GraphQL Query Builder

Build a simple GraphQL query or mutation from fields and arguments.

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GraphQL Output

About GraphQL Query Builder

This GraphQL query builder helps you assemble a simple query or mutation from fields and arguments.

It is useful for API exploration, schema demos, onboarding docs and quick experiments when you want a readable GraphQL starting point without typing every brace manually.

GraphQL Query Structure

// Basic query syntax:
query OperationName {
  rootField(argument: value) {
    nestedField1
    nestedField2
  }
}

// Example - Query:
query GetUser {
  user(id: 1) {
    id
    name
    email
    posts {
      title
      content
    }
  }
}

// Example - Mutation:
mutation CreateUser {
  createUser(input: {name: "John", email: "[email protected]"}) {
    id
    name
  }
}

GraphQL Argument Types

TypeExampleDescription
IDid: 1Unique identifier
Stringname: "John"Text value
Intage: 25Integer number
Floatprice: 19.99Decimal number
Booleanactive: truetrue or false
Enumstatus: ACTIVEPredefined value
Input Objectinput: {name: "J"}Complex object

Query vs Mutation Comparison

AspectQueryMutation
PurposeRead/fetch dataModify/create data
ExecutionParallelSerial (one at a time)
KeywordOptional (can omit)Required
REST equivalentGETPOST/PUT/DELETE
Return typeAny typeUsually the modified object

Frequently Asked Questions

What is GraphQL query syntax?
GraphQL queries start with operation type (query/mutation), followed by optional operation name, then selection set in braces. Fields are listed inside. Arguments go in parentheses after field name. Example: query GetUser { user(id: 1) { id name email } }. Fields return nested objects or scalars.
What is the difference between query and mutation?
Query is for reading data (GET equivalent), mutation is for modifying data (POST/PUT/DELETE equivalent). Queries can run in parallel, mutations execute serially. Convention: queries use 'query' keyword (can be omitted for simple queries), mutations always use 'mutation' keyword. Example mutation: mutation CreateUser { createUser(name: "John") { id } }.
How do GraphQL arguments work?
Arguments are key-value pairs in parentheses after field names. Types include: Int, Float, String, Boolean, ID, enums, input objects. Example: user(id: 1, includePosts: true, limit: 10). Multiple arguments are comma-separated. Argument values can be variables: user(id: $userId).
What are GraphQL fragments and when to use them?
Fragments are reusable field selections defined once and referenced with ...fragmentName. Useful for shared field sets across queries. Example: fragment UserFields on User { id name email }. Query: query { user { ...UserFields posts { ...UserFields } } }. Reduces duplication in complex queries.
What are GraphQL directives?
Directives modify query execution. Built-in: @include(if: Boolean) includes field only if true, @skip(if: Boolean) skips field if true. Example: user { id name email @include(if: $includeEmail) }. Custom directives can be defined in schema. Directives enable conditional field fetching.
How do you handle GraphQL errors and null values?
GraphQL returns partial data on error. Nullable fields return null on error, non-nullable (field!) cause parent to bubble null. Example: type User { id: ID! name: String }. If name resolver fails, entire User object becomes null. Error array in response contains error details with message, locations, path.