How to read flat file?

Does anyone know any libraries to read data from flat file? I want to convert flat file data to json.

e.g customer_flat_file.txt

25654Gilberto Holms      gibaholms@hotmail.com         
12345William Miranda     blackstile@hotmail.com         
65987Billy Idol          billy@thehost.com             
25465Axel Rose           axl@thehost.com               
98653Sebastian Bach      sebastian@thehost.com         
15485Chuck Norris        norris@thehost.com            
43251Bob Marley          marley@thehost.com            
65821Bryan Adams         adams@thehost.com             
45842Britney Spears      spears@thehost.com