Free JSON Formatter & Validator
TrueFormatter helps developers format, validate, and auto-fix invalid JSON instantly — no signup, no upload, fully private.
When should you use this JSON tool?
- Fix “Unexpected token” errors from broken JSON
- Pretty-print API responses for debugging
- Minify JSON for storing or sending over network
Example (broken JSON):
{
name: "TrueFormatter",
tools: ["formatter","validator",],
// comment
version: 1
}Tip: Click Validate to see the error, then use Fix JSON to auto-repair common issues (unquoted keys, trailing commas, comments).
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Frequently Asked Questions
TrueFormatter is a free online developer tool that helps you format, validate, and beautify JSON instantly, making it easy to read and debug.
Formatting JSON online saves time, requires no installation, and works directly in your browser without storing your data.
Paste your JSON into the editor and click the Beautify or Format button. Your JSON will be formatted instantly.
Yes. TrueFormatter includes an Auto-Fixer that can repair common JSON syntax issues and convert them into valid JSON.
The Auto-Fixer can fix missing commas, remove trailing commas, strip JSON comments, quote unquoted keys, and convert single quotes to double quotes.
Click the Validate button. If your JSON is invalid but repairable, you will see a Fix JSON option for one-click repair.