Apache Avro to OpenAPI Converter

Convert Apache Avro records, enums, maps, and unions into OpenAPI 3.0 and 3.1 schemas in your browser.

At a glance

Apache Avro to OpenAPI Converter transforms Apache Avro (.avsc) schema records, enums, maps, and unions into OpenAPI 3.0 and 3.1 schemas. It translates scalar types to typed integer and string formats, arrays to schema items, and unions to nullable properties or oneOf blocks purely within client-side memory.

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100% Client-Side In-Browser Apache Avro to OpenAPI Transpiler

Compile Apache Avro (.avsc) schemas, records, enums, maps, and unions into OpenAPI 3.0 / 3.1 specifications with YAML & JSON export. Zero server uploads.

Pure In-Browser
Presets:
Valid Schema 0 chars
OpenAPI Compilation Options
OpenAPI 3 0 chars
0 schemas
OpenAPI Topology Summary:
Schemas 0
Properties 0
Enums 0
Unions/OneOf 0

Why Use This Apache Avro to OpenAPI Converter?

100% Client-Side Privacy: Your schema structures never leave your device or reach external servers.
Comprehensive Avro Support: Full support for records, primitives, enums, arrays, maps, and unions.
Dual OpenAPI 3.0 & 3.1 Support: Generates compliant specifications for OAS 3.0.3 and OAS 3.1.0.
Flexible YAML & JSON Formats: Instant toggling between standard YAML specification and JSON representation.
Documentation Retention: Preserves schema and field docstrings as OpenAPI description annotations.

How to Use Apache Avro to OpenAPI Converter

1

Paste Avro Schema

Paste your Apache Avro (.avsc JSON) schema into the editor or select a built-in preset.

2

Configure OpenAPI Options

Select your preferred OpenAPI version (3.0.3 or 3.1.0) and choose YAML or JSON output format.

3

Copy or Export Spec

Instantly copy the generated OpenAPI specification or download it as a .yaml or .json file.

Avro to OpenAPI example

Demonstrates converting an Apache Avro User record into a clean OpenAPI 3.0.3 schema specification.

Avro Schema (.avsc) Source 
{
  "type": "record",
  "name": "User",
  "fields": [
    { "name": "id", "type": "string" },
    { "name": "age", "type": "int" },
    { "name": "tags", "type": { "type": "array", "items": "string" } }
  ]
}
Generated OpenAPI YAML Processed 
openapi: 3.0.3
info:
  title: User API
  version: 1.0.0
paths: {}
components:
  schemas:
    User:
      type: object
      properties:
        id:
          type: string
        age:
          type: integer
          format: int32
        tags:
          type: array
          items:
            type: string

Technical Specifications & Engine Details

Technical specifications and engine details for Apache Avro to OpenAPI Converter
Specification Details
Supported Formats Text / Input → Rendered Result
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Requires modern web browser with ECMAScript 6+ and standard DOM Web APIs.
Performance Constraints Client browser memory limit (typically 1–2 GB RAM); processing speed depends on client hardware.
Maintained by Pragyan Pahadi

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 Avro primitive types mapped to OpenAPI?
Avro int maps to integer (format: int32), long maps to integer (format: int64), float maps to number (format: float), double maps to number (format: double), string to string, boolean to boolean, and bytes to string (format: byte).
How are Avro maps translated into OpenAPI?
Avro maps map string keys to values, so they translate into OpenAPI objects with additionalProperties set to the mapped value schema.
How are Avro unions represented?
Nullable two-type unions like ["null", "string"] map to the base type with nullable: true. Multi-type unions map to OpenAPI oneOf arrays.
Is any schema data uploaded to a remote server?
No. All schema parsing and OpenAPI generation execute client-side in your local browser sandbox.

Methodology

This tool runs entirely in your browser. The example above shows a representative input and the result it produces.

Last updated .

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