JSON Formatter Online
Paste minified API JSON and get readable, indented output instantly. Parsing stays on your device so tokens and payloads are not sent to a server.
How to use JSON Formatter
Drop the text, table, or snippet that needs json formatter into the input box.
Toggle the checkboxes or fields if the tool offers them, then watch the output update.
Use Copy or Save. Because this runs locally, you can work on private data without an account.
Why use this tool?
The Problem
Minified API responses hide missing commas and nested keys in a single line that is painful to debug.
The Solution
This formatter parses the text as JSON and reprints it with stable 2-space indentation so objects and arrays are easy to scan.
Common Use Cases
- Debug API responses
- Read minified config files
- Share readable JSON in tickets
How it works
JSON.parse reads the input, then JSON.stringify(value, null, 2) writes the pretty result. Invalid JSON returns the parser error instead of guessing. All calculations and text processing routines execute locally using standard JavaScript inside your browser. No contents are uploaded to any server.
Before / After Example
{"user":{"id":12,"name":"Ada"},"ok":true}{
"user": {
"id": 12,
"name": "Ada"
},
"ok": true
}Tips & Best Practices
If it errors, look for trailing commas and single quotes — standard JSON allows neither.
Common Mistakes
JavaScript objects with unquoted keys will fail. Convert those to JSON first.
Frequently Asked Questions
How do I use JSON Formatter online?
Paste your input into JSON Formatter, adjust any options, and copy the result. Format and indent JSON files. All processing stays in the tab.
Does JSON Formatter upload my data?
No. JSON Formatter runs in your browser with JavaScript. Answer to Geek does not receive the text, CSV, tokens, or files you paste.
Is JSON Formatter the same as JSON Beautifier?
Both pretty-print. Use Formatter for everyday indenting, Beautifier when you want a second pass on already-valid JSON, and Validator when you only need a pass/fail check.
What should I try after JSON Formatter?
Related tools on this site include json validator, json beautifier, json minifier. Open those when you need a follow-up transform on the same data.