files/en-us/web/api/deprecationreportbody/columnnumber/index.md
{{APIRef("Reporting API")}}{{AvailableInWorkers}}{{SeeCompatTable}}
The columnNumber read-only property of the {{domxref("DeprecationReportBody")}} interface returns the line in the source file in which the deprecated feature was used.
[!NOTE] This property is most useful alongside {{domxref("DeprecationReportBody.sourceFile")}} and {{domxref("DeprecationReportBody.lineNumber")}} as it enables the location of the column in that file and line where the error occurred.
An integer, or null if the column is not known.
In this example we create a new {{domxref("ReportingObserver")}} to observe deprecation reports, then print the value of columnNumber to the console.
let options = {
types: ["deprecation"],
buffered: true,
};
let observer = new ReportingObserver((reports, observer) => {
let firstReport = reports[0];
console.log(firstReport.type); // deprecation
console.log(firstReport.body.sourceFile); // the source file
console.log(firstReport.body.lineNumber); // the line in that file
console.log(firstReport.body.columnNumber); // the column in that file.
}, options);
{{Specifications}}
{{Compat}}