Convert JSON to MessagePack
Serialize JSON data to the binary MessagePack 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 MessagePack
- 1. Paste your JSON. Paste the JSON object or array you want serialized to MessagePack, a binary format designed to represent the same data as JSON in fewer bytes.
- 2. Review how the encoding works. There are no settings to configure: the tool maps each JSON value to its compact MessagePack representation, packing small integers and short strings into fewer bytes than their text equivalents.
- 3. Download the MessagePack file. Download the produced binary file from the output panel and use it wherever MessagePack is expected, such as a Redis cache value, a game networking protocol, or an RPC message.
When to use Convert JSON to MessagePack
Convert JSON to MessagePack serializes a JSON document into MessagePack, a binary format used across many languages for compact, fast data interchange. It represents the same values as JSON, but typically in fewer bytes and with faster parsing.
- Testing a MessagePack decoder you are building. You are implementing a MessagePack parser in a new language or environment and need known-correct binary output generated from a specific JSON document to test against.
- Preparing a compact cache value for Redis. You want to store a value in Redis using MessagePack instead of JSON text to save memory, and need a sample encoded file to verify your application's encoding logic.
- Building fixtures for an RPC protocol using MessagePack. A service uses MessagePack-RPC or a similar protocol for its messages, and you want reference binary payloads generated from known JSON to test client and server code.
- Comparing MessagePack's size against JSON for a given payload. You want to see how much smaller a specific JSON document becomes once encoded as MessagePack before deciding whether the switch is worth it.
Examples
Serialize an object to MessagePack
Input
{"name": "Ada", "age": 36}Output
data.msgpack: a 15 B binary file (download from the output panel)
About the Convert JSON to MessagePack tool
Convert JSON to MessagePack is a free online tool that works entirely inside your web browser. Serialize JSON data to the binary MessagePack format. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 90 JSON utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
There is nothing to configure. Provide the input and the result appears on its own. 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.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Does Convert JSON to MessagePack cost anything?
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?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
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?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
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.