Convert JSON to TOML
Convert a JSON config to a TOML config. 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 TOML
- 1. Paste your JSON. Paste the JSON config object you want converted. Top-level string, number and boolean fields become plain key-value lines, while nested objects become their own TOML sections.
- 2. Review the TOML output. There are no settings to adjust; the tool writes each nested object as a bracketed section header, matching the convention TOML files like Cargo.toml or pyproject.toml use for grouped settings.
- 3. Copy the TOML result. Copy the generated TOML and paste it into a config file that expects this format, such as a Rust Cargo.toml, a Python pyproject.toml, or a Hugo site config.
When to use Convert JSON to TOML
Convert JSON to TOML turns a JSON config object into TOML, the format Rust's Cargo, Python's Poetry and several static site generators use by convention. Nested objects become bracketed sections, matching how TOML groups related settings.
- Writing a starting Cargo.toml from JSON settings. You maintain project metadata as JSON in one part of your toolchain but need the equivalent settings in a Rust project's Cargo.toml, which only accepts TOML syntax.
- Migrating Python project config to pyproject.toml. A Python project is moving its configuration into pyproject.toml, and you have the existing settings modeled as JSON from an older setup.cfg-based tool.
- Porting a static site generator's config. A static site generator like Hugo reads its config as TOML, but you maintain the same settings as JSON elsewhere for use in other build scripts.
- Comparing JSON and TOML representations of the same config. You want to see how a nested JSON config maps onto TOML's section-based syntax before deciding which format to standardize on for a project.
Examples
Convert a config object
Input
{"title": "demo", "db": {"host": "localhost", "port": 5432}}Output
title = "demo" [db] host = "localhost" port = 5432
About the Convert JSON to TOML tool
Convert JSON to TOML does its work locally, right in the browser. Convert a JSON config to a TOML config. 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.
There is nothing to configure. Provide the input and the result appears on its own. 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
Does Convert JSON to TOML 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 use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.