Convert JSON to Protobuf
Serialize JSON data to the binary Protobuf format. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Convert JSON to Protobuf
- 1. Paste your JSON. Paste the JSON object you want serialized to Protobuf, matching the fields your schema defines. Field values need to line up with the types the .proto schema declares for each name.
- 2. Provide the .proto schema and message type. Paste the schema text into .proto schema so the encoder knows each field's type and number, then enter the specific message name in Message type, such as Person, to encode against.
- 3. Download the Protobuf file. Download the produced binary file from the output panel and use it to test a gRPC service, a Protobuf-based storage format, or any system expecting this wire format.
When to use Convert JSON to Protobuf
Convert JSON to Protobuf serializes a JSON object into Protocol Buffers binary format using a .proto schema you supply, the same wire format gRPC services and many high-throughput systems use instead of JSON for compactness and speed.
- Testing a gRPC service with a known binary payload. You are debugging a gRPC client or server and want a reference Protobuf-encoded message generated from JSON input you can read and edit easily, based on the service's .proto schema.
- Building fixtures for a Protobuf-based storage format. A system stores records as serialized Protobuf messages, and you want to generate sample binary files from readable JSON to seed a test database.
- Verifying a schema encodes fields the way you expect. You wrote a new .proto schema and want to confirm a specific JSON input encodes to a reasonable byte size and structure before wiring it into real code.
- Producing test data for a Protobuf-based message queue. A message queue like Kafka carries Protobuf-encoded events, and you want a way to generate valid binary test messages from JSON without writing custom serialization code.
Examples
Serialize a Person message
Input
{"name": "Ada", "age": 36, "tags": ["math"]}Output
data.pb: a 16 B binary file (download from the output panel)
About the Convert JSON to Protobuf tool
Convert JSON to Protobuf does its work locally, right in the browser. Serialize JSON data to the binary Protobuf format. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the JSON Tools collection on EditSafely, a set of 90 small, focused JSON utilities that share the same instant, private workspace.
You can shape the output with 2 settings, including .proto schema and Message type, and the result refreshes the moment you change one. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Convert JSON to Protobuf free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.