How to Convert TOML to JSON

What this TOML to JSON converter does

TOML is often used for configuration, while JSON is useful when another tool or process expects JSON data. This converter changes TOML configuration text into a JSON representation without requiring you to rewrite each section manually. It supports scalar values such as strings, numbers, and booleans, as well as nested table structures. TOML dates, times, and datetimes appear as ISO-formatted strings. You can also choose the indentation used to display the result and optionally sort its keys. These controls are useful when you want the converted data to be easier to read, compare, or pass into a JSON-based task. Before converting a nonempty document, review its syntax so that table declarations, assignments, and values are written as valid TOML. The tool can also be run with no text, which has a defined empty-input result rather than representing a missing conversion. Treat the displayed JSON as a representation of the supplied configuration, and check important sections against the original text before relying on it elsewhere.

Step-by-step instructions

1. Prepare the TOML configuration text you want to convert. Check table headers, assignments, quoted strings, numbers, booleans, and nested sections for valid TOML syntax before entering them.

2. Enter the text in the converter input area. The input is optional, so you may leave it empty when you want to observe the empty-input behavior instead of converting a configuration.

3. Choose the numeric indentation setting for the JSON representation. The default is 2, but another setting can give the displayed result a layout that better suits your reading or formatting needs.

4. Decide whether to enable key sorting. Sorting is disabled by default; turn it on when a sorted presentation helps you inspect or compare the represented keys.

5. Start the conversion and inspect the JSON result. Confirm that the main sections and nested values correspond to the source. If the operation is unsuccessful, check the TOML syntax first. A failure can also occur during JSON serialization when a value cannot be serialized successfully, so revising syntax alone may not resolve every unsuccessful conversion.

How to read the result

A successful result is a JSON representation of the TOML data, with nested tables shown as nested JSON data and scalar values represented by their corresponding JSON forms. The indentation choice changes the visual layout of that representation, so extra spacing does not indicate a change to the configuration itself. Enabling key sorting changes how keys are ordered in the displayed representation, which can make inspection more consistent. Date, time, and datetime values should be read as ISO-formatted strings rather than as a separate JSON date type. For a nonempty configuration, compare top-level sections, child tables, and important scalar values with the source text. An empty or whitespace-only submission is a successful special case that produces an empty JSON object representation. An unsuccessful conversion means that no converted JSON representation was produced. In that situation, inspect the submitted TOML carefully and consider whether serialization of a value may have failed. The conversion result should therefore be checked for both structure and expected values before it is used in another application.

Worked example

You need to turn a small server configuration containing a port, an enabled flag, and a datetime into readable JSON for a task that expects nested settings.

Enter a short TOML configuration with a server table, set indentation to 4, enable key sorting, and start the conversion once the text has been checked for valid syntax. Then inspect the nested object and datetime string in the result shape described above without judging the data by spacing alone.

The result has a JSON object with a nested "server" object containing "port" and "enabled" values, plus an ISO-formatted string for the datetime value. The selected indentation affects the displayed spacing, and key sorting is enabled for the representation.

Limitations

• Malformed TOML prevents a converted representation, and JSON serialization may also fail for a value that cannot be serialized successfully.

Common errors

• A malformed table declaration, assignment, or value can make the conversion unsuccessful; correct the TOML syntax and submit the revised text again.

FAQ

What happens if I leave the TOML input empty?

Leaving the field empty, or entering only whitespace, is a successful case. The result is an empty JSON object representation rather than a conversion error. This behavior is separate from submitting malformed nonempty TOML.

Can I change JSON indentation?

The default numeric indentation setting is 2. You can select another numeric value when the displayed JSON needs a different amount of spacing for reading or formatting. The choice affects presentation rather than the represented configuration structure.

What if my TOML has a syntax error?

Malformed TOML causes an unsuccessful conversion and does not produce a converted JSON representation. Review table declarations, assignments, and values for valid syntax, then submit the corrected text. Serialization can also have its own failure boundary for values that cannot be serialized.