Parse and create JSON data.
✍️ 3 exercises + code challenge in this lessonJSON (JavaScript Object Notation) is a text format for exchanging data, used by almost every web API.
JSON.parse(text): convert a JSON string into a JavaScript value.JSON.stringify(value): convert a value into a JSON string.JSON.stringify(value, null, 2): pretty-print with 2-space indentation.undefined and comments are not allowed.Mastering JavaScript JSON helps you write clean and reliable JavaScript code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<pre id="out"></pre>
<script>
const log = (...a) => document.getElementById("out").textContent += a.join(" ") + "\n";
const text = '{"name":"Sara","skills":["HTML","CSS"],"active":true}';
const user = JSON.parse(text);
log(user.name, "knows", user.skills.length, "skills");
user.skills.push("JavaScript");
log(JSON.stringify(user));
log(JSON.stringify(user, null, 2));
</script>Check what you learned in “JavaScript JSON”.
Convert a JSON string into an object.
const obj = JSON.(text);
Which method turns an object into a JSON string?
Parse the JSON text and log the city.
Free sign-in required · Google login available
Stuck on something?
Ask the community in the CodesInTech forum.
Need a developer?
Learning on your own is great — and when you need professional help, our team builds custom software, websites and mobile apps for clients worldwide.
Explore Our Services