Zod to Protobuf (Proto3) Converter

Convert Zod validation schemas into Protocol Buffers version 3 message definitions in your browser.

At a glance

Zod to Protobuf Converter transforms runtime Zod schemas into Protocol Buffers Proto3 definitions. It maps z.object into proto3 messages with sequential field tags, translates string, int32, double, and bool primitives, converts z.array to repeated fields, and exports valid .proto files client-side.

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Developer Suite: Zod to Proto Proto to Zod Zod to GraphQL Zod to OpenAPI Zod to JSON Schema Zod to TS

100% Client-Side In-Browser Zod to Protobuf (Proto3) Generator

Compile runtime Zod schemas into Protocol Buffers version 3 message definitions, repeated fields, enums, and sequential tags locally in browser memory. Zero network traffic or cloud uploads.

Pure In-Browser
Presets:
0 lines • 0 chars
Proto3 Generation Options
Valid Protocol Buffers Version 3 (Proto3)
0 lines • 0 chars

You May Also Need

Developer Type & Schema Suite
Proto to Zod

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Zod to OpenAPI

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Zod to JSON Schema

Convert Zod validation models into JSON Schema Draft-07 / 2020-12.

Why Use This Zod to Protobuf Converter?

100% Client-Side Conversion: All parsing and Proto3 formatting executes in your browser with zero server latency.
Deterministic Sequential Tagging: Automatically assigns 1-based sequential field indices (= 1, = 2) for strict Proto3 compliance.
Integer and Floating Point Detection: Maps z.number().int() to int32 (or int64) and regular z.number() to double.
Repeated and Optional Modifiers: Translates z.array() into repeated fields and .optional() into proto3 optional fields.
Enum Zero-Value Guard: Emits required UNSPECIFIED = 0 default values for all generated enums.

How to Use Zod to Protobuf Converter

1

Paste Zod Source Code

Enter or paste your Zod schema object definitions into the input editor.

2

Configure Proto3 Options

Specify an optional package name, choose between int32 or int64, and select timestamp handling.

3

Copy or Download .proto

Copy the generated Proto3 schema directly or download it as a .proto file ready for protoc compilation.

Zod Account Schema to Proto3 Message

Demonstrates compiling a Zod schema into a standard Proto3 message with snake_case field naming and sequential indices.

Zod Schema Input Source 
const accountSchema = z.object({
  id: z.string().uuid(),
  balance: z.number(),
  transactionCount: z.number().int(),
  tags: z.array(z.string()),
  isVerified: z.boolean(),
});
Proto3 Output Processed 
syntax = "proto3";

message Account {
  string id = 1;
  double balance = 2;
  int32 transaction_count = 3;
  repeated string tags = 4;
  bool is_verified = 5;
}

Technical Specifications & Engine Details

Technical specifications and engine details for Zod to Protobuf Converter
Specification Details
Supported Formats TEXT → TEXT
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Modern browser with JavaScript enabled.
Performance Constraints Zero external dependencies. Runs 100% client-side in browser memory.
Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

Your files and data remain strictly on your local device. Computations run locally using browser memory with zero network uploads.

Frequently Asked Questions

How are field numbers assigned in generated Proto3 messages?
Field tags are automatically numbered sequentially starting from 1 in order of declaration, ensuring valid Protocol Buffers binary wire compatibility.
How does the tool handle enum zero values?
Proto3 requires that the first enum value evaluates to 0. The converter automatically prepends a <NAME>_UNSPECIFIED = 0 value if zero is not explicitly defined.
Does this tool support optional fields?
Yes. When a field is marked with .optional(), the generator prefixes it with the Proto3 optional keyword, allowing field presence tracking.
Is my schema data private?
Yes. 100% of the lexical parsing and Proto3 formatting occurs locally in your browser sandbox. No source code or schemas are transmitted to external servers.

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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