Loading…
Format messy JSON with configurable indentation — validate and pretty-print in one step.
Format messy JSON with configurable indentation — validate and pretty-print in one step.
Workspace
Private · Browser-based · No account · No upload
Format JSON when an API response or config file is minified into an unreadable single line. Paste, pretty-print with consistent indentation, and catch basic syntax errors before they break a deploy.
Use this for debugging webhooks, cleaning exported configs, or preparing samples for documentation. Sensitive tokens in JSON should be redacted before you share screenshots—formatting happens locally, but your clipboard and screen are still yours to protect.
For structural comparison of two payloads, use JSON Compare. For conversion workflows, pair with CSV↔JSON or YAML↔JSON tools on AllToolHub.
Paste JSON (or load the sample).
Choose indentation (2 spaces, 4 spaces, or tab).
Format — invalid JSON shows a clear parse error with position when possible.
Copy or download the pretty-printed result.
Yes. JSON Formatter on AllToolHub is free, requires no account, and is built to run in your browser without a paid plan or watermarks from us.
Processing is designed to happen locally in your browser whenever possible. payloads and tokens are handled in-page - still avoid pasting production secrets on shared machines. Standard web hosting may still log technical page requests, not your file contents.
After the first visit, the Progressive Web App cache can keep many pages available offline. Tool scripts must be cached first; heavy libraries load when you open the tool.
Validate outputs in your real environment before shipping config changes. Related tools appear in the sidebar if you need a neighboring workflow.
Modern Chrome, Edge, Firefox, Safari, and mobile equivalents. Some advanced file or crypto features need a recent browser version.
No. Pretty-printing only changes whitespace. Invalid JSON will not be reformatted until parse errors are fixed.
Format messy JSON with configurable indentation — validate and pretty-print in one step. It runs in your browser on AllToolHub with no account required.
Very large inputs may be limited by your device memory and browser. For huge files, try a desktop machine or split the work into smaller batches.
Formatter is the main entry for everyday pretty-print with indent controls. Beautifier is a focused pretty-print view of the same job.
Tips, comparisons, and how-tos related to this tool.