Jack Coulson from Mexborough in England who had said in January he would kill the Jewish MP, Luciana Berger, had his phone examined by the police.
The investigation by Counter Terrorism Policing North East and South Yorkshire Police revealed Coulson had downloaded information on how to obtain and mix explosives and how to manufacture pipe bombs and other explosive devices.
The police uncovered a wide range of extreme right-wing material and propaganda, including racist and anti-Semitic imagery.
The court heard Mr. Coulson had threatened to 'put two bullets in the back of her head,' referring to Labour MP for Liverpool Wavertree, Luciana Berger.
Mr. Coulson's search history also indicated an interest in National Action, Nazism and White Jihad.
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"Jack Coulson was in possession of disturbing and potentially dangerous material, which indicated an extreme right wing mind set and an interest in home-made explosives. He hadn't come across this material by chance, but had actively searched for it and downloaded it. While no evidence was found to suggest Coulson was planning to act on this information, the combination of this material and his ideology is very concerning," Detective Superintendent Simon Atkinson, Head of Investigations at Counter Terrorism Policing North East, said in a statement.
The court was also told the young man was a member of National Action, a secretive far-right organization banned by the UK government in 2016.