Set the data- attribute on the lightning-input-field <lightning-input-field data-field-name-id="AccountName" field-name="AccountName__c"> </lightning-input-field> Use the this.template.querySelector() to find the correct lightning-input-field let field = this.template.querySelector("lightning-input-field[data-field-name-id=AccountName]"); Print the value console.log(field.value); Set a new value to for the lightning-input-fiel d field.value="new value"; Ta Da 🙌