Singular routes

GET /profile
POST /profile
PUT /profile
PATCH /profile

Plural routes

Filter

Use . to access deep properties
GET /posts?title=json-server&author=typicode
GET /posts?id=1&id=2
GET /comments?author.name=typicode

Paginate

Use _page and optionally _limit to paginate returned data.
In the Link header you'll get first, prev, next and last links.

Sort

Add _sort and _order (ascending order by default)
GET /posts?_sort=views&_order=asc
GET /posts/1/comments?_sort=votes&_order=asc
For multiple fields, use the following format:
GET /posts?_sort=user,views&_order=desc,asc

Slice

Add _start and _end or _limit (an X-Total-Count header is included in the response)
GET /posts?_start=20&_end=30
GET /posts/1/comments?_start=20&_end=30
GET /posts/1/comments?_start=20&_limit=10
Works exactly as Array.slice (i.e. _start is inclusive and _end exclusive)

Operators

Add _gte or _lte for getting a range
GET /posts?views_gte=10&views_lte=20
Add _ne to exclude a value
GET /posts?id_ne=1
Add _like to filter (RegExp supported)
GET /posts?title_like=server

Full-text search

Add q
GET /posts?q=internet
Add _ne to exclude a value

Relationships

To include children resources, add _embed
GET /posts?_embed=comments
GET /posts/1?_embed=comments
To include parent resource, add _expand
GET /comments?_expand=post
GET /comments/1?_expand=post
To get or create nested resources (by default one level, add custom routes for more)
GET /posts/1/comments
POST /posts/1/comments

Github Link

For Full Details checkout github Page Arm64v8 JSON Server.