diff --git a/lib/index.js b/lib/index.js
index 1b78caa..1e3c5a6 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -80,7 +80,11 @@ function render(tree, options) {
 
     for (const key in object) {
       if (typeof object[key] === 'string') {
-        if (quoteAllAttributes || object[key].match(ATTRIBUTE_QUOTES_REQUIRED)) {
+        let isJson = false;
+        try { JSON.parse(object[key]); isJson = true; } catch (e) { }
+        if (isJson) {
+          attr += ' ' + key + "='" + object[key] + "'";
+        } else if (quoteAllAttributes || object[key].match(ATTRIBUTE_QUOTES_REQUIRED)) {
           let attrValue = object[key];
 
           if (replaceQuote) {