LunarVim.LunarVim/ftplugin/json.lua

-- npm install -g vscode-json-languageserver
require'lspconfig'.jsonls.setup {
    cmd = {
        "node", DATA_PATH ..
            "/lspinstall/json/vscode-json/json-language-features/server/dist/node/jsonServerMain.js",
        "--stdio"
    },
    on_attach = require'lsp'.common_on_attach,

    commands = {
        Format = {
            function()
                vim.lsp.buf.range_formatting({}, {0, 0}, {vim.fn.line("$"), 0})
            end
        }
    }
}

if O.lang.json.autoformat then
    require('lv-utils').define_augroups({
        _json_format = {
            {
                'BufWritePre', '*.json',
                'lua vim.lsp.buf.formatting_sync(nil, 1000)'
            }
        }
    })
end