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A TOML v1.0.0 spec-compliant parser

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toml-v1 test

A TOML parser compatible with TOML version v1.0.0.

This package passes the TOML test suite, except for a few tests that fall into these categories:

  • Tests for 64-bit integers (JavaScript numbers only have 53 bits of precision)
  • Tests for detecting invalid UTF-8 (not applicable to JavaScript strings)

It has the additional ability to track the source locations of keys and values after parsing (see below).

Installation

npm install toml-v1

Requires Node.js v14.x.x or later.

Usage

import { parse } from 'toml-v1';

const data = parse('[foo]\nbar = 123');

assert(data.foo.bar === 123);

Parsing dates

TOML defines four types of dates:

This package defines these types as subclasses of Date. The OffsetDateTime subclass is functionally equivalent to Date, but its timezone information is not forgotten. The other classes contain incomplete date/time information, so some of their methods are disabled. For example, calling .getFullYear() on LocalTime will throw an error.

import { LocalTime } from 'toml-v1';

const localTime = new LocalTime('12:42:42');

assert(localTime.getHours() === 12);
assert(localTime.toString() === '12:42:42');

Source tracking

By using the SourceTracker, you can retrieve Source objects corresponding to each key and value in the TOML file.

import { parser, SourceTracker } from 'toml-v1';

const tracker = new SourceTracker();
const data = parse('[foo]\nbar = 123', 'example.toml', tracker);

const keySource = tracker.getKeySource(data.foo, 'bar');
const valueSource = tracker.getValueSource(data.foo, 'bar');

assert(keySource.start === 6);
assert(keySource.end === 9);
assert(valueSource.start === 12);
assert(valueSource.end === 15);

License

MIT

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A TOML v1.0.0 spec-compliant parser

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