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https://facebook.github.io/graphql
GraphQL is a query language and execution engine tied to any backend service.
https://facebook.github.io/graphql
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GraphQL is a query language and execution engine tied to any backend service.
- Host: GitHub
- URL: https://facebook.github.io/graphql
- Owner: graphql
- Created: 2015-07-01T01:26:56.000Z (over 9 years ago)
- Default Branch: main
- Last Pushed: 2024-04-07T16:31:07.000Z (7 months ago)
- Last Synced: 2024-04-14T05:13:53.203Z (7 months ago)
- Language: Shell
- Homepage: https://spec.graphql.org
- Size: 3.71 MB
- Stars: 14,211
- Watchers: 520
- Forks: 1,117
- Open Issues: 217
-
Metadata Files:
- Readme: README.md
- Changelog: changelogs/October2021.md
- Contributing: CONTRIBUTING.md
Awesome Lists containing this project
- awesome-graphql - facebook/graphql - Working Draft of the Specification for GraphQL created by Facebook. (Specification)
- awesome-graphql - facebook/graphql - Working Draft of the Specification for GraphQL created by Facebook. (Specification)
README
[](https://graphql.org/conf/2024/?utm_source=github&utm_medium=graphql_spec&utm_campaign=readme)
# GraphQL
The GraphQL specification is edited in the markdown files found in
[`/spec`](./spec) the latest release of which is published at
https://graphql.github.io/graphql-spec/.
The latest draft specification can be found at
https://graphql.github.io/graphql-spec/draft/ which tracks the latest commit to
the main branch in this repository.
Previous releases of the GraphQL specification can be found at permalinks that
match their [release tag](https://github.com/graphql/graphql-spec/releases). For
example, https://graphql.github.io/graphql-spec/October2016/. If you are linking
directly to the GraphQL specification, it's best to link to a tagged permalink
for the particular referenced version.
## Overview
This is a Working Draft of the Specification for GraphQL, a query language for
APIs created by Facebook.
The target audience for this specification is not the client developer, but
those who have, or are actively interested in, building their own GraphQL
implementations and tools.
In order to be broadly adopted, GraphQL will have to target a wide variety of
backend environments, frameworks, and languages, which will necessitate a
collaborative effort across projects and organizations. This specification
serves as a point of coordination for this effort.
Looking for help? Find resources
[from the community](https://graphql.org/community/).
## Getting Started
GraphQL consists of a type system, query language and execution semantics,
static validation, and type introspection, each outlined below. To guide you
through each of these components, we've written an example designed to
illustrate the various pieces of GraphQL.
This example is not comprehensive, but it is designed to quickly introduce the
core concepts of GraphQL, to provide some context before diving into the more
detailed specification or the
[GraphQL.js](https://github.com/graphql/graphql-js) reference implementation.
The premise of the example is that we want to use GraphQL to query for
information about characters and locations in the original Star Wars trilogy.
### Type System
At the heart of any GraphQL implementation is a description of what types of
objects it can return, described in a GraphQL type system and returned in the
GraphQL Schema.
For our Star Wars example, the
[starWarsSchema.ts](https://github.com/graphql/graphql-js/blob/main/src/__tests__/starWarsSchema.ts)
file in GraphQL.js defines this type system.
The most basic type in the system will be `Human`, representing characters like
Luke, Leia, and Han. All humans in our type system will have a name, so we
define the `Human` type to have a field called "name". This returns a String,
and we know that it is not null (since all `Human`s have a name), so we will
define the "name" field to be a non-nullable String. Using a shorthand notation
that we will use throughout the spec and documentation, we would describe the
human type as:
```graphql
type Human {
name: String
}
```
This shorthand is convenient for describing the basic shape of a type system;
the JavaScript implementation is more full-featured, and allows types and fields
to be documented. It also sets up the mapping between the type system and the
underlying data; for a test case in GraphQL.js, the underlying data is a
[set of JavaScript objects](https://github.com/graphql/graphql-js/blob/main/src/__tests__/starWarsData.ts),
but in most cases the backing data will be accessed through some service, and
this type system layer will be responsible for mapping from types and fields to
that service.
A common pattern in many APIs, and indeed in GraphQL is to give objects an ID
that can be used to refetch the object. So let's add that to our Human type.
