{"id":18351673,"url":"https://github.com/open-draft/logger","last_synced_at":"2026-01-22T19:43:17.122Z","repository":{"id":152794287,"uuid":"621559751","full_name":"open-draft/logger","owner":"open-draft","description":"Environment-agnostic, ESM-friendly logger for simple needs.","archived":false,"fork":false,"pushed_at":"2023-04-14T17:41:49.000Z","size":136,"stargazers_count":19,"open_issues_count":5,"forks_count":0,"subscribers_count":0,"default_branch":"main","last_synced_at":"2025-10-23T16:11:15.976Z","etag":null,"topics":["debug","info","log","logger","warn"],"latest_commit_sha":null,"homepage":"https://npm.im/@open-draft/logger","language":"TypeScript","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/open-draft.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","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":"2023-03-30T23:06:10.000Z","updated_at":"2025-08-22T01:10:21.000Z","dependencies_parsed_at":"2024-02-06T01:32:08.048Z","dependency_job_id":null,"html_url":"https://github.com/open-draft/logger","commit_stats":null,"previous_names":[],"tags_count":6,"template":false,"template_full_name":null,"purl":"pkg:github/open-draft/logger","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/open-draft%2Flogger","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/open-draft%2Flogger/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/open-draft%2Flogger/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/open-draft%2Flogger/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/open-draft","download_url":"https://codeload.github.com/open-draft/logger/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/open-draft%2Flogger/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":28669541,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-01-22T19:36:09.361Z","status":"ssl_error","status_checked_at":"2026-01-22T19:36:05.567Z","response_time":144,"last_error":"SSL_read: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"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":["debug","info","log","logger","warn"],"created_at":"2024-11-05T21:32:11.284Z","updated_at":"2026-01-22T19:43:17.096Z","avatar_url":"https://github.com/open-draft.png","language":"TypeScript","readme":"# Logger\n\nEnvironment-agnostic, ESM-friendly logger for simple needs.\n\n## Why does this exist?\n\nI've been using `debug` for quite some time but wanted to migrate my projects to better ESM support. Alas, `debug` doesn't ship as ESM so I went and wrote this little logger just for my needs. You will likely see it printing useful data in Mock Service Worker and beyond.\n\n## Installation\n\n```sh\nnpm install @open-draft/logger\n```\n\n## Usage\n\nThis package has the same API for both browser and Node.js and can run in those environments out of the box.\n\n```js\n// app.js\nimport { Logger } from '@open-draft/logger'\n\nconst logger = new Logger('parser')\n\nlogger.info('starting parsing...')\nlogger.warning('found legacy document format')\nlogger.success('parsed 120 documents!')\n```\n\nLogging is disabled by default. To enable logging, provide the `DEBUG` environment variable:\n\n```sh\nDEBUG=1 node ./app.js\n```\n\n\u003e You can also use `true` instead of `1`. You can also use a specific logger's name to enable [logger filtering](#logger-filtering).\n\n## API\n\n- Class: `Logger`\n  - [`new Logger(name)`](#new-loggername)\n  - [`logger.debug(message, ...positionals)`](#loggerdebugmessage-positionals)\n  - [`logger.info(message, ...positionals)`](#loggerinfomessage-positionals)\n  - [`logger.success(message, ...positionals)`](#loggersuccessmessage-positionals)\n  - [`logger.warning(message, ...positionals)`](#loggerwarningmessage-positionals)\n  - [`logger.error(message, ...positionals)`](#loggererrormessage-positionals)\n  - [`logger.extend(name)`](#loggerextendprefix)\n  - [`logger.only(callback)`](#loggeronlycallback)\n\n### `new Logger(name)`\n\n- `name` `string` the name of the logger.