They demanded the immediate release of Kanojia, Anuj Shukla, who is the editor of Noida-based TV channel Nation Live, and its head Ishika Singh, who have faced police action over release of alleged objectionable content against UP chief minister Yogi Adityanath.
The journalists, many wearing black arm bands and holding placards, held a symbolic march from the Press Club of India in central Delhi towards the Rail Bhawan circle and back in the scorching heat and raised slogans against the Yogi government.
Kanojia's wife Jageesha Arora, who also joined the protest, said, "My husband's arrest is absolutely illegal and unconstitutional. So, now, people can get arrested for writing something on social media and using humour."
The protest was held jointly by members of the Editors Guild of India, Press Club of India, Indian Women Press Corps, South Asian Women in the Media, Press Association and several other independent journalists and activists.
"Today, journalists can get arrested for using humour and irony in a social media post. This incident is a direct attack on freedom of expression," alleged Siddharth Varadarajan, founding editor of news portal The Wire.
"Kanojia had served for around two years at our organisation (The Wire) before moving on to a new job earlier this year," he added.
Senior journalist Neerja Chowdhury, who took part in the protest too, also alleged that the arrest of the three persons amounted to an attack on the freedom of expression.
Activist Shabnam Hashmi also demanded immediate dropping of the charges against Kanojia, Singh and Shukla and sought their release.
An FIR was registered against Kanojia at Hazratganj police station in Lucknow on Friday night in which it was alleged that the accused made "objectionable comments against the CM and tried to malign his image".
Kanojia had shared a video on Twitter and Facebook where a woman is seen speaking to reporters of various media organisations outside the CM's office, claiming that she had sent a marriage proposal to Adityanath.
Meanwhile, the Supreme Court on Monday agreed to hear on Tuesday a plea challenging the arrest of Kanojia.
A vacation bench comprising justices Indira Banerjee and Ajay Rastogi took note of the submission by a lawyer that the plea filed by the spouse of the arrested scribe needed urgent hearing as the arrest was "illegal" and "unconstitutional".
The journalist's wife has filed a habeas corpus (bring the person) petition, challenging the arrest of Kanojia.