{"id":16965036,"url":"https://github.com/propensive/merino","last_synced_at":"2025-07-11T03:33:53.941Z","repository":{"id":80754935,"uuid":"450930896","full_name":"propensive/merino","owner":"propensive","description":"A JSON parser and AST","archived":false,"fork":false,"pushed_at":"2025-01-26T12:14:51.000Z","size":2526,"stargazers_count":4,"open_issues_count":3,"forks_count":0,"subscribers_count":2,"default_branch":"main","last_synced_at":"2025-07-04T22:48:36.758Z","etag":null,"topics":["fast-json-parser","json-parser","scala"],"latest_commit_sha":null,"homepage":"","language":"Scala","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/propensive.png","metadata":{"files":{"readme":".github/readme.md","changelog":null,"contributing":".github/contributing.md","funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2022-01-22T20:42:44.000Z","updated_at":"2025-01-26T12:14:54.000Z","dependencies_parsed_at":"2023-10-13T01:06:39.749Z","dependency_job_id":"419f163d-0800-4257-b235-473d4316d955","html_url":"https://github.com/propensive/merino","commit_stats":null,"previous_names":[],"tags_count":11,"template":false,"template_full_name":null,"purl":"pkg:github/propensive/merino","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/propensive%2Fmerino","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/propensive%2Fmerino/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/propensive%2Fmerino/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/propensive%2Fmerino/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/propensive","download_url":"https://codeload.github.com/propensive/merino/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/propensive%2Fmerino/sbom","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":264721615,"owners_count":23653968,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["fast-json-parser","json-parser","scala"],"created_at":"2024-10-13T23:44:52.727Z","updated_at":"2025-07-11T03:33:53.899Z","avatar_url":"https://github.com/propensive.png","language":"Scala","funding_links":[],"categories":[],"sub_categories":[],"readme":"[\u003cimg alt=\"GitHub Workflow\" src=\"https://img.shields.io/github/actions/workflow/status/propensive/merino\njawn/main.yml?style=for-the-badge\" height=\"24\"\u003e](https://github.com/propensive/merino\njawn/actions)\n[\u003cimg src=\"https://img.shields.io/discord/633198088311537684?color=8899f7\u0026label=DISCORD\u0026style=for-the-badge\" height=\"24\"\u003e](https://discord.com/invite/MBUrkTgMnA)\n\u003cimg src=\"/doc/images/github.png\" valign=\"middle\"\u003e\n\n# Merino\njawn\n\n__A fast JSON parser for Scala.__\n\n_Merino_ is a JSON parser, and nothing more. It provides just a single `parse`\nmethod that reads a stream of bytes and returns structured data.\n\n## Features\n\n- bare-bones JSON parsing\n- provides a single `parse` method\n- produces \"raw\" output, mostly as primitive types\n- optimized for performance\n\n\n## Availability\n\n\n\n\n\n\n\n## Getting Started\n\nMerino will parse a `DataStream`, that is, a `LazyList[IArray[Byte]]`. This\nmakes it easy to parse any type which can be converted to a byte array or a\nlazy stream.\n\nThe `JsonAst.parse` method will parse the input and return a `JsonAst`, which\nis an opaque type alias for the union of the following types:\n- `Long`, `Double` and `BigDecimal`, representing JSON number types,\n- `String` for JSON strings,\n- `Boolean` for JSON `true` and `false` values,\n- `Null` for the `null` value,\n- `IArray[Any]` representing a JSON array, and,\n- `(IArray[String], IArray[Any])` representing a JSON object\n\nNote that which type of `Long`, `Double` or `BigDecimal` the parser chooses to\nrepresent a given number will be determined by whether the type can represent\nthe number, as specified in the JSON source, precisely.\n\nThe types `IArray[Any]` and `(IArray[String], IArray[Any])`, representing\narrays and objects, will only ever contain `JsonAst`-typed values, despite\nhaving type parameters of `Any`. But type aliases cannot refer to themselves,\nso `Any` is used instead.\n\nAdditionally, the type `(IArray[String], IArray[Any])` was chosen as an\nalternative to `IArray[(String, Any)]` since the former requires `2n + 3`\nobjects to be constructed for each field in the JSON object, as opposed to\n`3n + 1` in the latter case: for anything but an object of exactly one key, the\nformer requires fewer objects to be created. Additionally, the types may be\ndisambiguated reflectively by their erased types.\n\nIf parsing fails, a `JsonParseError` will be thrown, including the line and\ncolumn in which the error occurs, and an enumeration value (of type\n`JsonParseError.Issue`) describing the error.