nvim-config11/lsp/jsonls.lua

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities.textDocument.completion.completionItem.snippetSupport = true

return {
    cmd = { "vscode-json-language-server", "--stdio" },
    filetypes = { "json", "jsonc" },
    root_markers = { "." },

    capabilities = capabilities,
    init_options = {
        provideFormatter = true
    },
    single_file_support = true,
    settings = {
        json = {
            schemas = require('schemastore').json.schemas(),
            validate = { enable = true },
        },
    },
}