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Developer100% Browser-Based

JSON Formatter

A premium JSON formatter that works entirely in your browser. Format messy JSON with customizable indentation, minify for production, validate with pinpoint error locations, and export your results — all without sending a single byte to a server.

JSON Input
Ln 1Col 10 charsUTF-8JSONSpaces: 2

No JSON Loaded

Format, validate, or minify to see results

Keyboard Shortcuts

FormatCtrl+Enter
MinifyCtrl+Shift+M
ValidateCtrl+Shift+V
ClearCtrl+L

Examples

Click an example to load it into the formatter.

Format JSON

{"name":"John","age":30,"city":"New York","hobbies":["reading","coding","hiking"...

Minify JSON

{
  "status": "ok",
  "code": 200,
  "data": {
    "id": 1,
    "name": "Widget"...

Nested Objects

{"user":{"profile":{"name":"Alice","preferences":{"theme":"dark","notifications"...

Array of Objects

[{"id":1,"product":"Laptop","price":999},{"id":2,"product":"Mouse","price":25},{...

Invalid JSON

Error
{
  "name": "John",
  "age": 30,
  "city": "New York",
  "hobbies": ["reading", ...

Frequently Asked Questions

Is my JSON data sent to a server?
No. All processing happens entirely in your browser. Your JSON data never leaves your device. This is a core privacy feature of ForgePlug — everything is client-side.
What does 'Format' do?
Formatting (also called 'beautifying') takes minified or messy JSON and adds proper indentation, line breaks, and spacing to make it human-readable. You can control the indentation size (2 spaces, 4 spaces, or tabs).
What does 'Minify' do?
Minification removes all unnecessary whitespace, line breaks, and indentation from your JSON. This produces the most compact representation possible, which is useful for reducing file sizes in production APIs and data transfer.
How does validation work?
When you validate JSON, the tool parses your input and reports any syntax errors with the exact line number, column position, and a descriptive error message. This helps you quickly locate and fix issues in your JSON data.
What file formats can I upload?
You can upload any .json file or any text file containing JSON data by clicking the Upload button or dragging and dropping a file into the editor. All processing stays client-side — no file is uploaded to any server.
Can I copy or download the results?
Yes. Use the Copy button to copy the formatted/minified output to your clipboard, or use the Download button to save the result as a .json file. Both actions work entirely in your browser.
What is Auto Format?
Auto Format automatically formats your JSON as you type, with a short delay (300ms) after you stop typing. This gives you instant, continuous feedback while editing your JSON data.
4.8 · Trusted by Developers

Frequently Asked Questions

Everything you need to know about formatting and validating JSON

Is my JSON data sent to a server?
No. All processing happens entirely in your browser. Your JSON data never leaves your device. This is a core privacy feature of ForgePlug — everything is client-side.
What does 'Format' do?
Formatting (also called 'beautifying') takes minified or messy JSON and adds proper indentation, line breaks, and spacing to make it human-readable. You can control the indentation size (2 spaces, 4 spaces, or tabs).
What does 'Minify' do?
Minification removes all unnecessary whitespace, line breaks, and indentation from your JSON. This produces the most compact representation possible, which is useful for reducing file sizes in production APIs and data transfer.
How does validation work?
When you validate JSON, the tool parses your input and reports any syntax errors with the exact line number, column position, and a descriptive error message. This helps you quickly locate and fix issues in your JSON data.
What file formats can I upload?
You can upload any .json file or any text file containing JSON data by clicking the Upload button or dragging and dropping a file into the editor. All processing stays client-side — no file is uploaded to any server.
Can I copy or download the results?
Yes. Use the Copy button to copy the formatted/minified output to your clipboard, or use the Download button to save the result as a .json file. Both actions work entirely in your browser.
What is Auto Format?
Auto Format automatically formats your JSON as you type, with a short delay (300ms) after you stop typing. This gives you instant, continuous feedback while editing your JSON data.

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Runs in your browser100% privateNo data uploaded