GraphQL Query Builder
Build a simple GraphQL query or mutation from fields and arguments.
Back to all tools on ToolForge
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
| Type | Example | Description |
|---|---|---|
| ID | id: 1 | Unique identifier |
| String | name: "John" | Text value |
| Int | age: 25 | Integer number |
| Float | price: 19.99 | Decimal number |
| Boolean | active: true | true or false |
| Enum | status: ACTIVE | Predefined value |
| Input Object | input: {name: "J"} | Complex object |
Query vs Mutation Comparison
| Aspect | Query | Mutation |
|---|---|---|
| Purpose | Read/fetch data | Modify/create data |
| Execution | Parallel | Serial (one at a time) |
| Keyword | Optional (can omit) | Required |
| REST equivalent | GET | POST/PUT/DELETE |
| Return type | Any type | Usually 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.