Comp[any House api

I making company house API.
An input box gets a user name and shows a result this company name exists or not.
kindly help, me

I am sorry but Companies House are unable to help customers with their code.
How to use our API is documented https://developer.companieshouse.gov.uk/api/docs/
If this is beyond your skills, you may need to research general API usage and/or engage the services of an IT company.