JSON Formatter — Free Online JSON Beautifier, Validator & Pretty Print
Free online JSON formatter and beautifier. Pretty print, validate and sort JSON with 2/4-space or tab indentation, see errors by line and column, then copy o...
To format JSON, paste it into the Input JSON box; the prettified JSON appears below with your chosen indentation, ready to copy or download.
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JSON Formatter — Free Online JSON Beautifier, Validator & Pretty Print. Free online JSON formatter and beautifier.
Pretty print, validate and sort JSON with 2/4-space or tab indentation, see errors by line and column, then copy or download clean JSON — 100% in your browser.
Our free online JSON formatter turns minified, one-line or messy JSON into clean, readable code the moment you paste it.
It works as a JSON beautifier and JSON pretty print tool in one: choose 2 or 4 spaces (any size from 0 to 10) or tab indentation, and optionally sort keys alphabetically at every level so two payloads can be compared line by line.
Setting the indent to 0 produces compact output, and the size indicator shows how many bytes the formatted version takes compared with your input.
When you are done, copy the result, download it as a .json file, or share a link that restores your JSON and settings. Every keystroke is also checked by a built-in JSON validator.
Valid documents get a green badge together with a quick structure summary — number of keys, objects, arrays and nesting depth — while broken ones show the exact problem with its line and column, such as a missing comma or an unexpected character, so you can fix API responses, config files and webhook payloads in seconds.
The parser is forgiving too: comments, single quotes, unquoted keys and trailing commas (JSON5) are accepted and converted to strict JSON, which makes it easy to prettify JSON copied from JavaScript code or logs. Formatting runs locally on this device.
Your input is saved in this browser until you clear it. This link includes your input. Anyone with the link can read it. Avoid sharing secrets. Next tasks: JSON Viewer, JSON Compare, JSON to YAML.
Frequently asked questions
Can I open a JSON file from my device?
Yes. Choose Open file, select a UTF-8 .json, .json5 or .txt file up to 256 KiB, then choose Use file to replace that editor’s text. Cancel or a validation error keeps your input unchanged. Imports allow 64 nested containers and 10,000 values including containers. Files are read locally; no file is sent by the import control. Formatter and Viewer save applied text in this browser until you clear the editor. Copy link includes your input, so avoid sharing secrets.
How do I format and beautify JSON?
Paste your JSON into the Input JSON box. The Formatted JSON appears below instantly, with keys sorted and 2-space indentation by default. Click Copy formatted JSON to copy it or Download .json to save it as formatted.json.
How do I change the indentation or use tabs?
Choose 0–10 spaces, Compact, or Tabs from the Indentation menu. Compact removes indentation and line breaks.
Can I keep the original key order?
Yes. Sort keys is on by default and orders keys alphabetically at every level; switch it off to keep the order from your input. Array items are never reordered.
How does the JSON validator show errors?
Every edit is validated. Valid input gets a Valid JSON badge with a count of keys, objects, arrays and nesting depth plus the input and output size. Invalid input shows Invalid JSON with the parser message and the line and column of the problem, such as a missing comma.
What does "Valid JSON5 — converted to strict JSON" mean?
Your input is not strict JSON but is valid JSON5, for example it contains comments, single quotes, unquoted keys or trailing commas. The tool accepts it and outputs standard JSON that any parser can read.
How do I share formatted JSON?
Click Copy link to copy a URL that restores your raw JSON together with the indent size, sort keys and tabs settings. The JSON is stored in the link itself, and the tool warns you when it is too large for a shareable URL.
How to use this online tool
JSON Formatter — Free Online JSON Beautifier, Validator & Pretty Print is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.
Private processing in your browser
JSON Formatter — Free Online JSON Beautifier, Validator & Pretty Print keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.
When this tool is useful
Use JSON Formatter — Free Online JSON Beautifier, Validator & Pretty Print for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.
Practical tips
Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.