> For the complete documentation index, see [llms.txt](https://docs.impler.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.impler.io/validations/advanced.md). # Advanced Validations ## Validations #### Range Validates that field's values for `Number` and `Double` columns fall within a `min` and `max` values. Either `min`, `max` or `both` must be defined. Values are inclusive.

Name	Value	Is Required
`validate`	`range`	true
`min`		false
`max`		false
`errorMessage`		false

#### Length Validates that field's value for `String` column falls within `min` and `max` number of characters. Either `min`, `max` or `both` must be defined. Values are inclusive.

Name	Value	Is Required
`validate`	`length`	true
`min`		false
`max`		false
`errorMessage`		false

#### Unique Across Multiple Fields Validate uniqueness across multiple fields. To use it, place a `unique_with` validation on each field that you want to be part of the uniqueness validation, all sharing the same `uniqueKey`.

Name	Value	Is Required
`validate`	`unique_with`	true
`uniqueKey`		false
`errorMessage`		false

Here is an example set of fields using `unique_with` validations used to validate that the combination of `department code` and `employee Id` fields are unique.

[
  {
    "key": "Department Code",
    "name": "Department Code",
    "type": "String",
    "validations": [
      {
        "validate": "unique_with",
        "uniqueKey": "Employee No"
      }
    ]
  },
  {
    "key": "Employee Id",
    "name": "Employee Id",
    "type": "Number",
    "validations": [
      {
        "validate": "unique_with",
        "uniqueKey": "Employee No"
      }
    ]
  }
]

Here is the example of `unique_with` validation in action,

Checking uniqueness of Employee No using unique_with validation

## Adding Validations ### From Platform 1. Click on `Validations` while adding column or click on `Edit` to edit the column.

2. Assign validations as needed,

### From Code You can check the advanced validations sections in react( [React Embed](/importer/react-embed.md#advanced-validations)), angular [Angular Embed](/importer/angular-embed.md#advanced-validations)) and javascript ([HTML & JS Embed](/importer/html-js-embed.md#advanced-validations)) *** If you have any questions, suggestions, or comments. Feel free to reach out to us over [**Discord**](https://discord.impler.io). We’re constantly improving to deliver the best Data Importer for your product, and we value your input. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.impler.io/validations/advanced.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.