How to Use JSON Formatter — Step-by-Step Guide

Step-by-step instructions

When is this useful?

Useful for inspecting API responses, configuration files, request payloads and nested objects that are difficult to read in one line.

Copy your JSON into the formatter. Start with the complete object or array when you are debugging a response.

Run the formatter to add indentation and line breaks so nested objects and arrays are easier to inspect.

If the input is invalid, look for the reported problem and inspect nearby punctuation such as commas, braces, brackets and quotation marks.

Fix one issue at a time, then run the formatter again. Valid JSON should parse into a consistent object or array structure.

Use the formatted output for debugging or documentation. Preserve the original payload separately if it is important evidence.

JSON strings require double quotes.
A trailing comma can make otherwise familiar JavaScript-style data invalid JSON.
When debugging an API, compare the failing payload with a known-valid request to isolate the change.

What does a JSON formatter do?

It improves the visual structure of JSON with indentation and line breaks, making nested data easier to inspect.

Why is my JSON invalid?

Common causes include missing quotes, unmatched braces or brackets, missing commas, and trailing commas.

Is JSON the same as a JavaScript object?

They look similar, but JSON is a data interchange format with stricter syntax rules than a JavaScript object literal.