There are two types of Job Seeker's Allowance. People who've got a recent full record of National Insurance contributions are eligible for Contribution-Based JSA. It's not means-tested. (A multi-millionaire, with a dozen mansions and several yachts could get it, as long as he was actively seeking work). Since you're over 25, you'd get £71.70 per week.
However Contribution-Based JSA only lasts for a maximum of 6 months. Thereafter you'd be eligible for Income-Based JSA but, importantly, that IS means-tested. If you qualified for the full amount (e.g.if you lived on your own and had no significant savings) you'd get exactly the same as before (£71.70 per week) but that is reduced if you've got savings of over £6000. Since a partner's income is also taken into account, anyone with a partner in full-time employment normally gets absolutely nothing in JSA (except that, if they stay 'signed on' their National Insurance contributions continue to be paid for them).
https://www.gov.uk/jobseekers-allowance/overview
The 'extras' that come with JSA, such as free health prescriptions and mortgage assistance aren't available to those on Contribution-Based JSA. They're only available to people in receipt of Income-Based JSA.
https://www.gov.uk/support-for-mortgage-interest/overview