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Jsmn - a world fastest JSON parser - in pure Nim

Home Page: https://opensystemslab.github.io/jsmn.nim/

License: MIT License

Nim 100.00%

jsmn nim parser json fastest-json-parser

jsmn.nim's Introduction

jsmn.nim

Jsmn - a world fastest JSON parser - in pure Nim

According to this benchmark script with about 3MB JSON of World Bank dataset, JSMN is 2-2.5 times faster than marshal

Usage

import jsmn
const
  json = """{
    "user": "johndoe",
    "admin": false,
    "uid": 1000,
    "groups": ["users", "wheel", "audio", "video"]}"""

var tokens = newSeq[JsmnToken](32) # expect not more than 32 tokens
let r = parseJson(json, tokens)

for i in 1..r:
  var token = addr tokens[i]
  echo "Kind: ", token.kind
  echo "Value: ", json[token.start..<token.stop]

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varriount slangmgh refaqtor planetis-m

jsmn.nim's Issues

Screenshots are dead

P.S. also I like to read some realization details, why it is so fast.

Is this actually the world's fastest JSON parser?

Hello there, I've recently been looking at @OpenSystemLab's projects and couldn't help but wonder if the claim of being the fastest JSON parser in the world is a made up claim or not. Are there any benchmarks to back up the claims? I'm sorry if I sound offending or rude, I'm just curious.

Usage example doesn't compile

Error: type mismatch: got <string, array[0..31, JsmnToken]>
but expected one of:
proc parseJson(json: string; initialSize = JSMN_TOKENS; autoResize = false): seq[
JsmnToken]
first type mismatch at position: 2
required type for initialSize: int
but expression 'tokens' is of type: array[0..31, JsmnToken]
proc parseJson(json: string; tokens: var seq[JsmnToken]; autoResize = false): int
first type mismatch at position: 2
required type for tokens: var seq[JsmnToken]
but expression 'tokens' is of type: array[0..31, JsmnToken]

expression: parseJson(json, tokens)

Accept memory maps and streams

Memory maps for large JSON files would be nice to have, as well as support for some sort of streaming mechanism (for things like sockets).

Please clarify license contradiction

A source code comment says it's Apache-licensed, but the LICENSE and .nimble file say "MIT". I hope it's actually MIT licensed, and the Apache comments (which are unnecessary in any case) will be removed.

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