In this article
If you have ever opened an online store’s settings, connected two services or exported data from a platform, you have probably seen text full of curly braces and quotation marks. That is JSON, today’s common language for exchanging data between applications.
What is JSON?
JSON stands for JavaScript Object Notation. It is a lightweight text format for representing data in a way that is easy for humans to read and for computers to parse. Although its name refers to JavaScript, almost every programming language supports it.
The building blocks of JSON
- Object: a set of “key: value” pairs inside curly braces.
- Array: an ordered list of values inside square brackets.
- String: text between double quotes.
- Numbers, the booleans true and false, and the empty value null.
Example of a product in a store:
{
"name": "Animal Coloring Book",
"price": 6.5,
"digital": true,
"sizes": ["US Letter", "A4"],
"pages": 40
}Where is JSON used?
- APIs: when your store connects to a shipping service or payment gateway, the systems usually exchange data in JSON.
- Configuration files: many apps and themes store their settings in JSON files.
- Structured data for search engines: JSON-LD tells Google about a product’s details, price, reviews and FAQs.
- Import and export: moving products or orders between platforms.
The most common JSON errors
1. Trailing comma
A comma after the last item of an object or array is an error in JSON, even though some programming languages allow it.
2. Single quotes
JSON only accepts double quotes around strings and keys.
3. Unquoted keys
Every key must be wrapped in double quotes.
4. Comments
Standard JSON does not support comments; adding them makes the file invalid.
How to read and fix JSON easily
Data coming from systems is often minified into one long line that is hard to read. Paste it into our JSON formatter and validator to display it neatly indented and pinpoint any error. Processing happens in your browser, so you can safely check files containing sensitive data.
A tip for store owners
Before editing any JSON settings file, keep a copy of the original, then validate the file after your changes. A single mistake such as a trailing comma can break your store’s or theme’s settings entirely.
Summary
JSON is a simple format with strict rules: double quotes, no trailing commas and no comments. Understanding the basics helps you handle settings, connect services and diagnose problems without relying entirely on a developer.