We'll also add a string for their home planet.
```graphql
type Human {
id: String
name: String
homePlanet: String
}
```
Since we're talking about the Star Wars trilogy, it would be useful to describe
the episodes in which each character appears. To do so, we'll first define an
enum, which lists the three episodes in the trilogy:
```graphql
enum Episode {
NEWHOPE
EMPIRE
JEDI
}
```
Now we want to add a field to `Human` describing what episodes they were in.
This will return a list of `Episode`s:
```graphql
type Human {
id: String
name: String
appearsIn: [Episode]
homePlanet: String
}
```
Now, let's introduce another type, `Droid`:
```graphql
type Droid {
id: String
name: String
appearsIn: [Episode]
primaryFunction: String
}
```
Now we have two types! Let's add a way of going between them: humans and droids
both have friends. But humans can be friends with both humans and droids. How do
we refer to either a human or a droid?
If we look, we note that there's common functionality between humans and droids;
they both have IDs, names, and episodes in which they appear. So we'll add an
interface, `Character`, and make both `Human` and `Droid` implement it. Once we
have that, we can add the `friends` field, that returns a list of `Character`s.
Our type system so far is:
```graphql
enum Episode {
NEWHOPE
EMPIRE
JEDI
}
interface Character {
id: String
name: String
friends: [Character]
appearsIn: [Episode]
}
type Human implements Character {
id: String
name: String
friends: [Character]
appearsIn: [Episode]
homePlanet: String
}
type Droid implements Character {
id: String
name: String
friends: [Character]
appearsIn: [Episode]
primaryFunction: String
}
```
One question we might ask, though, is whether any of those fields can return
`null`. By default, `null` is a permitted value for any type in GraphQL, since
fetching data to fulfill a GraphQL query often requires talking to different
services that may or may not be available. However, if the type system can
guarantee that a type is never null, then we can mark it as Non Null in the type
system. We indicate that in our shorthand by adding an "!" after the type. We
can update our type system to note that the `id` is never null.
Note that while in our current implementation, we can guarantee that more fields
are non-null (since our current implementation has hard-coded data), we didn't
mark them as non-null. One can imagine we would eventually replace our hardcoded
data with a backend service, which might not be perfectly reliable; by leaving
these fields as nullable, we allow ourselves the flexibility to eventually
return null to indicate a backend error, while also telling the client that the
error occurred.
```graphql
enum Episode {
NEWHOPE
EMPIRE
JEDI
}
interface Character {
id: String!
name: String
friends: [Character]
appearsIn: [Episode]
}
type Human implements Character {
id: String!
name: String
friends: [Character]
appearsIn: [Episode]
homePlanet: String
}
type Droid implements Character {
id: String!
name: String
friends: [Character]
appearsIn: [Episode]
primaryFunction: String
}
```
We're missing one last piece: an entry point into the type system.
When we define a schema, we define an object type that is the basis for all
query operations. The name of this type is `Query` by convention, and it
describes our public, top-level API. Our `Query` type for this example will look
like this:
```graphql
type Query {
hero(episode: Episode): Character
human(id: String!): Human
droid(id: String!): Droid
}
```
In this example, there are three top-level operations that can be done on our
schema:
- `hero` returns the `Character` who is the hero of the Star Wars trilogy; it
takes an optional argument that allows us to fetch the hero of a specific
episode instead.
- `human` accepts a non-null string as a query argument, a human's ID, and
returns the human with that ID.
- `droid` does the same for droids.
These fields demonstrate another feature of the type system, the ability for a
field to specify arguments that configure their behavior.
When we package the whole type system together, defining the `Query` type above
as our entry point for queries, this creates a GraphQL Schema.
This example just scratched the surface of the type system. The specification
goes into more detail about this topic in the "Type System" section, and the
[type](https://github.com/graphql/graphql-js/blob/main/src/type) directory in
GraphQL.js contains code implementing a specification-compliant GraphQL type
system.
### Query Syntax
GraphQL queries declaratively describe what data the issuer wishes to fetch from
whoever is fulfilling the GraphQL query.
For our Star Wars example, the
[starWarsQueryTests.js](https://github.com/graphql/graphql-js/blob/main/src/__tests__/starWarsQuery-test.ts)
file in the GraphQL.js repository contains a number of queries and responses.
