Why is my JSON invalid?

Most often: trailing commas, single quotes, unquoted keys, or unescaped newlines inside strings.

Yes - toggle 'Sort keys' for canonical output.

Free · developer tool Browser-only · No upload

Free JSON Formatter

Paste raw JSON and get back a perfectly indented, easy-to-read structure with optional alphabetical key sorting and minify mode. Errors come back with the exact line and column so you can fix malformed payloads in seconds. 100% client-side - your data never leaves your browser.

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What this tool does

2/4-space or tab indent
Minify to single line
Sort keys alphabetically
Pinpoint syntax errors with line/column
Browser-only - never uploaded

How to use the free JSON Formatter

1Paste JSONDrop any raw JSON into the input panel.
2Pick a mode2/4 spaces, tab, or minify.
3Copy or downloadGrab the formatted output with one click.

Why people love it

Read deep API responses without scrolling sideways
Produce canonical JSON for diffs and code review
Debug malformed webhook bodies fast

Examples

Minified → readable

Input

{"id":1,"name":"Ada"}

Output

{
  "id": 1,
  "name": "Ada"
}

Privacy first

This json formatter runs 100% in your browser. Nothing you paste, drop, or generate ever leaves your device - no analytics on your input, no uploads, no logs.