Try/Catch example.

example.ts

export class TryCatchExample {
  mtdExample() {
    try {
      for (editIndex = 0; editIndex < partner.objProjects.length; editIndex++)
      {
          if (partner.objProjects[editIndex].id == req.body.projectId) {found = true; break;}
      }
      
      if (!found)
      {
          return res.status(404).json({
              title: "Project not found",
              error: {message: "The passed ID does not match any project for this charity"}
          });
      }
  
      for (updateIndex = 0; updateIndex < partner.objProjects[editIndex].objUpdates.length; updateIndex++)
      {
          if (partner.objProjects[editIndex].objUpdates[updateIndex].id == req.body.updateId) {updateFound = true; break;}
      }
    } catch(e) {
      // We assume because it was the header set error.
      console.log("The header was already set.");
    } // try / catch
  }
}