That file is a test file that uses the schema discussed above and a set of
sample data, located in
[starWarsData.js](https://github.com/graphql/graphql-js/blob/main/src/__tests__/starWarsData.ts).
This test file can be run to exercise the reference implementation.
An example query on the above schema would be:
```graphql
query HeroNameQuery {
hero {
name
}
}
```
The initial line, `query HeroNameQuery`, defines a query with the operation name
`HeroNameQuery` that starts with the schema's root query type; in this case,
`Query`. As defined above, `Query` has a `hero` field that returns a
`Character`, so we'll query for that. `Character` then has a `name` field that
returns a `String`, so we query for that, completing our query. The result of
this query would then be:
```json
{
"hero": {
"name": "R2-D2"
}
}
```
Specifying the `query` keyword and an operation name is only required when a
GraphQL document defines multiple operations. We therefore could have written
the previous query with the query shorthand:
```graphql
{
hero {
name
}
}
```
Assuming that the backing data for the GraphQL server identified R2-D2 as the
hero. The response continues to vary based on the request; if we asked for
R2-D2's ID and friends with this query:
```graphql
query HeroNameAndFriendsQuery {
hero {
id
name
friends {
id
name
}
}
}
```
then we'll get back a response like this:
```json
{
"hero": {
"id": "2001",
"name": "R2-D2",
"friends": [
{
"id": "1000",
"name": "Luke Skywalker"
},
{
"id": "1002",
"name": "Han Solo"
},
{
"id": "1003",
"name": "Leia Organa"
}
]
}
}
```
One of the key aspects of GraphQL is its ability to nest queries. In the above
query, we asked for R2-D2's friends, but we can ask for more information about
each of those objects. So let's construct a query that asks for R2-D2's friends,
gets their name and episode appearances, then asks for each of _their_ friends.
```graphql
query NestedQuery {
hero {
name
friends {
name
appearsIn
friends {
name
}
}
}
}
```
which will give us the nested response
```json
{
"hero": {
"name": "R2-D2",
"friends": [
{
"name": "Luke Skywalker",
"appearsIn": ["NEWHOPE", "EMPIRE", "JEDI"],
"friends": [
{ "name": "Han Solo" },
{ "name": "Leia Organa" },
{ "name": "C-3PO" },
{ "name": "R2-D2" }
]
},
{
"name": "Han Solo",
"appearsIn": ["NEWHOPE", "EMPIRE", "JEDI"],
"friends": [
{ "name": "Luke Skywalker" },
{ "name": "Leia Organa" },
{ "name": "R2-D2" }
]
},
{
"name": "Leia Organa",
"appearsIn": ["NEWHOPE", "EMPIRE", "JEDI"],
"friends": [
{ "name": "Luke Skywalker" },
{ "name": "Han Solo" },
{ "name": "C-3PO" },
{ "name": "R2-D2" }
]
}
]
}
}
```
The `Query` type above defined a way to fetch a human given their ID. We can use
it by hard-coding the ID in the query:
```graphql
query FetchLukeQuery {
human(id: "1000") {
name
}
}
```
to get
```json
{
"human": {
"name": "Luke Skywalker"
}
}
```
Alternately, we could have defined the query to have a query parameter:
```graphql
query FetchSomeIDQuery($someId: String!) {
human(id: $someId) {
name
}
}
```
This query is now parameterized by `$someId`; to run it, we must provide that
ID. If we ran it with `$someId` set to "1000", we would get Luke; set to "1002",
we would get Han. If we passed an invalid ID here, we would get `null` back for
the `human`, indicating that no such object exists.
Notice that the key in the response is the name of the field, by default. It is
sometimes useful to change this key, for clarity or to avoid key collisions when
fetching the same field with different arguments.
We can do that with field aliases, as demonstrated in this query:
```graphql
query FetchLukeAliased {
luke: human(id: "1000") {
name
}
}
```
We aliased the result of the `human` field to the key `luke`. Now the response
is:
```json
{
"luke": {
"name": "Luke Skywalker"
}
}
```
Notice the key is "luke" and not "human", as it was in our previous example
where we did not use the alias.