\n\n\n\n\n\n\n## Status\n\nMerino\njawn is classified as __maturescent__. For reference, Soundness projects are\ncategorized into one of the following five stability levels:\n\n- _embryonic_: for experimental or demonstrative purposes only, without any guarantees of longevity\n- _fledgling_: of proven utility, seeking contributions, but liable to significant redesigns\n- _maturescent_: major design decisions broady settled, seeking probatory adoption and refinement\n- _dependable_: production-ready, subject to controlled ongoing maintenance and enhancement; tagged as version `1.0.0` or later\n- _adamantine_: proven, reliable and production-ready, with no further breaking changes ever anticipated\n\nProjects at any stability level, even _embryonic_ projects, can still be used,\nas long as caution is taken to avoid a mismatch between the project's stability\nlevel and the required stability and maintainability of your own project.\n\nMerino\njawn is designed to be _small_. Its entire source code currently consists\nof 825 lines of code.\n\n## Building\n\nMerino\njawn will ultimately be built by Fury, when it is published. In the\nmeantime, two possibilities are offered, however they are acknowledged to be\nfragile, inadequately tested, and unsuitable for anything more than\nexperimentation. They are provided only for the necessity of providing _some_\nanswer to the question, \"how can I try Merino\njawn?\".\n\n1. *Copy the sources into your own project*\n   \n   Read the `fury` file in the repository root to understand Merino\njawn's build\n   structure, dependencies and source location; the file format should be short\n   and quite intuitive. Copy the sources into a source directory in your own\n   project, then repeat (recursively) for each of the dependencies.\n\n   The sources are compiled against the latest nightly release of Scala 3.\n   There should be no problem to compile the project together with all of its\n   dependencies in a single compilation.\n\n2. *Build with [Wrath](https://github.com/propensive/wrath/)*\n\n   Wrath is a bootstrapping script for building Merino\njawn and other projects in\n   the absence of a fully-featured build tool. It is designed to read the `fury`\n   file in the project directory, and produce a collection of JAR files which can\n   be added to a classpath, by compiling the project and all of its dependencies,\n   including the Scala compiler itself.\n   \n   Download the latest version of\n   [`wrath`](https://github.com/propensive/wrath/releases/latest), make it\n   executable, and add it to your path, for example by copying it to\n   `/usr/local/bin/`.\n\n   Clone this repository inside an empty directory, so that the build can\n   safely make clones of repositories it depends on as _peers_ of `merino\njawn`.\n   Run `wrath -F` in the repository root. This will download and compile the\n   latest version of Scala, as well as all of Merino\njawn's dependencies.\n\n   If the build was successful, the compiled JAR files can be found in the\n   `.wrath/dist` directory.\n\n## Contributing\n\nContributors to Merino\njawn are welcome and encouraged. New contributors may like\nto look for issues marked\n[beginner](https://github.com/propensive/merino\njawn/labels/beginner).\n\nWe suggest that all contributors read the [Contributing\nGuide](/contributing.md) to make the process of contributing to Merino\njawn\neasier.\n\nPlease __do not__ contact project maintainers privately with questions unless\nthere is a good reason to keep them private. While it can be tempting to\nrepsond to such questions, private answers cannot be shared with a wider\naudience, and it can result in duplication of effort.\n\n## Author\n\nMerino\njawn was designed and developed by Jon Pretty, and commercial support and\ntraining on all aspects of Scala 3 is available from [Propensive\nO\u0026Uuml;](https://propensive.com/).\n\n\n\n## Name\n\nMerino is named after the variety of sheep known for the quality of their fleeces, in keeping with the trend for\nJSON libraries to allude to the story of Jason and the Argonauts.\n\nIn general, Soundness project names are always chosen with some rationale,\nhowever it is usually frivolous. Each name is chosen for more for its\n_uniqueness_ and _intrigue_ than its concision or catchiness, and there is no\nbias towards names with positive or \"nice\" meanings—since many of the libraries\nperform some quite unpleasant tasks.\n\nNames should be English words, though many are obscure or archaic, and it\nshould be noted how willingly English adopts foreign words. Names are generally\nof Greek or Latin origin, and have often arrived in English via a romance\nlanguage.\n\n## Logo\n\nThe logo represents a ball of wool, potentially merino wool.\n\n## License\n\nMerino\njawn is copyright \u0026copy; 2025 Jon Pretty \u0026 Propensive O\u0026Uuml;, and\nis made available under the [Apache 2.0 License](/license.md).\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpropensive%2Fmerino","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpropensive%2Fmerino","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpropensive%2Fmerino/lists"}