Convert config-style JSON into TOML
JSON to TOML is useful when a JSON object is really configuration data: package metadata, app settings, feature flags, or small environment profiles that would be easier to read as TOML. The converter parses valid JSON and writes TOML for shapes that fit TOML's config model.
TOML is not a universal replacement for JSON. It works best with a root object made of strings, numbers, booleans, arrays, and nested objects. Some JSON values, such as null or a top-level array, do not have a direct TOML representation.
JSON examples that usually map well to TOML
- Project metadata, package settings, and small build-tool configuration objects.
- OpenAI Codex config drafts with model, provider, sandbox, approval, and trusted-project settings.
- Feature flags where each flag is a boolean, string, number, or simple array.
- Environment profiles that can be grouped into clear TOML tables.
When JSON to TOML is a good fit
- Turning app settings from a JSON object into a readable TOML draft.
- Moving package, tool, or project metadata toward TOML-based config.
- Reviewing feature flags and environment profiles as nested TOML tables.
- Preparing a human-editable starting point before manual cleanup.
null values, and mixed data dumps may need manual restructuring before they can become valid TOML. Related converter
Need JSON from an existing TOML file? Use the TOML to JSON converter for config audits, scripts, and migration checks.
JSON to TOML FAQ
Can any JSON be converted to TOML?
No. TOML is a configuration format and works best with a root object. JSON top-level arrays, null, and some deeply mixed structures may need manual changes.
Can JSON comments be preserved?
No. Valid JSON has no comments, so there are no source comments to carry into the generated TOML.
What happens to nested JSON objects?
Nested objects usually become TOML tables. Review the output when arrays contain mixed shapes or nested objects that need a specific TOML table layout.