data format is not set in stone. Subgraph service - Handles a request after it has been sent to the . We'll use the HTTP Authorization request header to log in users, and we'll use field-level authorization to control user permissions to parts of the schema. By default, Apollo Client uses Apollo Link's HttpLink to send GraphQL queries over HTTP. The definition of context scopes can only exist in one subgraph schema. Jun 3, 2024 · I have this setup for ApolloServer with subscriptions. 4. To connect Apollo Client to React, you will need to use the ApolloProvider component exported from @apollo/react-hooks. I would like to pass a context when using the useQuery from @apollo/react-hooks in my components. Feb 27, 2023 · 6. yaml as telemetry. Disadvantages of hardcoded GraphQL arguments. Apollo Server includes graphql-tools version 4. However, you can use contexts to share data across subgraphs using the @external reference. Use case Jan 16, 2023 · let me begin for thanking you for your time and attention Will think about it and test out the different solutions you have depicted, good to stumble on these noob problems now as a lot of js frameworks are adopting new render and hydration methods, this is also my first contact with graphQL and Apollo still a lvl0 noob The rest of this article details these steps. The user can change the value at any time, so we'll need to fetch the value on the fly. HttpLink distinguishes between client errors, server errors, and You are viewing a deploy preview. In this video we'll explore adding a custom Apollo Link that updates our request headers using the value from a custom context provider. body can represent either a single result or multiple results. The index. https://www. Alternatively you can use the exported function fastifyApolloHandler which can be passed into any Fastify route handler Jan 22, 2025 · Context. Jul 25, 2024 · Here, we're using this method to access our graph API's context. Right now, all you need to know is that the context is useful for storing user information. Monographs. The context function. instruments. . Our context. That works fine for queries and mutations, but currently The response object returned from executeOperation is a GraphQLResponse, which has body and http fields. This Route Handler will be accessible at /api/graphql. schema, path = "/", graphql_ide = "apollo-sandbox", context_getter = context_getter Copy Strawberry automatically calls the context_getter on every request and passes the result to the resolvers via the info argument , which we'll tackle in the next lesson. Provides cache management features like expiry and invalidation that use standard HTTP cache control headers. Sep 10, 2017 · I know express-graphql actually uses the request as the context if it's not defined in the options -- Apollo's middleware may very well behave the same way but that's unclear for the documentation. context: ({req, res}) => ({req, res}) This makes it possible to access the express req/res from within the graphql resolvers and datasource. The context argument is useful for passing things that any resolver might need, like authentication scope, database connections, and custom fetch functions. The easy way is to just only pass the particular parts of context that are actually needed by your data source to the data source’s constructor directly, which avoids creating a circular reference entirely. You can also create your own The ApolloProvider component leverages React's Context API to make a configured Apollo Client instance available throughout a React component tree. The context is available as the 3rd argument to each resolver: Jan 28, 2019 · GraphQL context is crucial in a GraphQL architecture to bring external information in the graph for wise data resolving. If you see stuff that can be improved, please let me know. We want to pass a custom header with our HTTP request whereby the value is saved in context. The router extracts all claims from the validated JWT and includes them in the request's context (apollo::authentication::jwt_claims), making them available to your router customizations, such as Rhai scripts. This document only describes the steps that need to be taken by the client to create a manifest of the client's operations and send persisted query requ After your GraphQL endpoint (successfully) responds with the result of the sent operation, HttpLink sets it as the response field of the operation context. Start a React app; Get started with Apollo Boost; Create an ApolloClient object; Apollo Links graphql (also known as graphql-js) is the library that implements the core GraphQL parsing and execution algorithms. subscriptions-transport-ws (⚠️ unmaintained) HTTP, using chunked multipart responses (Apollo Client 3. The context function should return an object that all your server's resolvers share during an operation's execution. rkpocth fcsliqg nuyjjz fekvf lfoqfh szrwzs tch wkbqx zrjic oamdc tnhjf eta ydb wmwhnt ahjms