Apache Avro to GraphQL Schema Converter
Convert Apache Avro records, enums, arrays, and unions into GraphQL SDL type definitions in your browser.
At a glance
Apache Avro to GraphQL Schema Converter transforms Apache Avro (.avsc) schema records, enums, maps, and unions into valid GraphQL SDL definitions. It maps primitive types to GraphQL scalars, arrays to list types, enums to enum definitions, and optional fields to nullable GraphQL fields purely in client-side memory.
100% Client-Side In-Browser Avro to GraphQL Transpiler
Compile Apache Avro (.avsc) schemas, records, enums, maps, and unions directly into GraphQL SDL Types, Enums, Unions, and Scalars with zero server uploads.
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How Apache Avro Maps to GraphQL SDL
Apache Avro is a row-oriented data serialization system heavily used in event-driven microservices, Kafka pipelines, and data lakes. GraphQL SDL provides a strongly-typed API query language for web clients. This tool maps Avro structural semantics cleanly into standard GraphQL specifications:
| Avro Schema Element | GraphQL SDL Mapping | Behavior & Nullability Rules |
|---|---|---|
| int, long | Int! | Avro 32/64-bit integers map to GraphQL Int scalar (or custom Float / String). |
| float, double | Float! | Floating-point numeric values map to GraphQL Float scalar. |
| string, bytes, fixed | String! | Text and byte streams map to GraphQL String scalar. |
| boolean | Boolean! | Boolean true/false flag maps to GraphQL Boolean scalar. |
| array { items: T } | [T!]! | Lists map to non-null GraphQL list wrappers. |
| map { values: T } | [KeyValuePair!]! | Maps represent dynamic key-value pairs or JSON scalar. |
| enum | enum Name { ... } | Avro enum symbols map directly to GraphQL enum definition. |
| union ["null", T] | T (nullable) | Nullable unions omit the trailing exclamation mark (!) in GraphQL SDL. |
| union [TypeA, TypeB] | union Name = TypeA | TypeB | Multi-type record unions map directly to GraphQL union definitions. |
Why Use This Apache Avro to GraphQL Schema Converter?
How to Use Apache Avro to GraphQL Schema Converter
Paste Avro Schema
Paste your Apache Avro (.avsc) JSON schema or load one of the pre-configured templates.
Configure Options
Select your preferred long integer mapping, map representation, and list nullability rules.
Copy or Export SDL
Copy the generated GraphQL SDL directly to your clipboard or download as a .graphql file.
Apache Avro to GraphQL Schema example
Transforms Avro UserProfile record into a strongly-typed GraphQL Object Type with non-null ID and Name, and nullable Bio.
{
"type": "record",
"name": "UserProfile",
"fields": [
{ "name": "id", "type": "int" },
{ "name": "name", "type": "string" },
{ "name": "bio", "type": ["null", "string"] }
]
}
type UserProfile {
id: Int!
name: String!
bio: String
}
Technical Specifications & Engine Details
| Specification | Details |
|---|---|
| Supported Formats | TEXT/PLAIN, .AVSC, .JSON → TEXT/PLAIN, .GRAPHQL |
| 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 does this tool map Avro unions to GraphQL?
How are Avro long integers handled in GraphQL?
Are my schemas sent to any server?
Methodology
This tool runs entirely in your browser. The example above shows a representative input and the result it produces.
Last updated .