> For the complete documentation index, see [llms.txt](https://racoon-js.gitbook.io/zh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://racoon-js.gitbook.io/zh/other-common-api/validate.md).

# validate

## 作用

校验被检测值是否符合格式要求。

要数据格式符合要求，则校验通过，返回原始数据，或者返回经过处理后的数据（***`default`***, ***`format`*** 方法可修改返回值）。

否则，校验不通过，会抛出校验错误`ValidateError`, 错误信息`meesage`字段指明了不通过的原因。可通过`error`方法自定义错误文案。

## 参数

* `[value]` ***(\*)***  - 被检测值，可不传，默认为`undefined`.

## 示例

```javascript
const schema = racoon.number().min(0);
try {
  schema.validate(2);
  // pass
} catch (error) {
  // fail
}
```


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