This is particularly useful if we want to use the same field twice with
different arguments, as in the following query:
```graphql
query FetchLukeAndLeiaAliased {
luke: human(id: "1000") {
name
}
leia: human(id: "1003") {
name
}
}
```
We aliased the result of the first `human` field to the key `luke`, and the
second to `leia`. So the result will be:
```json
{
"luke": {
"name": "Luke Skywalker"
},
"leia": {
"name": "Leia Organa"
}
}
```
Now imagine we wanted to ask for Luke and Leia's home planets. We could do so
with this query:
```graphql
query DuplicateFields {
luke: human(id: "1000") {
name
homePlanet
}
leia: human(id: "1003") {
name
homePlanet
}
}
```
but we can already see that this could get unwieldy, since we have to add new
fields to both parts of the query. Instead, we can extract out the common fields
into a fragment, and include the fragment in the query, like this:
```graphql
query UseFragment {
luke: human(id: "1000") {
...HumanFragment
}
leia: human(id: "1003") {
...HumanFragment
}
}
fragment HumanFragment on Human {
name
homePlanet
}
```
Both of those queries give this result:
```json
{
"luke": {
"name": "Luke Skywalker",
"homePlanet": "Tatooine"
},
"leia": {
"name": "Leia Organa",
"homePlanet": "Alderaan"
}
}
```
The `UseFragment` and `DuplicateFields` queries will both get the same result,
but `UseFragment` is less verbose; if we wanted to add more fields, we could add
it to the common fragment rather than copying it into multiple places.
We defined the type system above, so we know the type of each object in the
output; the query can ask for that type using the special field `__typename`,
defined on every object.
```graphql
query CheckTypeOfR2 {
hero {
__typename
name
}
}
```
Since R2-D2 is a droid, this will return
```json
{
"hero": {
"__typename": "Droid",
"name": "R2-D2"
}
}
```
This was particularly useful because `hero` was defined to return a `Character`,
which is an interface; we might want to know what concrete type was actually
returned. If we instead asked for the hero of Episode V:
```graphql
query CheckTypeOfLuke {
hero(episode: EMPIRE) {
__typename
name
}
}
```
We would find that it was Luke, who is a Human:
```json
{
"hero": {
"__typename": "Human",
"name": "Luke Skywalker"
}
}
```
As with the type system, this example just scratched the surface of the query
language. The specification goes into more detail about this topic in the
"Language" section, and the
[language](https://github.com/graphql/graphql-js/blob/main/src/language)
directory in GraphQL.js contains code implementing a specification-compliant
GraphQL query language parser and lexer.
### Validation
By using the type system, it can be predetermined whether a GraphQL query is
valid or not. This allows servers and clients to effectively inform developers
when an invalid query has been created, without having to rely on runtime
checks.
For our Star Wars example, the file
[starWarsValidationTests.js](https://github.com/graphql/graphql-js/blob/main/src/__tests__/starWarsValidation-test.ts)
contains a number of demonstrations of invalid operations, and is a test file
that can be run to exercise the reference implementation's validator.
To start, let's take a complex valid query. This is the `NestedQuery` example
from the above section, but with the duplicated fields factored out into a
fragment:
```graphql
query NestedQueryWithFragment {
hero {
...NameAndAppearances
friends {
...NameAndAppearances
friends {
...NameAndAppearances
}
}
}
}
fragment NameAndAppearances on Character {
name
appearsIn
}
```
And this query is valid. Let's take a look at some invalid queries!
When we query for fields, we have to query for a field that exists on the given
type. So as `hero` returns a `Character`, we have to query for a field on
`Character`. That type does not have a `favoriteSpaceship` field, so this query:
```graphql
# INVALID: favoriteSpaceship does not exist on Character
query HeroSpaceshipQuery {
hero {
favoriteSpaceship
}
}
```
is invalid.
Whenever we query for a field and it returns something other than a scalar or an
enum, we need to specify what data we want to get back from the field. Hero
returns a `Character`, and we've been requesting fields like `name` and
`appearsIn` on it; if we omit that, the query will not be valid:
```graphql
# INVALID: hero is not a scalar, so fields are needed
query HeroNoFieldsQuery {
hero
}
```
Similarly, if a field is a scalar, it doesn't make sense to query for additional
fields on it, and doing so will make the query invalid:
```graphql
# INVALID: name is a scalar, so fields are not permitted
query HeroFieldsOnScalarQuery {
hero {
name {
firstCharacterOfName
}
}
}
```
Earlier, it was noted that a query can only query for fields on the type in
question; when we query for `hero` which returns a `Character`, we can only
query for fields that exist on `Character`. What happens if we want to query for
R2-D2s primary function, though?