\n\nCreates a new instance of the logger. Each message printed by the logger will be prefixed with the given `name`. You can have multiple loggers with different names for different areas of your system.\n\n```js\nconst logger = new Logger('parser')\n```\n\n\u003e You can nest loggers via [`logger.extend()`](#loggerextendprefix).\n\n### `logger.debug(message, ...positionals)`\n\n- `message` `string`\n- `positionals` `unknown[]`\n\nPrints a debug message.\n\n```js\nlogger.debug('no duplicates found, skipping...')\n```\n\n```\n12:34:56:789 [parser] no duplicates found, skipping...\n```\n\n### `logger.info(message, ...positionals)`\n\n- `message` `string`\n- `positionals` `unknown[]`\n\nPrints an info message.\n\n```js\nlogger.info('new parse request')\n```\n\n```\n12:34:56:789 [parser] new parse request\n```\n\n### `logger.success(message, ...positionals)`\n\n- `message` `string`\n- `positionals` `unknown[]`\n\nPrints a success message.\n\n```js\nlogger.success('prased 123 documents!')\n```\n\n```\n12:34:56:789 ✔ [parser] prased 123 documents!\n```\n\n### `logger.warning(message, ...positionals)`\n\n- `message` `string`\n- `positionals` `unknown[]`\n\nPrints a warning. In Node.js, prints it to `process.stderr`.\n\n```js\nlogger.warning('found legacy document format')\n```\n\n```\n12:34:56:789 ⚠ [parser] found legacy document format\n```\n\n### `logger.error(message, ...positionals)`\n\n- `message` `string`\n- `positionals` `unknown[]`\n\nPrints an error. In Node.js, prints it to `process.stderr`.\n\n```js\nlogger.error('failed to parse document')\n```\n\n```\n12:34:56:789 ✖ [parser] failed to parse document\n```\n\n### `logger.extend(prefix)`\n\n- `prefix` `string` Additional prefix to append to the logger's name.\n\nCreates a new logger out of the current one.\n\n```js\nconst logger = new Logger('parser')\n\nfunction parseRequest(request) {\n  const requestLogger = logger.extend(`${request.method} ${request.url}`)\n  requestLogger.info('start parsing...')\n}\n```\n\n```\n12:34:56:789 [parser] [GET https://example.com] start parsing...\n```\n\n### `logger.only(callback)`\n\nExecutes a given callback only when the logging is activated. Useful for computing additional information for logs.\n\n```js\nlogger.only(() =\u003e {\n  const documentSize = getSizeBytes(document)\n  logger.debug(`document size: ${documentSize}`)\n})\n```\n\n\u003e You can nest `logger.*` methods in the callback to `logger.only()`.\n\n## Log levels\n\nYou can specify the log levels to print using the `LOG_LEVEL` environment variable.\n\nThere are the following log levels:\n\n- `debug`\n- `info`\n- `success`\n- `warning`\n- `error`\n\n\u003e Providing no log level will print all the messages.\n\nHere's an example of how to print only warnings:\n\n```js\n// app.js\nimport { Logger } from '@open-draft/logger'\n\nconst logger = new Logger('parser')\n\nlogger.info('some info')\nlogger.warning('some warning')\nlogger.error('some error')\n```\n\n```js\nLOG_LEVEL=warning node ./app.js\n```\n\n```\n12:34:56:789 ⚠ [parser] some warning\n```\n\n## Logger filtering\n\nYou can only print a specific logger by providing its name as the `DEBUG` environment variable.\n\n```js\n// app.js\nimport { Logger } from '@open-draft/logger'\n\nconst appLogger = new Logger('app')\nconst parserLogger = new Logger('parser')\n\nappLogger.info('starting app...')\nparserLogger.info('creating a new parser...')\n```\n\n```sh\nDEBUG=app node ./app.js\n```\n\n```\n12:34:56:789 [app] starting app...\n```\n","funding_links":[],"categories":["Packages"],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fopen-draft%2Flogger","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fopen-draft%2Flogger","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fopen-draft%2Flogger/lists"}