I am building https://mockadillo.com https://mockadillo.com. So many times I have had to write mock servers and have to have friction with colleagues when they'

I am building https://mockadillo.com https://mockadillo.com. So many times I have had to write mock servers and have to have friction with colleagues when they're lagging behind (or when I am lagging behind) on development of dependent features. It's now a 5 second thing to bring up a mock of the response and keep working decoupled from annoyances.