```graphql
# INVALID: primaryFunction does not exist on Character
query DroidFieldOnCharacter {
hero {
name
primaryFunction
}
}
```
That query is invalid, because `primaryFunction` is not a field on `Character`.
We want some way of indicating that we wish to fetch `primaryFunction` if the
`Character` is a `Droid`, and to ignore that field otherwise. We can use the
fragments we introduced earlier to do this. By setting up a fragment defined on
`Droid` and including it, we ensure that we only query for `primaryFunction`
where it is defined.
```graphql
query DroidFieldInFragment {
hero {
name
...DroidFields
}
}
fragment DroidFields on Droid {
primaryFunction
}
```
This query is valid, but it's a bit verbose; named fragments were valuable above
when we used them multiple times, but we're only using this one once. Instead of
using a named fragment, we can use an inline fragment; this still allows us to
indicate the type we are querying on, but without naming a separate fragment:
```graphql
query DroidFieldInInlineFragment {
hero {
name
... on Droid {
primaryFunction
}
}
}
```
This has just scratched the surface of the validation system; there are a number
of validation rules in place to ensure that a GraphQL query is semantically
meaningful. The specification goes into more detail about this topic in the
"Validation" section, and the
[validation](https://github.com/graphql/graphql-js/blob/main/src/validation)
directory in GraphQL.js contains code implementing a specification-compliant
GraphQL validator.
### Introspection
It's often useful to ask a GraphQL schema for information about what queries it
supports. GraphQL allows us to do so using the introspection system!
For our Star Wars example, the file
[starWarsIntrospectionTests.js](https://github.com/graphql/graphql-js/blob/main/src/__tests__/starWarsIntrospection-test.ts)
contains a number of queries demonstrating the introspection system, and is a
test file that can be run to exercise the reference implementation's
introspection system.
We designed the type system, so we know what types are available, but if we
didn't, we can ask GraphQL, by querying the `__schema` field, always available
on the root type of a Query. Let's do so now, and ask what types are available.
```graphql
query IntrospectionTypeQuery {
__schema {
types {
name
}
}
}
```
and we get back:
```json
{
"__schema": {
"types": [
{
"name": "Query"
},
{
"name": "Character"
},
{
"name": "Human"
},
{
"name": "String"
},
{
"name": "Episode"
},
{
"name": "Droid"
},
{
"name": "__Schema"
},
{
"name": "__Type"
},
{
"name": "__TypeKind"
},
{
"name": "Boolean"
},
{
"name": "__Field"
},
{
"name": "__InputValue"
},
{
"name": "__EnumValue"
},
{
"name": "__Directive"
}
]
}
}
```
Wow, that's a lot of types! What are they? Let's group them:
- **Query, Character, Human, Episode, Droid** - These are the ones that we
defined in our type system.
- **String, Boolean** - These are built-in scalars that the type system
provided.
- **`__Schema`, `__Type`, `__TypeKind`, `__Field`, `__InputValue`,
`__EnumValue`, `__Directive`** - These all are preceded with a double
underscore, indicating that they are part of the introspection system.
Now, let's try and figure out a good place to start exploring what queries are
available. When we designed our type system, we specified what type all queries
would start at; let's ask the introspection system about that!
```graphql
query IntrospectionQueryTypeQuery {
__schema {
queryType {
name
}
}
}
```
and we get back:
```json
{
"__schema": {
"queryType": {
"name": "Query"
}
}
}
```
And that matches what we said in the type system section, that the `Query` type
is where we will start! Note that the naming here was just by convention; we
could have named our `Query` type anything else, and it still would have been
returned here if we had specified it as the starting type for queries. Naming it
`Query`, though, is a useful convention.
It is often useful to examine one specific type. Let's take a look at the
`Droid` type:
```graphql
query IntrospectionDroidTypeQuery {
__type(name: "Droid") {
name
}
}
```
and we get back:
```json
{
"__type": {
"name": "Droid"
}
}
```
What if we want to know more about Droid, though? For example, is it an
interface or an object?
