Quality Rules · Free Local Tool

Data Quality Rule Builder

Check CSV with rules such as Required, Type, Range, Regex, Unique Value, etc., and output column-by-column violation and rule JSON.

No uploadsMobile-friendlyTheme support

What is the Data Quality Rules Workbench?

Check CSV with rules such as Required, type, range, Regex, unique value, etc., and output column-by-column violation and rule JSON. ToolHub places the core computing entirely within the browser, allowing immediate use on both desktop and mobile devices, without the need to register an account or send content to the backend.

How to use this tool?

  1. Enter the data according to the field prompts and select the required processing method.
  2. Click "Process Now" to view the results, indicator summary and necessary error messages.
  3. After confirming that the content meets actual needs, you can copy the results or download them into files for further use.

Suitable use cases

Data import, ETL, list cleaning, operational reports and Data Contract pre-checking. All processing is completed in the current page, which is especially suitable for workflows that do not want to post internal data to remote services.

Interpretation of results and precautions

Rules can only reflect the set conditions and cannot automatically understand the complete business semantics. Tools will validate basic input formats and provide readable error messages, but production environments should still be reconfirmed against source specifications, business rules, or professional requirements.

Browser and device support

Data Quality Rule Builder supports current Chrome, Edge, Firefox, and Safari releases. Mobile and desktop layouts use the same validation rules documented on this page.

Frequently Asked Questions

Will the Data Quality Rules Workbench upload data to the server?
No. Tool functions are executed directly within the current browser tab, and input and generated results will not be uploaded or saved by ToolHub.
What usage scenarios is the Data Quality Rules Workbench suitable for?
Data import, ETL, list cleaning, operational reports and Data Contract pre-checking
Do I need to install software before using the Data Quality Rules Workbench?
No need. Use a desktop or mobile browser that supports modern JavaScript, and no account is required.
What are the limitations of this tool?
Rules can only reflect the set conditions and cannot automatically understand the complete business semantics.
Is manual inspection required after the results are generated?
Needed. Tools can assist with calculations, conversions, or formatting, but before going online, importing data, or making business decisions, the results should still be reviewed according to actual specifications.

Data Quality Rule Builder: inputs, output, and reproducible example

Use the free Data Quality Rule Builder online. Fast, private, mobile-friendly, and processed directly in your browser.

What this page actually processes

FieldControlDefault exampleValidation role
CSV delimiterText,CSV delimiter is read by the browser as a text value before the tool runs.
Quality rulesMultiline textid | required | unique email | required | regex:^[^@]+@[^@]+\.[^@]+$ age | type:number | min:18 | max:120 status | oneof:active,inactiveQuality rules is read by the browser as a multiline text value before the tool runs.
CSV dataMultiline textid,email,age,status 1,[email protected],28,active 2,bad-mail,16,pending 2,[email protected],42,inactiveCSV data is read by the browser as a multiline text value before the tool runs.

Reproduce the built-in example

Start with CSV delimiter = ,; Quality rules = id | required | unique email | required | regex:^[^@]+@[^@]+\.[^@]+$ age | type:number | min:18 | max:120 status | oneof:active,inactive; CSV data = id,email,age,status 1,[email protected],28,active 2,bad-mail,16,pending 2,[email protected],42,inactive, then run Data Quality Rule Builder. Change one input at a time so the effect on the result remains traceable.

After validating csv delimiter, quality rules, csv data, the page displays its result in the output workspace and enables the relevant copy or download action.

When to use it and how to interpret the result

Data import, ETL, list cleaning, operational reports and Data Contract pre-checking. All processing is completed in the current page, which is especially suitable for workflows that do not want to post internal data to remote services.

Limits and checks before use

Rules can only reflect the set conditions and cannot automatically understand the complete business semantics. Tools will validate basic input formats and provide readable error messages, but production environments should still be reconfirmed against source specifications, business rules, or professional requirements.

Page verification record

Controls inspected3 documented inputsResult pathValidate → process → review → copy/downloadLast content review2026-09-02