araq/packedjson

packedjson is an alternative Nim implementation for JSON. The JSON is essentially kept as a single string in order to save memory over a more traditional tree representation.

packedjson

packedjson is an alternative Nim implementation for JSON. The JSON is essentially kept as a single string in order to save memory over a more traditional tree representation.

The API is mostly compatible with the stdlib's json.nim module, some features have been cut though.

To compile the benchmark, run these commands:

nim c -r bench\generator

nim c -r -d:release bench\benchmark.nim
nim c -r -d:release -d:useStdlib benchmark.nim

On my machine, I got these results:

packed json:  used Mem: 94.06MiB time: 2.622s
stdlib json:  used Mem: 1.277GiB time: 3.759s

packedjson is now being used in production and seems to be reasonably stable.

packedjson's Issues

Please create new release and version that includes the deserialiser.

So that you can easily use it via nimble.

`{}=` proc result is inconsistent with stdlib.json

import packedjson
var cost = newJObject()
var rows = [["AWS","compute"],["AWS","network"],["Alibaba","compute"],["Alibaba","network"]]

for row in rows:
    cost{row[0],row[1]} = %(cost{row[0],row[1]}.getFloat + 1.0)
echo cost

change packedjson to json to see the expected result.

Could you create a release?

The only reason I ask is that Nimble requires released to do versioning.

requires "packedjson >= 0.1.0"

the result of 'parseInt(cast[string](n.t[]), result, start)' not equal L

When using the getInt() method, I often encounter the following problems, even if the value I'm passing is an int.

/root/.nimble/pkgs/packedjson-0.1.0/packedjson.nim(565, 12) parseInt(cast[string](n.t[]), result, start) == L

Cannot import packedjson

Hi, I am newbie want to use packedjson from the nimble directory.

Downloading https://github.com/Araq/packedjson using git
Verifying dependencies for [email protected]
Installing [email protected]
Prompt: [email protected] already exists. Overwrite? [y/N]
Answer: Success: packedjson installed successfully.

but when I import on the .nim file, there is error said that cannot open packedjson
import packedjson <- error cannot open file packedjson

what I am missing to use and make packed json work?

Thanks,

Error building a new JObject

Im trying to use swap json out with packedJson but am stuck with an error that makes no sense to me.

This is my function

func `%`*(t : StringTableRef): JsonNode =
  let o = newJObject()
  if t == nil: return
  for i,v in t: o[i] = newJString(v)

which compiles fine under stdlib but with packedJson I get the following..

whip.nim(24, 18) Error: type mismatch: got <JsonTree, string, JsonNode>
but expected one of:
proc `[]=`(obj: var JsonTree; key: string; val: JsonNode)
...