Private JSON Formatter, Validator & Minifier
Format and Clean JSON Securely
Developers format and minify JSON constantly. However, pasting internal configuration JSON or customer payloads into online tools can expose database credentials or user details. JSONDiet formats, validates, and minifies JSON locally. It is offline-capable, runs entirely in the browser, and keeps all data safe in your environment.
Format JSON in 4 Steps
- Step 1: Paste your raw JSON string or upload a .json file.
- Step 2: Click 'Format' for 2-space indentation or 'Minify' to compress.
- Step 3: Read validation messages to locate syntax or position errors.
- Step 4: Copy the output or download it as a file.
Frequently Asked Questions
Q: Is my JSON private with JSONDiet?
A: Absolutely. The formatting and validation logic is written in local JavaScript. No external network request is made during JSON actions.
Q: How large of a JSON payload can I format?
A: You can format files up to several megabytes. The performance depends on your device's browser memory and CPU capacity.
Need a different tool or task?
Explore our full suite of local, secure, privacy-first conversion and manipulation utilities.
View All Tools & Tasks Directory