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---
title: "InterventionReportBody: lineNumber property"
short-title: lineNumber
slug: Web/API/InterventionReportBody/lineNumber
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.InterventionReportBody.lineNumber
---
{{APIRef("Reporting API")}}{{SeeCompatTable}}
The **`lineNumber`** read-only property of the {{domxref("InterventionReportBody")}} interface returns the line in the source file in which the intervention occurred.
> **Note:** This property is most useful alongside {{domxref("InterventionReportBody.sourceFile")}} as it enables the location of the line in that file where the feature is used.
## Value
An integer, or `null` if the line is not known.
## Examples
In this example we create a new {{domxref("ReportingObserver")}} to observe intervention reports, then print the value of `lineNumber` to the console.
```js
const options = {
types: ["intervention"],
buffered: true,
};
const observer = new ReportingObserver((reports, observer) => {
const firstReport = reports[0];
console.log(firstReport.type); // intervention
console.log(firstReport.body.sourceFile); // the source file
console.log(firstReport.body.lineNumber); // the line in that file
}, options);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}