```graphql
query IntrospectionDroidKindQuery {
__type(name: "Droid") {
name
kind
}
}
```
and we get back:
```json
{
"__type": {
"name": "Droid",
"kind": "OBJECT"
}
}
```
`kind` returns a `__TypeKind` enum, one of whose values is `OBJECT`. If we asked
about `Character` instead:
```graphql
query IntrospectionCharacterKindQuery {
__type(name: "Character") {
name
kind
}
}
```
and we get back:
```json
{
"__type": {
"name": "Character",
"kind": "INTERFACE"
}
}
```
We'd find that it is an interface.
It's useful for an object to know what fields are available, so let's ask the
introspection system about `Droid`:
```graphql
query IntrospectionDroidFieldsQuery {
__type(name: "Droid") {
name
fields {
name
type {
name
kind
}
}
}
}
```
and we get back:
```json
{
"__type": {
"name": "Droid",
"fields": [
{
"name": "id",
"type": {
"name": null,
"kind": "NON_NULL"
}
},
{
"name": "name",
"type": {
"name": "String",
"kind": "SCALAR"
}
},
{
"name": "friends",
"type": {
"name": null,
"kind": "LIST"
}
},
{
"name": "appearsIn",
"type": {
"name": null,
"kind": "LIST"
}
},
{
"name": "primaryFunction",
"type": {
"name": "String",
"kind": "SCALAR"
}
}
]
}
}
```
Those are our fields that we defined on `Droid`!
`id` looks a bit weird there, it has no name for the type. That's because it's a
"wrapper" type of kind `NON_NULL`. If we queried for `ofType` on that field's
type, we would find the `String` type there, telling us that this is a non-null
String.
Similarly, both `friends` and `appearsIn` have no name, since they are the
`LIST` wrapper type. We can query for `ofType` on those types, which will tell
us what these are lists of.
```graphql
query IntrospectionDroidWrappedFieldsQuery {
__type(name: "Droid") {
name
fields {
name
type {
name
kind
ofType {
name
kind
}
}
}
}
}
```
and we get back:
```json
{
"__type": {
"name": "Droid",
"fields": [
{
"name": "id",
"type": {
"name": null,
"kind": "NON_NULL",
"ofType": {
"name": "String",
"kind": "SCALAR"
}
}
},
{
"name": "name",
"type": {
"name": "String",
"kind": "SCALAR",
"ofType": null
}
},
{
"name": "friends",
"type": {
"name": null,
"kind": "LIST",
"ofType": {
"name": "Character",
"kind": "INTERFACE"
}
}
},
{
"name": "appearsIn",
"type": {
"name": null,
"kind": "LIST",
"ofType": {
"name": "Episode",
"kind": "ENUM"
}
}
},
{
"name": "primaryFunction",
"type": {
"name": "String",
"kind": "SCALAR",
"ofType": null
}
}
]
}
}
```
Let's end with a feature of the introspection system particularly useful for
tooling; let's ask the system for documentation!
```graphql
query IntrospectionDroidDescriptionQuery {
__type(name: "Droid") {
name
description
}
}
```
yields
```json
{
"__type": {
"name": "Droid",
"description": "A mechanical creature in the Star Wars universe."
}
}
```
So we can access the documentation about the type system using introspection,
and create documentation browsers, or rich IDE experiences.
This has just scratched the surface of the introspection system; we can query
for enum values, what interfaces a type implements, and more. We can even
introspect on the introspection system itself. The specification goes into more
detail about this topic in the "Introspection" section, and the
[introspection](https://github.com/graphql/graphql-js/blob/main/src/type/introspection.ts)
file in GraphQL.js contains code implementing a specification-compliant GraphQL
query introspection system.
### Additional Content
This README walked through the GraphQL.js reference implementation's type
system, query execution, validation, and introspection systems. There's more in
both [GraphQL.js](https://github.com/graphql/graphql-js/) and specification,
including a description and implementation for executing queries, how to format
a response, explaining how a type system maps to an underlying implementation,
and how to format a GraphQL response, as well as the grammar for GraphQL.
### Contributing to this repo
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([GraphQL Specification Membership agreement](https://preview-spec-membership.graphql.org)
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If you have issues, please email
[[email protected]](mailto:[email protected]).
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