JSON beautifier and pretty print
Formatter, beautifier, and pretty printer usually describe the same operation: adding consistent whitespace so compact data becomes easier for people to read.
Private developer tool
JSON Formatter Online
Format, beautify, validate, and minify JSON immediately. Paste text or open a local file; your JSON is processed in this browser and does not leave your device.
Your JSON stays in your browser.
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Paste JSON or upload a .json file to begin.
Shortcut: Ctrl/Cmd + Enter formats the input. Files and JSON content stay in this browser.
Readable data
What does a JSON formatter do?
A JSON formatter turns compact or inconsistently spaced JSON into readable, indented text. Also called a JSON beautifier or pretty printer, it makes nested objects and arrays easier to scan, review, compare, and debug.
ToolsWeave changes insignificant whitespace outside strings. It does not execute code, sort keys, silently repair invalid syntax, or rewrite values. String escapes, number text, duplicate keys, property order, booleans, and null remain as supplied.
How to format JSON online
- 1
Paste or upload
Add JSON to the input editor or choose a UTF-8 .json file.
- 2
Choose indentation
Select two spaces, four spaces, or tabs for the formatted output.
- 3
Format and review
Format the document and read any precise syntax message that appears.
- 4
Copy or download
Copy the result or save it as formatted.json for later use.
Built-in JSON validation
Formatting first parses the document as strict JSON. Trailing commas, single quotes, unquoted keys, and missing separators are rejected instead of being silently changed.
JSON minifier
Minifying removes spaces, tabs, and line breaks that are not part of string values. The compact result retains the same JSON data tokens.
Private browser processing
A local worker handles formatting, validation, and minification. Analytics records action names only, never editor content or uploaded filenames.
Frequently asked questions
What is a JSON formatter?
It converts valid compact or unevenly spaced JSON into a consistent indented structure without changing the underlying data.
How do I beautify JSON?
Paste or upload the document, choose an indentation style, and select Format JSON. The readable result appears in the output editor.
What is the difference between formatting and minifying?
Formatting adds whitespace for people to read. Minifying removes unnecessary whitespace for a compact representation. Both preserve valid JSON data.
Does formatting change key order or values?
No. This formatter preserves input token text and order while changing only insignificant whitespace outside strings.
Can I upload a JSON file?
Yes. Choose a UTF-8 .json file up to 5MB; the browser reads it locally rather than uploading it.
Is the JSON stored by ToolsWeave?
No. Current formatting, validation, copying, and download preparation happen locally in your browser.
Related developer tools
Use the dedicated JSON Validator, then turn object-based data into a spreadsheet-ready file with the JSON to CSV converter. You can also convert CSV back to JSON or browse the Developer Tools collection.