How do I format JSON in JavaScript?

Use JSON.stringify(value, null, indent) where indent is the number of spaces. Example: JSON.stringify(myObj, null, 2) returns a 2-space indented JSON string.

How do I pretty print JSON in Node.js?

console.log(JSON.stringify(data, null, 2)) prints formatted JSON to the Node.js console. You can also write it to a file with fs.writeFileSync("output.json", JSON.stringify(data, null, 2)).

Can I use FixTools to check JSON from a fetch() response?

Yes. Call response.json() in your app, JSON.stringify the result, copy it, and paste it into FixTools for formatted inspection.

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Format JSON in JavaScript

JavaScript's JSON.stringify() is the built-in way to format JSON: `JSON.stringify(obj, null, 2)` produces pretty-printed output with 2-space indentation. In Node.js you can log formatted JSON with `console.log(JSON.stringify(obj, null, 2))`. For a quick visual check — without opening a terminal or writing any code — paste the JSON into FixTools and format it instantly in your browser.

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How to use this tool

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Paste JSON from your JavaScript application into FixTools to inspect or validate it visually.

How It Works

Step-by-step guide to format json in javascript:

1
Serialise your JS object
In JavaScript: `JSON.stringify(myObject, null, 2)` or `console.log(JSON.stringify(myObject, null, 2))` to print formatted JSON.
2
Paste into FixTools
Copy the JSON output from the console or your app and paste it into FixTools.
3
Format and inspect
Click Format to see the full structure with syntax highlighting — useful when the JSON is deeply nested or very large.