JSON Formatter
Format, validate, minify and inspect JSON instantly in your browser.
JSON input
Formatted output
What is a JSON Formatter?
A JSON formatter takes a raw, minified, or otherwise unreadable JSON string and produces a clean, indented, human-readable version. Whether you're debugging an API response, inspecting a webhook payload, or just trying to make sense of a config file, having well-formatted JSON saves time and prevents copy-paste mistakes.
What this tool does
- Format / Beautify — choose 2 spaces, 4 spaces, or tabs for indentation.
- Minify — strip whitespace to ship JSON in the smallest possible form.
- Validate — get clear error messages with line numbers when your JSON is malformed.
- Sort keys — alphabetise object keys to make diffs cleaner.
- Inspect — see key count, max depth and size in bytes at a glance.
Tips
- Press Ctrl+Enter (or ⌘+Enter) to format.
- Drag-and-drop a
.jsonfile directly onto the input panel. - Files larger than 1 MB are parsed in a Web Worker so your browser stays responsive.
- Your data never leaves your browser — the entire tool runs locally.
JSON quick reference
JSON (JavaScript Object Notation) is a lightweight data-interchange format defined by RFC 8259. Valid JSON must use double-quoted keys, no trailing commas, and supports six value types: object, array, string, number, boolean, and null.