JSON Formatter

Web

Freedom report

Two barsScore 6.3

JSON Formatter is ranked #8 of 29 in JSON tools on Freedom251. It runs on Web. There is a free plan.

JSON Formatter plans and pricing

JSON Formatter Free All tools free · no sign-up · no hard file-size limit; depends on your machine json-formatter.org · 3 Oct 2026

Purpose: The browser tool formats, validates, and minifies JSON, and reports syntax errors with their line and column.
Indentation: Formatting supports 2 or 3 or 4 spaces, or tabs.
Standards: Validation supports RFC 8259, RFC 7159, RFC 4627, and ECMA-404.
Repair: The repair feature handles common invalid JSON such as single quotes, unquoted keys, trailing commas, comments, and Python-style True/None literals.
JSONPath: A JSONPath filter extracts selected fields from a document.
Sharing: Share links pack the JSON into the link itself without using a server to store it.
Command-line input: The formatter can extract JSON bodies from pasted curl or wget commands using -d, --data, or --json.
Local processing: Formatting, validation, minification, and filtering run in the browser, and the site says JSON is not uploaded, stored, or logged.
File size: The site says there is no hard file-size limit and that practical capacity depends on the user's machine; documents in the tens of megabytes work in modern browsers.
Workflow features: The page lists dark mode, drag-and-drop upload, download, autosave, and Ctrl+F search.
Shortcuts: Ctrl+Enter (Cmd+Enter on Mac) formats input, Ctrl+F opens search, and Tab indents.
Audience: The site describes formatting as useful for reading and debugging minified API and log JSON, and for catching syntax errors before production.
Price from: Free

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