JSON.Lua json.encode return nil

Question

I'm new to LUA and tried learning coding this language with Garrys Mod.

I want to get the messages from the Garrys Mod chat and send them into a Discord channel with a webhook.

It works, but I tried expanding this project with embeded messages. I need JSON for this and used json.lua as a library.

But as soon as I send a message I retrieve the following error message:

attempt to index global 'json' (a nil value)

The code that causes the error is the following:

json.encode({ { 
        ["embeds"] = { 
            ["description"] = text, 
            ["author"] = { 
                ["name"] = ply:Nick()
            }, 
        }, 
    } }),

The complete code:

AddCSLuaFile()
json = require("json")

webhookURL = "https://discordapp.com/api/webhooks/XXX"
local DiscordWebhook = DiscordWebhook or {}

hook.Add( "PlayerSay", "SendMsg", function( ply, text )
    t_post = {
        content = json.encode({ { 
            ["embeds"] = { 
                ["description"] = text, 
                ["author"] = { 
                    ["name"] = ply:Nick()
                }, 
            }, 
        } }),
        username = "Log",
    } 
    http.Post(webhookURL, t_post)
end )

I hope somebody can help me

Then the global variable json should not be nil. Perhaps you wrote local json = require("json") in a different file? — lhf
– lhf, Commented Jul 17, 2018 at 19:20
I've updated this thread with the whole code. Hope this can help, because the error is still not fixed — Lesh
– Lesh, Commented Jul 17, 2018 at 21:13
@Lesh What if you try to load json to local using local json = require "json"? — val - disappointed in SE
– val - disappointed in SE, Commented Jul 18, 2018 at 15:52

Mischa · Accepted Answer · 2018-09-01 14:04:01Z

1

Garry's Mod does provide two functions to work with json.

They are:

util.TableToJSON( table table, boolean prettyPrint=false )

and

util.JSONToTable( string json )

There is no need to import json and if I recall correctly it isn't even possible.

For what you want to do you need to build your arguments as a table like this:

local arguments = {
["key"] = "Some value",
["42"] = "Not always the answer",
["deeper"] = {
  ["my_age"] = 22,
  ["my_name"] = getMyName()
},
["even more"] = from_some_variable

and then call

local args_as_json = util.TableToJSON(arguments)

Now you can pass args_as_json to your

http.Post( string url, table parameters, function onSuccess=nil, function onFailure=nil, table headers={} )

answered Sep 1, 2018 at 14:04

Mischa

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6 Comments

Lesh Over a year ago

Well, now I recieve an output message in Discord, but its not formated like a normal embedded message

Mischa Over a year ago

@Lesh Do you still need help with this?

Lesh Over a year ago

yes, I'm sorry for late response. So basically what I've done was creating a local argument with all my JSON Table. Then I've used util.TableToJSON but my http.Post only contains this http.Post(webhookURL, { content = act_msg, username = "Hook"} ). But the output isn't formated and will return this {"embeds":{"author":{"name":"Lesh"},"description":"test"}}

Mischa Over a year ago

@Lesh so you want to pretty print your json? right? util.TableToJSON has a second parameter, which you can set to true for this. You can also see more here: wiki.garrysmod.com/page/util/TableToJSON

Lesh Over a year ago

I'm sorry, I meant instead of a formated json code an Embed output like this

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