---
title: "How real-time error checking works"
slug: "how-real-time-error-checking-works"
updated: 2026-04-29T16:50:08Z
published: 2026-04-29T16:50:08Z
canonical: "help.quickbase.com/how-real-time-error-checking-works"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.quickbase.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How real-time error checking works

As you enter information in your formula, real-time error checking quickly fixes or flags formatting and syntax errors and checks formula argument types.

If Quickbase detects an error, a warning icon will appear. ![Warning icon indicating a formula error](https://cdn.document360.io/dd260e4e-10bb-4b66-8fb3-5504c272b904/Images/Documentation/22290522675860.png?sv=2026-02-06&spr=https&st=2026-11-04T08%3A17%3A32Z&se=2026-11-04T09%3A17%3A32Z&sr=c&sp=r&sig=Hq3Mkjb8FgQQzkf3a9mExUzNuCWI6Is1Gbi1jb3bYCc%3D) Select the icon to view specific error messages.

## Automatic error checking

After you save your formula, the software checks formula syntax, ensures fields and references are valid, and evaluates the formula to make sure no other errors exist.

### Formula syntax check

Quickbase checks the formula syntax, such as parentheses placement.

When the cursor is to the right of an opening or closing parenthesis, a gray frame highlights the matching parenthesis, if there is one.

![Gray frame highlighting a matching parenthesis in the formula editor](https://cdn.document360.io/dd260e4e-10bb-4b66-8fb3-5504c272b904/Images/Documentation/18207555103380.png?sv=2026-02-06&spr=https&st=2026-11-04T08%3A17%3A32Z&se=2026-11-04T09%3A17%3A32Z&sr=c&sp=r&sig=Hq3Mkjb8FgQQzkf3a9mExUzNuCWI6Is1Gbi1jb3bYCc%3D)

### Formula validation

Formula validation occurs once the formula's syntax is correct. Quickbase makes sure that

- Field references refer to fields in the app
- Formula data types and field references match those required by functions and operators

### Formula evaluation

After a formula is validated, Quickbase processes the formula and produces the result.

Some errors don't show up until evaluation. For example, if a formula refers to a deleted field the result of the evaluation is [null](/v1/docs/best-practices-writing-formulas).

Formulas are evaluated many times to ensure they work. For example, formulas are evaluated when displaying a record that contains formulas or sorting a table on a formula field.