Format, validate and minify JSON data. Instantly spot syntax errors with clear error messages. No signup, browser-based.
Powerful features, completely free — no strings attached.
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JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. Originally derived from JavaScript, JSON is now the universal standard for APIs, configuration files, and data storage across virtually every programming language and platform.
APIs and databases often return "minified" JSON — all on one line with no whitespace, to save bandwidth. While this is efficient for transmission, it is nearly impossible to read. Formatting (beautifying) JSON adds proper indentation and line breaks, making the structure immediately clear — you can see nested objects, array items, and key-value relationships at a glance.
Valid JSON has strict rules: strings must use double quotes (not single), trailing commas are not allowed, keys must be quoted, and only specific value types are permitted (string, number, boolean, null, object, array). Our formatter highlights syntax errors so you can fix them before using the data in your application.
If you work extensively with JSON and APIs, you might also find our Base64 encoder useful for encoding JSON payloads, and our Hash Generator for creating checksums of JSON data.