v0.2.4 🦎 [lizard] "flatjson"

[k33g]

Handling Json with TinyGo is not straight forward (but not impossible).
If your use case is very simple (a Json string without nested object or array) you can use:

• flatjson.StrToMap(flatJsonStr string) map[string]interface{}: get a flat json string (no nested obj) and return a map
• flatjson.MapToStr(jsonMap map[string]interface{}) string: get a flat json map and return a json string

Example:

package main

import (
    "github.com/bots-garden/capsule/capsulemodule/flatjson"
    hf "github.com/bots-garden/capsule/capsulemodule/hostfunctions"
    "strconv"
)

func main() {
    hf.SetHandleHttp(Handle)
}

func Handle(request hf.Request) (response hf.Response, errResp error) {

    jsonMap := flatjson.StrToMap(request.Body)

    author := jsonMap["author"].(string)
    age := jsonMap["age"].(int)
    weight := jsonMap["weight"].(float64)
    isHuman := jsonMap["human"].(bool)
    message := jsonMap["message"].(string)

    hf.Log("👋 " + message + " by " + author + " 😄")
    hf.Log("👋 age: " + strconv.Itoa(age))
    hf.Log("👋 weight: " + strconv.FormatFloat(weight, 'f', 6, 64))

    if isHuman {
        hf.Log("I'm not a 🤖")
    }

    headersResp := map[string]string{
        "Content-Type": "application/json; charset=utf-8",
    }

    responseMap := map[string]interface{}{
        "message": "👋 hey! What's up?",
        "author":  "Bob",
    }

    return hf.Response{Body: flatjson.MapToStr(responseMap), Headers: headersResp}, nil
}

Call the function:

curl -v -X POST \
  http://localhost:7070 \
  -H 'content-type: application/json; charset=utf-8' \
  -d '{"message": "TinyGo 💚💜 wasm", "author": "@k33g", "text":"this is a text", "age":42, "human": true, "weight": 100.5}'

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This discussion was created from the release v0.2.4 🦎 [lizard] "flatjson".