Create a JSON object or array without worrying about quotes, commas, brackets, or braces. Choose each value’s type and watch the valid JSON appear.
Your data stays in your browser. Nothing you build is uploaded or stored.
Paste source, choose a file, or drop one here
Current path: root
Start with an object when you are describing one thing, such as a user, product, or group of settings. Start with an array when you need a list, such as several products or a sequence of values.
Add properties and items visually, nest objects and arrays as needed, and use the source view to see how the same structure is written as JSON.
Strings store text. Numbers store numeric values that software can calculate with. Booleans store a yes-or-no state as true or false. Null means no value has been supplied.
Objects hold named properties. Arrays hold ordered items. Both can contain other objects and arrays, which is how JSON represents more complex data.
For example, a product object might contain a string name, a number price, a boolean availability flag, and an array of category strings.
JSON is commonly used for API requests, sample responses, app configuration, test data, content imports, automation workflows, and data passed between browser and server applications. The builder creates standard JSON that can be copied or downloaded for use elsewhere.