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<h1 id="introspection"><a class="header" href="#introspection">Introspection</a></h1>
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<blockquote>
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<p>The <a href="https://spec.graphql.org/October2021#sec-Schema-Introspection">schema introspection</a> system is accessible from the meta-fields <code>__schema</code> and <code>__type</code> which are accessible from the type of the root of a query operation.</p>
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<pre><code class="language-graphql">__schema: __Schema!
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__type(name: String!): __Type
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</code></pre>
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<p>Like all meta-fields, these are implicit and do not appear in the fields list in the root type of the query operation.</p>
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</blockquote>
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<p><a href="https://graphql.org">GraphQL</a> provides <a href="https://spec.graphql.org/October2021#sec-Introspection">introspection</a>, allowing to see what <a href="https://spec.graphql.org/October2021#sel-GAFRJBABABF_jB">queries</a>, <a href="https://spec.graphql.org/October2021#sel-GAFRJDABABI5C">mutations</a> and <a href="https://spec.graphql.org/October2021#sel-GAFRJFABABMvpN">subscriptions</a> a <a href="https://graphql.org">GraphQL</a> server supports at runtime.</p>
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<p>Because <a href="https://spec.graphql.org/October2021#sec-Introspection">introspection</a> queries are just regular <a href="https://spec.graphql.org/October2021#sel-GAFRJBABABF_jB">GraphQL queries</a>, <a href="https://docs.rs/juniper">Juniper</a> supports them natively. For example, to get all the names of the types supported, we could <a href="https://spec.graphql.org/October2021#sec-Execution">execute</a> the following <a href="https://spec.graphql.org/October2021#sel-GAFRJBABABF_jB">query</a> against <a href="https://docs.rs/juniper">Juniper</a>:</p>
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<pre><code class="language-graphql">{
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__schema {
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types {
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name
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}
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}
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}
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</code></pre>
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<h2 id="disabling"><a class="header" href="#disabling">Disabling</a></h2>
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<blockquote>
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<p>Disabling introspection in production is a widely debated topic, but we believe it’s one of the first things you can do to harden your GraphQL API in production.</p>
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</blockquote>
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<p><a href="https://www.apollographql.com/blog/why-you-should-disable-graphql-introspection-in-production">Some security requirements and considerations</a> may mandate to disable <a href="https://spec.graphql.org/October2021#sec-Schema-Introspection">GraphQL schema introspection</a> in production environments. In <a href="https://docs.rs/juniper">Juniper</a> this can be achieved by using the <a href="https://docs.rs/juniper/0.16.1/juniper/struct.RootNode.html#method.disable_introspection"><code>RootNode::disable_introspection()</code></a> method:</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">extern crate juniper;
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</span><span class="boring">use juniper::{
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</span><span class="boring"> graphql_object, graphql_vars, EmptyMutation, EmptySubscription, GraphQLError,
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</span><span class="boring"> RootNode,
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</span><span class="boring">};
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</span><span class="boring">
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</span>pub struct Query;
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#[graphql_object]
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impl Query {
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fn some() -> bool {
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true
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}
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}
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type Schema = RootNode<'static, Query, EmptyMutation, EmptySubscription>;
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fn main() {
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let schema = Schema::new(Query, EmptyMutation::new(), EmptySubscription::new())
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.disable_introspection();
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let query = "query { __schema { queryType { name } } }";
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match juniper::execute_sync(query, None, &schema, &graphql_vars! {}, &()) {
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Err(GraphQLError::ValidationError(errs)) => {
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assert_eq!(
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errs.first().unwrap().message(),
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"GraphQL introspection is not allowed, but the operation contained `__schema`",
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);
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}
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res => panic!("expected `ValidationError`, returned: {res:#?}"),
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}
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}</code></pre></pre>
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<blockquote>
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<p><strong>NOTE</strong>: Attempt to execute an <a href="https://spec.graphql.org/October2021#sec-Schema-Introspection">introspection query</a> results in <a href="https://spec.graphql.org/October2021#sec-Validation">validation</a> error, rather than <a href="https://spec.graphql.org/October2021#sec-Execution">execution</a> error.</p>
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