TOML to JSON Converter

Convert TOML to formatted JSON online. Review tables, arrays and values, then copy or download the result; integer tokens remain exact and date/time values become ISO strings.

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Enter the inputs, then select Convert to JSON.

Your result

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Result will appear here

How TOML to JSON Converter works

The parser reads TOML tables and values, emits exact integer number tokens, and represents TOML date and time values as ISO strings in JSON.

The generated JSON represents the parsed data structure, rather than comments or original formatting. TOML nan and inf values are rejected because JSON cannot represent them.

Review duplicate assignments, table declarations, and value syntax in the original TOML when parsing fails.

TOML table structure connected to nested JSON data. — Illustration of the TOML to JSON Converter workflow.

How to use TOML to JSON Converter

Paste TOML source to produce JSON for review or a compatible downstream consumer.

Paste the complete TOML source

Enter the TOML tables, arrays, and values you want to convert. Keep quoted strings and table headers intact. Reduce excessive nesting and resolve unsupported nonfinite values before submitting.

Paste the complete TOML source

TOML to JSON Converter native input panel with the actual TOML settings used for this example. — Configure TOML; select Convert to JSON.

Convert to formatted JSON

Run the conversion and inspect the generated JSON structure. Table relationships and arrays come from the parsed source rather than from its original spacing or comments.

Convert to formatted JSON

TOML to JSON Converter actual result panel showing Ready. — Submitted result: Ready.

Copy or download and check types

Copy the JSON or download converted.json. Read the exact-integer and ISO-date-string note, then check the destination parser. JSON has no date type, and the receiving application can impose its own number limits.

Copy or download and check types

TOML to JSON Converter actual output and export region and result note after submitting the pictured settings. — Review the actual TOML to JSON Converter output and visible Copy result, Download converted.json controls. Read the result note.

When to use TOML to JSON Converter

Use conversion when the destination needs JSON rather than the original TOML representation.

Prepare an import file

Convert a TOML configuration when an import process specifically requests JSON. Check that the import expects the same key structure and value types. Changing the serialization format does not map one application configuration schema into another application schema.

Prepare an import file

Developer input and configuration represented by document cards. — Prepare the input. Concept illustration.

Review nested configuration

Inspect the JSON output when you want to see how TOML tables and arrays become nested data. Keep the source beside the result so a reader can relate the objects to their table declarations rather than guessing their origin.

Review nested configuration

A developer example flowing from input to reviewed output. — Inspect an example. Concept illustration.

Check a large numeric setting

Use a sample containing a long integer to inspect the emitted JSON token before integrating the conversion. Verify the receiving runtime preserves that value as needed. An exact token in the file does not guarantee exact arithmetic after another system parses it.

Check a large numeric setting

Developer output handed to the next stage of a workflow. — Use the result in your workflow. Concept illustration.

Read TOML dates and numbers in JSON

Check how the receiving application will interpret JSON numbers and strings after the TOML types are converted.

TOML date and time values become strings in JSON. The result therefore needs an explicit interpretation in the receiving application rather than an assumption that JSON carries a native date type.

NaN and infinity are rejected because they cannot be emitted as ordinary JSON numbers. Comments are not carried into the output as annotations or documentation.

Convert TOML to JSON Review the output

A developer result reviewed alongside its source. — Review the returned output. Concept illustration.

Check parsing and consumer limits

Review source assignments and table declarations before checking the converted document with its intended consumer.

Review duplicate assignments, table declarations, and value syntax in the original TOML when parsing fails. The input is limited to 100000 characters, and deeply nested data beyond the supported depth is rejected.

If an import succeeds but values change, check the receiving JSON number and date handling. Keep the TOML source as the authoritative editing copy when comments and formatting remain useful.

Convert TOML to JSON Check the source