Lua: get POST data

Question

I'm receiving this JSON in the POST data:

{
    "foo":{
        "hi": "there",
        "hello": "world"
    }
}

In Lua, I want to get foo in order to save it in Redis, so it'd be great to save it as an string.

How can I get it?

Answer 1

You'll need to install json-lua or lua-cjson packages first. Then, parse the JSON response (received as string) and it gets converted to a table.

Using pairs() you can iterate over key-values of the table generated above.

---

OpenResty already bundles a fork of lua-cjson with it.

Answer 2

If the string is s, then this extracts the value of foo:

print(s:match('"foo"%s*:%s*(%b{})'))