Valid JSON formatting
Inntak
{"name":"Alice","age":28,"tags":["api","debug"]}
Úttak
Pretty: multi-line with indentation Minify: one-line JSON
JSON Formatter & Minifier
Pretty-print or minify JSON and pinpoint errors with line and column details.
Paste, run, and copy in one short flæði. Inntak data is processed only in your browser.
Inntak data is never sent to a server (browser-only processing).
Safe for confidential data handling.
How to use
- Paste JSON into the inntak pane.
- Click Pretty or Minify.
- Copy the úttak and you are done.
Shortcuts
Ctrl/Cmd + Enter: Pretty
Ctrl/Cmd + Shift + Enter: Minify
Ctrl/Cmd + L: Clear (with confirmation)
Sample
Invalid JSON
Inntak
{"name":"Alice","age":28,}
Úttak
Error banner shows line, column, and nearby snippet
What is JSON formatting?
Formatting adds indentation and line breaks for readability, making debugging and yfirferðs easier.
What is JSON minify?
Minify removes whitespace and line breaks to reduce payload size and keep JSON compact.
Common errors and fixes
- Trailing comma (example: {"a":1,})
- Missing tilboðs around keys or string values
- Comment tokens included (standard JSON does not support // or /* */)
Algengar spurningar
I get an error
The verkfæri shows line, column, and nearby text. Use Jump to Error to move the cursor to the exact inntak location.
Can I use commented JSON (JSONC/JSON5)?
Standard JSON does not allow comments. Enable “Strip comments before parse” only when needed (not fully compatible).
Large JSON feels slow
Parsing and stringify run in the browser. The UI uses size-based guards to keep inntak responsive.
Is data uploaded?
No. Parsing, formatting, and minifying are done locally in your browser.
I see \uXXXX úttak
Turn Unicode Escape off to úttak readable characters directly.