{"id":21404778,"url":"https://github.com/fakundo/react-vld","last_synced_at":"2026-04-17T10:09:02.113Z","repository":{"id":14813157,"uuid":"77147033","full_name":"fakundo/react-vld","owner":"fakundo","description":"Simple and flexible validation for React and Preact components","archived":false,"fork":false,"pushed_at":"2022-12-10T16:47:15.000Z","size":1950,"stargazers_count":2,"open_issues_count":16,"forks_count":0,"subscribers_count":1,"default_branch":"master","last_synced_at":"2025-06-30T14:45:35.814Z","etag":null,"topics":["preact","react","validation"],"latest_commit_sha":null,"homepage":"","language":"JavaScript","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/fakundo.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2016-12-22T13:32:46.000Z","updated_at":"2021-04-09T12:55:33.000Z","dependencies_parsed_at":"2023-01-14T00:15:13.095Z","dependency_job_id":null,"html_url":"https://github.com/fakundo/react-vld","commit_stats":null,"previous_names":[],"tags_count":5,"template":false,"template_full_name":null,"purl":"pkg:github/fakundo/react-vld","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/fakundo%2Freact-vld","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/fakundo%2Freact-vld/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/fakundo%2Freact-vld/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/fakundo%2Freact-vld/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/fakundo","download_url":"https://codeload.github.com/fakundo/react-vld/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/fakundo%2Freact-vld/sbom","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":266519836,"owners_count":23942122,"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","status":"online","status_checked_at":"2025-07-22T02:00:09.085Z","response_time":66,"last_error":null,"robots_txt_status":null,"robots_txt_updated_at":null,"robots_txt_url":"https://github.com/robots.txt","online":true,"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":["preact","react","validation"],"created_at":"2024-11-22T16:18:02.303Z","updated_at":"2026-04-17T10:08:57.049Z","avatar_url":"https://github.com/fakundo.png","language":"JavaScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"# react-vld / preact-vld\n\n[![npm](https://img.shields.io/npm/v/react-vld.svg)](https://www.npmjs.com/package/react-vld)\n\nSimple and flexible validation for React and Preact components. \n\n- The main thing here is `Validator` component. Use it as a wrapper for your input components, forms, or whatever component you want to validate.\n\n- `Validator` accepts `children` prop as a function and passes the validation state as a parameter into it.\n\n- For updating validation state `Validator` uses a functional prop - `rule`. If a `ValidationError` was thrown within the `rule`, then validation fails, and the `Validator` updates validation state.\n\n- By default, `Validator` is rerendered every time the validation state is updated.\n\n- You can nest `Validator` components. The parent `Validator` fails when any of the child `Validator` fails.\n\n### Installation\n\nFor React\n```\nnpm i react-vld\n```\n\nFor Preact\n```\nnpm i preact-vld\n```\n\n### Usage\n\nExample of Input component\n\n```js\nimport { Validator, ValidationError } from 'react-vld' // or from 'preact-vld'\n\nexport default () =\u003e {\n  const [value, setValue] = useState('')\n\n  const checkValue = useCallback(() =\u003e {\n    if (value.trim() === '') {\n      throw new ValidationError('Required field')\n    }\n  }, [value])\n\n  const handleChange = useCallback((ev) =\u003e {\n    setValue(ev.target.value)\n  }, [])\n  \n  return (\n    \u003cValidator rule={checkValue}\u003e\n      { ({ validate, isInvalid, validationError }) =\u003e (\n        \u003cFragment\u003e\n          \u003cinput \n            value={value}\n            onBlur={validate}\n            onChange={handleChange}\n          /\u003e\n          { isInvalid \u0026\u0026 (\n            \u003cdiv\u003e\n              { validationError.message }\n            \u003c/div\u003e\n          ) }\n        \u003c/Fragment\u003e\n      ) }\n    \u003c/Validator\u003e\n  )\n}\n```\n\nExample of Form component (nesting)\n\n```js\nimport { Validator, ValidationError } from 'react-vld' // or from 'preact-vld'\n\nexport default () =\u003e (\n  \u003cValidator\u003e\n    { ({ validate }) =\u003e {\n      const handleSubmit = useCallback((ev) =\u003e {\n        ev.preventDefault()\n\n        if (validate().isValid) {\n          alert('Submitted!')\n        }\n      }, [validate])\n\n      return (\n        \u003cform onSubmit={handleSubmit}\u003e\n          \u003cInput /\u003e\n          \u003cbutton type=\"submit\" /\u003e\n        \u003c/form\u003e\n      )\n    } }\n  \u003c/Validator\u003e\n)\n```\n\n### API\n\n#### `Validator` props\n\n- `rule()` used to calculate new validation state\n\n- `mapError(validationError)` transforms validation error, may be useful for adding some payload to the error\n\n- `children(validationState)`\n\n#### `validationState` has the following structure\n\n- `validate({ updateComponent = true } = {})` invokes validation routine (calling `rule` and also calling `validate` for every child `Validator`)\n\n- `resetValidation({ updateComponent = true } = {})` resets validation state (also calling `resetValidation` for every child `Validator`)\n\n- `isValid` = `true|false|undefined`\n\n- `isInvalid` = `true|false|undefined`\n\n- `validationError` = `ValidationError|undefined`\n\n#### `ValidationError`\n\n- `constructor(message, payload)`\n\n### License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffakundo%2Freact-vld","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ffakundo%2Freact-vld","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffakundo%2Freact-vld/lists"}