GraphQL Schema to Apache Avro Converter
Convert GraphQL Schema Definition Language (SDL) types, enums, and fields into Apache Avro record definitions in your browser.
At a glance
GraphQL Schema to Apache Avro Converter transforms GraphQL Schema Definition Language (SDL) object types, enums, lists, and scalars into valid Apache Avro (.avsc) schema records. It maps GraphQL scalars, list arrays, enums, and nullable fields into Avro union structures purely inside client-side browser memory.
100% Client-Side In-Browser GraphQL to Avro Transpiler
Compile GraphQL Schema Definition Language (SDL) types, inputs, enums, lists, and scalars directly into Apache Avro (.avsc) JSON schemas with zero server uploads.
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How GraphQL SDL Maps to Apache Avro
GraphQL SDL provides strongly-typed schema declarations for web client queries and mutations. Apache Avro (.avsc) is the standard schema format for Kafka event streams and big data storage. This tool maps GraphQL types, fields, and nullability into compliant Avro JSON schemas:
| GraphQL SDL Syntax | Apache Avro (.avsc) Mapping | Nullability & Default Behavior |
|---|---|---|
| Int! / Float! | "int" / "double" | Mandatory numeric fields map directly to Avro 32-bit int and 64-bit double primitives. |
| String! / ID! / Boolean! | "string" / "boolean" | Text, IDs, and boolean flags map directly to Avro string and boolean types. |
| field: Type (nullable) | ["null", Type], default: null | Optional GraphQL fields map to Avro nullable unions with null as the first item and default: null. |
| [Type!]! | { "type": "array", "items": Type } | Non-null lists with non-null elements map to direct Avro array schemas. |
| [Type] | ["null", { "type": "array", ... }] | Nullable lists map to nullable unions wrapping Avro array schemas. |
| enum Role { ADMIN USER } | { "type": "enum", "name": "Role", ... } | GraphQL enums map to Avro enum definitions with symbol string arrays. |
| """Docstring""" | "doc": "Docstring" | GraphQL block descriptions are preserved in Avro record and field doc attributes. |
Why Use This GraphQL Schema to Apache Avro Converter?
How to Use GraphQL Schema to Apache Avro Converter
Paste GraphQL SDL
Paste your GraphQL schema definition language into the editor or select a pre-configured template.
Configure Avro Options
Customize your target Avro namespace and JSON indentation preferences.
Copy or Download Avro
Copy the generated Apache Avro JSON schema directly to your clipboard or download as a .avsc file.
GraphQL Schema to Apache Avro example
Transforms GraphQL UserProfile type into a compliant Apache Avro record with non-null ID/Username and nullable Bio union.
type UserProfile {
id: ID!
username: String!
bio: String
}
{
"type": "record",
"name": "UserProfile",
"namespace": "com.example.graphql",
"fields": [
{ "name": "id", "type": "string" },
{ "name": "username", "type": "string" },
{ "name": "bio", "type": ["null", "string"], "default": null }
]
}
Technical Specifications & Engine Details
| Specification | Details |
|---|---|
| Supported Formats | TEXT/PLAIN, .GRAPHQL → TEXT/PLAIN, .AVSC, .JSON |
| Execution Mode | 100% Client-Side In-Browser (client) |
| Browser Requirements | Modern browser with JavaScript enabled. |
| Performance Constraints | Runs client-side in browser memory. Performance and file limits are bounded by available local device RAM. |
100% Client-Side Privacy Guarantee
Your schema files remain strictly on your local device. Zero data is transmitted to external servers.
Frequently Asked Questions
How are nullable and mandatory GraphQL fields translated to Avro?
How are GraphQL list types mapped to Apache Avro?
Is my schema data private?
Methodology
This tool runs entirely in your browser. The example above shows a representative input and the result it produces.
Last updated .