Around 50 people were evacuated from nearby buildings in Caledonian Road, Islington as a precaution by the emergency services.
A London Fire Brigade spokesperson said: “A fire engine from Islington arrived within four minutes and quickly put the pavement fire out.
“Around 50 people from nearby businesses were evacuated as a precaution and thankfully no one was injured.
“The fire is believed to have been caused by an electrical fault under the pavement.
“The Brigade goes to around 50 incidents involving electrical manhole covers every year in London.“