A simple server that accepts JSON POSTs and allows querying the content with GET.
The server timestamps each JSON value it receives. Requests can specify results within a certain date/time range.
Every POST received is expected to contain a valid JSON value. Invalid JSON is rejected with a 400; valid JSON is accepted with a 201.
All POSTed values are saved indefinitely (as far as the server knows).
A simple naked '/' (just the host and port) will return "JSON Server" with some other fixed text telling how to form queries.
The query portion of a URL begins with '?'. There may later be query subdivisions, but for now there is no path portion of the URL.
Queries always return a JSON array as a UTF-8 string. If a query has no result, it returns "[]". If there is a query syntax error, an error object is returned:
{
"json-query-error": {
"query": "query as received",
"where": " ^ indicates position",
"what": "nature of error",
....
}
}
We will use this JSON value in query examples below:
{ "store": {
"name": "Borders",
"address": "761 Sunset Drive",
"city": "San Francisco",
"state": "CA",
"book": [
{ "category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{ "category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{ "category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{ "category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
}
NOTHING BELOW THIS IS IMPLEMENTED YET
For a simple example,
localhost:8081?json=store
will return all objects in the store that have an outer key "store". When json is the first query component, "json=" may be omitted.
localhost:8081?store.name:"Borders"
will return at least the JSON value above.
From now on we will omit the host:port part of the URL in example queries.
?store.book.author:author?select=author
The use of a name instead of a literal after : binds the name to the value. The above will return an array like:
["Nigel Rees","Eveln Waugh","Herman Melville","J. R. R. Tolkien"]
Dicey example:
?store?select=store.name:n,store.book.category?groupby=n
Vacuous array levels are omitted, so the result is:
[ "Borders", [ "reference", "fiction" ] ]
If there were two stores, however, the result would be:
[
[ "Borders", [ "reference", "fiction" ] ]
[ "Barnes & Noble", [ "reference", "fiction", "popup" ] ]
]
Valid query components are:
?json=query (json= may be omitted if first)
?select=names (comma-separated list of names, which are the "columns" of each row)
?from=datetime (starting datetime)
?to=datetime (ending datetime)
?date=datetime (this date, may be partially specified to indicate a range)
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