Does it read arrays of tables?

Yes. Repeated [[users]] headers produce a JSON array of objects.

What happens to TOML dates?

They become JSON strings. The importer normalizes a date-time separator to T and a trailing lowercase z to Z.

Can I import Cargo.toml or pyproject.toml?

Yes. Open the file or paste its TOML content. The result represents its data; it does not convert package-manager conventions into a different ecosystem.

Can it preserve comments?

No. JSON has no comments. Use the original TOML file if you need its comments or layout.

TOML to JSON converter for configuration files

How to use this tool

Paste TOML or open a .toml file.
An opened .toml file converts straight away. For pasted TOML, choose TOML → JSON in the banner, then review the result.
Copy or download JSON for the receiving application.

Worked example

The server table becomes an object and the repeated users tables become an array of objects.

Input · example.toml

title = "API client"
retries = 3
[server]
host = "localhost"
enabled = true
[[users]]
name = "Ada"
[[users]]
name = "Lin"

Output

{
  "title": "API client",
  "retries": 3,
  "server": {
    "host": "localhost",
    "enabled": true
  },
  "users": [
    {
      "name": "Ada"
    },
    {
      "name": "Lin"
    }
  ]
}

Read TOML data as JSON

A [server] table becomes a server object. [[users]] headers become records in the users array. This is useful when inspecting a config or sending its data to a JSON API.

Converting a Cargo.toml or pyproject.toml file changes the format, not the meaning of its package or dependency settings. Review the destination schema before using the output.

Options and edge cases

TOML date and time values become JSON strings. They do not become executable date objects.
Integer digits are preserved, including hexadecimal, octal and binary integers converted to decimal notation. Consumers using JavaScript Number can still round large values.
TOML inf and nan become null because JSON has no non-finite number values.
Comments and table formatting disappear. Duplicate keys and invalid syntax produce an import error.

Private by default

Your document stays in this browser. Tool Kumar parses, converts and creates downloads on your device, with no account or upload step.

TOML to JSON questions

Does it read arrays of tables?: Yes. Repeated [[users]] headers produce a JSON array of objects.
What happens to TOML dates?: They become JSON strings. The importer normalizes a date-time separator to T and a trailing lowercase z to Z.
Can I import Cargo.toml or pyproject.toml?: Yes. Open the file or paste its TOML content. The result represents its data; it does not convert package-manager conventions into a different ecosystem.
Can it preserve comments?: No. JSON has no comments. Use the original TOML file if you need its comments or layout.