Local processing
The tool runs in the browser, so ordinary text stays on your device while you work.
Developer Text Tools
JSON Formatter Online
Format messy JSON into readable indentation, or compress it into a compact string.
Text Tools Workspace
How to use this tool
Inspect compact or hard-to-read JSON, validate its syntax, and produce either an indented or minified result.
Steps
- Paste a JSON object, array, string, number, boolean, or null into the input.
- Choose Format, Minify, or Validate, then use the error message to locate malformed input.
- Review the detected type and item counts before copying the result.
Work with JSON locally
Paste JSON to format, minify, or validate it. The tool is useful for API responses, config files, and copied data snippets.
Fast copy workflow
Generate or transform the result, then copy it directly for use in code, docs, forms, or test data.
FAQ
Does this tool upload my text?
No. The calculation runs in your browser. ToolsLab does not upload the text you enter into this tool.
Can I use it on mobile?
Yes. The page is designed for quick edits on mobile and desktop browsers.