Problem to enconde table to json (string index expected, got number)

Question

I have the following table:

local my_table = {data = {{value1 = "test1", value2 = "test2"}, {value3 = "test3", value4 = "test4"}}}

I want to convert this table to json format and save to a file. But, when I tried

json.encode(my_table)

I got an error: bad argument #1 to 'encode' (["data"] => string index expected, got number)

I expect the json:

{
   "data":[
      {
         "value1":"test1",
         "value2":"test2"
      },
      {
         "value3":"test3",
         "value4":"test4"
      }
   ]
}

Which library do you use?

Luke100000
– Luke100000

2023-01-25 16:23:53 +00:00
Commented Jan 25, 2023 at 16:23 — Luke100000
– Luke100000, Commented Jan 25, 2023 at 16:23

ESkri · Accepted Answer · 2023-01-25 15:59:15Z

1

It works!

local json = require'json'
local my_table = {data = {{value1 = "test1", value2 = "test2"}, {value3 = "test3", value4 = "test4"}}}
print(json.encode(my_table))  -- {"data":[{"value1":"test1","value2":"test2"},{"value4":"test4","value3":"test3"}]}

I'm using this repo

Probably, the implementation you are using requires special syntax to treat Lua table as JSON array instead of JSON dictionary.
The implementation I'm using makes this decision (is it an array or a dictionary) automatically.

answered Jan 25, 2023 at 15:59

ESkri

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1 Comment

Mateus Mattos Over a year ago

You are right! I was using the lua-json that have this problem! Thank you Eskri.

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