@iarna/toml

Better TOML parsing and stringifying all in that familiar JSON interface.

![Coverage Status](https://coveralls.io/github/iarna/iarna-toml)

TOML 1.0.0-rc.1

$3

The most recent version as of 2019-04-21: 1.0.0-rc.1

$3

1.0.0-rc.1 parsers can load almost any TOML 0.4 and TOML 0.5 document, but
TOML 1.0.0-rc.1 docs are not always compatible with TOML 0.4 and TOML 0.5
parsers. If you're using this to generate TOML documents and you want an
older parser to be able to read them you may want to use the
latest TOML 0.5 version of this module.

$3

``js const TOML = require('@iarna/toml') const obj = TOML.parse([abc]
foo = 123
bar = [1,2,3]) /* obj = {abc: {foo: 123, bar: [1,2,3]}} */ const str = TOML.stringify(obj) /* str = [abc] foo = 123 bar = [ 1, 2, 3 ] */`

Visit the project github for more examples!

`Why @iarna/toml`

* Support for TOML 1.0.0-rc.1! * Highly correct! Careful adherence to spec. * See TOML-SPEC-SUPPORT for a comparison of which TOML features are supported by the various Node.js TOML parsers. * Speedy! See benchmarks at end. * BigInt support on Node 10! * 100% test coverage. * Small parser bundle (if you use@iarna/toml/parse-string). * No deps. * Detailed and easy to read error messages‼

`console > TOML.parse(src) Error: Unexpected character, expecting string, number, datetime, boolean, inline array or inline table at row 6, col 5, pos 87: 5: "abc\"" = { abc=123,def="abc" } 6> foo=sdkfj ^ 7:`

`TOML.parse(str) → Object (example)`

Also available with: require('@iarna/toml/parse-string')

Synchronously parse a TOML string and return an object.

`TOML.stringify(obj) → String (example)`

Also available with: require('@iarna/toml/stringify')

Serialize an object as TOML.

`[your-object].toJSON`

If an object TOML.stringify is serializing has a toJSONmethod then it will call it to transform the object before serializing it. This matches the behavior ofJSON.stringify.

The one exception to this is that toJSON is not called for Dateobjects becauseJSON represents dates as strings and TOML can represent them natively.

momentobjects are treated the same as nativeDate objects, in this respect.

`TOML.stringify.value(obj) -> String`

Also available with: require('@iarna/toml/stringify').value

Serialize a value as TOML would. This is a fragment and not a complete valid TOML document.

`Promises and Streaming`

The parser provides alternative async and streaming interfaces, for times that you're working with really absurdly big TOML files and don't want to tie-up the event loop while it parses.

`$3`

Also available with: require('@iarna/toml/parse-async')

opts.blocksize is the amount text to parser per pass through the event loop. Defaults to 40kb.

Asynchronously parse a TOML string and return a promise of the resulting object.

`$3`

Also available with: require('@iarna/toml/parse-stream')

Given a readable stream, parse it as it feeds us data. Return a promise of the resulting object.

`$3`

Also available with: require('@iarna/toml/parse-stream')

Returns a transform stream in object mode. When it completes, emit the resulting object. Only one object will ever be emitted.

`Lowlevel Interface (example) (example w/ parser debugging)`

You construct a parser object, per TOML file you want to process:

`js const TOMLParser = require('@iarna/toml/lib/toml-parser.js') const parser = new TOMLParser()`

Then you call the parsemethod for each chunk as you read them, or in a single call:

`js parser.parse(hello = 'world')`

And finally, you call the finishmethod to complete parsing and retrieve the resulting object.

`js const data = parser.finish()`

Both the parse method and finishmethod will throw if they find a problem with the string they were given. Error objects thrown from the parser havepos, line and col attributes. TOML.parseadds a visual summary of where in the source string there were issues usingparse-pretty-error and you can too:

`js const prettyError = require('./parse-pretty-error.js') const newErr = prettyError(err, sourceString)`

`What's Different`

Version 3 of this module supports TOML 1.0.0-rc.1. Please see the CHANGELOG for details on exactly whats changed.

`TOML we can't do`

* -nan is a valid TOML value and is converted into NaN. There is no way to produce-nan when stringifying. Stringification will produce positive nan. * Detecting and erroring on invalid utf8 documents: This is because Node's UTF8 processing converts invalid sequences into the placeholder character and does not have facilities for reporting these as errors instead. We _can_ detect the placeholder character, but it's valid to intentionally include them in documents, so erroring on them is not great. * On versions of Node < 10, very large Integer values will lose precision. On Node >=10, bigints are used. * Floating/local dates and times are still represented by JavaScript Date objects, which don't actually support these concepts. The objects returned have been modified so that you can determine what kind of thing they are (withisFloating, isDate, isTimeproperties) and that their ISO representation (viatoISOString) are representative of their TOML value. They will correctly round trip if you pass them toTOML.stringify. * Binary, hexadecimal and octal values are converted to ordinary integers and will be decimal if you stringify them.

`Changes`

I write a by hand, honest-to-god, CHANGELOG for this project. It's a description of what went into a release that you the consumer of the module could care about, not a list of git commits, so please check it out!

`Benchmarks`

You can run them yourself with:

`console $ npm run benchmark`

The results below are from my desktop using Node 13.13.0. The library versions tested were@iarna/toml@3.0.0, toml-j0.4@1.1.1, toml@3.0.0,@sgarciac/bombadil@2.3.0, @ltd/j-toml@0.5.107, and fast-toml@0.5.4. The speed value is megabytes-per-second that the parser can process of that document type. Bigger is better. The percentage after average results is the margin of error.

New here is fast-toml. fast-toml is very fast, for some datatypes, but it also is missing most error checking demanded by the spec. For 0.4, it is complete except for detail of multiline strings caught by the compliance tests. Its support for 0.5 is incomplete. Check out the spec compliance doc for details.

As this table is getting a little wide, with how npm and github display it, you can also view it seperately in the BENCHMARK document.

`Tests`

The test suite is maintained at 100% coverage: ![Coverage Status](https://coveralls.io/github/iarna/iarna-toml)

The spec was carefully hand converted into a series of test framework independent (and mostly language independent) assertions, as pairs of TOML and YAML files. You can find those files here: spec-test.

Further tests were written to increase coverage to 100%, these may be more implementation specific, but they can be found in coverage and coverage-error.

I've also written some quality assurance style tests, which don't contribute to coverage but do cover scenarios that could easily be problematic for some implementations can be found in: test/qa.js and test/qa-error.js.

All of the official example files from the TOML spec are run through this parser and compared to the official YAML files when available. These files are from the TOML spec as of: 357a4ba6 and specifically are:

* github.com/toml-lang/toml/tree/357a4ba6/examples * github.com/toml-lang/toml/tree/357a4ba6/tests

The stringifier is tested by round-tripping these same files, asserting thatTOML.parse(sourcefile)deepEqualTOML.parse(TOML.stringify(TOML.parse(sourcefile))`. This is done in
test/roundtrip-examples.js
There are also some tests written to complete coverage from stringification in:
test/stringify.js

Tests for the async and streaming interfaces are in test/async.js and test/stream.js respectively.

Tests for the parser's debugging mode live in test/devel.js.

And finally, many more stringification tests were borrowed from @othiym23's
toml-stream module. They were fetched as of
b6f1e26b572d49742d49fa6a6d11524d003441fa and live in
test/toml-stream.

Improvements to make

* In stringify:
* Any way to produce comments. As a JSON stand-in I'm not too worried
about this. That said, a document orientated fork is something I'd like
to look at eventually…
* Stringification could use some work on its error reporting. It reports
_what's_ wrong, but not where in your data structure it was.
* Further optimize the parser:
* There are some debugging assertions left in the main parser, these should be moved to a subclass.
* Make the whole debugging parser thing work as a mixin instead of as a superclass.

@iarna/toml

Better TOML parsing and stringifying all in that familiar JSON interface.

![Coverage Status](https://coveralls.io/github/iarna/iarna-toml)

TOML 1.0.0-rc.1

$3

The most recent version as of 2019-04-21: 1.0.0-rc.1

$3

Visit the project github for more examples!

`Why @iarna/toml`

`TOML.parse(str) → Object (example)`

Also available with: require('@iarna/toml/parse-string')

Synchronously parse a TOML string and return an object.

`TOML.stringify(obj) → String (example)`

Also available with: require('@iarna/toml/stringify')

Serialize an object as TOML.

`[your-object].toJSON`

If an object TOML.stringify is serializing has a toJSONmethod then it will call it to transform the object before serializing it. This matches the behavior ofJSON.stringify.

The one exception to this is that toJSON is not called for Dateobjects becauseJSON represents dates as strings and TOML can represent them natively.

momentobjects are treated the same as nativeDate objects, in this respect.

`TOML.stringify.value(obj) -> String`

Also available with: require('@iarna/toml/stringify').value

Serialize a value as TOML would. This is a fragment and not a complete valid TOML document.

`Promises and Streaming`

The parser provides alternative async and streaming interfaces, for times that you're working with really absurdly big TOML files and don't want to tie-up the event loop while it parses.

`$3`

Also available with: require('@iarna/toml/parse-async')

opts.blocksize is the amount text to parser per pass through the event loop. Defaults to 40kb.

Asynchronously parse a TOML string and return a promise of the resulting object.

`$3`

Also available with: require('@iarna/toml/parse-stream')

Given a readable stream, parse it as it feeds us data. Return a promise of the resulting object.

`$3`

Also available with: require('@iarna/toml/parse-stream')

Returns a transform stream in object mode. When it completes, emit the resulting object. Only one object will ever be emitted.

`Lowlevel Interface (example) (example w/ parser debugging)`

You construct a parser object, per TOML file you want to process:

`js const TOMLParser = require('@iarna/toml/lib/toml-parser.js') const parser = new TOMLParser()`

Then you call the parsemethod for each chunk as you read them, or in a single call:

`js parser.parse(hello = 'world')`

And finally, you call the finishmethod to complete parsing and retrieve the resulting object.

`js const data = parser.finish()`

`js const prettyError = require('./parse-pretty-error.js') const newErr = prettyError(err, sourceString)`

`What's Different`

Version 3 of this module supports TOML 1.0.0-rc.1. Please see the CHANGELOG for details on exactly whats changed.

`TOML we can't do`

`Changes`

`Benchmarks`

You can run them yourself with:

`console $ npm run benchmark`

As this table is getting a little wide, with how npm and github display it, you can also view it seperately in the BENCHMARK document.

`Tests`

The test suite is maintained at 100% coverage: ![Coverage Status](https://coveralls.io/github/iarna/iarna-toml)

Further tests were written to increase coverage to 100%, these may be more implementation specific, but they can be found in coverage and coverage-error.

* github.com/toml-lang/toml/tree/357a4ba6/examples * github.com/toml-lang/toml/tree/357a4ba6/tests

Tests for the async and streaming interfaces are in test/async.js and test/stream.js respectively.

Tests for the parser's debugging mode live in test/devel.js.

And finally, many more stringification tests were borrowed from @othiym23's
toml-stream module. They were fetched as of
b6f1e26b572d49742d49fa6a6d11524d003441fa and live in
test/toml-stream.

@tuzig/toml

@iarna/toml

TOML 1.0.0-rc.1

$3

$3

$3

Why @iarna/toml

TOML.parse(str) → Object (example)

TOML.stringify(obj) → String (example)

[your-object].toJSON

TOML.stringify.value(obj) -> String

Promises and Streaming

$3

$3

$3

Lowlevel Interface (example) (example w/ parser debugging)

What's Different

TOML we can't do

Changes

Benchmarks

Tests

Improvements to make

@tuzig/toml

@iarna/toml

TOML 1.0.0-rc.1

$3

$3

$3

Why @iarna/toml

TOML.parse(str) → Object (example)

TOML.stringify(obj) → String (example)

[your-object].toJSON

TOML.stringify.value(obj) -> String

Promises and Streaming

$3

$3

$3

Lowlevel Interface (example) (example w/ parser debugging)

What's Different

TOML we can't do

Changes

Benchmarks

Tests

Improvements to make

`Why @iarna/toml`

`TOML.parse(str) → Object (example)`

`TOML.stringify(obj) → String (example)`

`[your-object].toJSON`

`TOML.stringify.value(obj) -> String`

`Promises and Streaming`

`$3`

`$3`

`$3`

`Lowlevel Interface (example) (example w/ parser debugging)`

`What's Different`

`TOML we can't do`

`Changes`

`Benchmarks`

`Tests`

`Why @iarna/toml`

`TOML.parse(str) → Object (example)`

`TOML.stringify(obj) → String (example)`

`[your-object].toJSON`

`TOML.stringify.value(obj) -> String`

`Promises and Streaming`

`$3`

`$3`

`$3`

`Lowlevel Interface (example) (example w/ parser debugging)`

`What's Different`

`TOML we can't do`

`Changes`

`Benchmarks`

`Tests`