JSON Formatter Online: Beautify, Minify and Validate
Clean up, compress or validate JSON without switching tools. Choose indentation, sort keys, escape non-ASCII characters and inspect syntax errors before you copy or download the result.
Read the full guideDirect answer
A JSON formatter turns compact or inconsistent JSON into readable, consistently indented text. AppKiro also minifies valid JSON and checks strict RFC 8259 syntax; comments and trailing commas remain invalid.
Paste your JSON, choose the output mode and copy a clean result.
Valid JSON
Input JSON
Output — Beautified
Options
Tip: drag and drop a .json file, or paste from clipboard.
Statistics
324
Input chars
383
Output chars
28
Output lines
4
Max depth
12
Object keys
2
Arrays
+18.21%
Size change
Quick Actions
100% private — runs in your browser
Your JSON is parsed, formatted, and validated locally. Nothing is uploaded to any server.
How to use it
- Paste JSON or drag a
.jsonfile into the input editor. - Choose Beautify, Minify or Validate, then set indentation, key sorting, Unicode escaping and the final newline.
- Review the formatted output and statistics, then copy or download the JSON.
Key features and settings
- Beautify with 2 spaces, 4 spaces or Tab indentation.
- Minify by removing nonessential whitespace while preserving JSON values.
- Validate strict JSON and report a line/column location for syntax errors.
- Sort object keys, escape non-ASCII characters and compare output size/depth statistics.
Supported input and output
Input: JSON text, .json. Output: formatted or minified JSON text, .json.
Use cases
- Review API responses and webhook payloads.
- Normalize fixtures or configuration files before committing them.
- Reduce payload size for testing or quickly locate malformed JSON.
Which workflow should you choose?
Use JSON Formatter Online for: Beautify with 2 spaces, 4 spaces or Tab indentation. Use JSON to JSON Schema Generator for: Draft selection from legacy drafts through 2020-12 in the current UI.
Privacy and data path
In the current paste/upload workflow, the content is processed in the browser.
Limits and troubleshooting
- Comments, single quotes and trailing commas belong to JSON5/JSONC—not strict JSON—so remove them before validating.
- There is no universal size promise; large-input performance depends on browser memory and device capability.
FAQ
Does the validator support JSON5 or JSONC?
No. The current validator targets strict JSON. Comments, single-quoted strings and trailing commas produce errors.
Is my data uploaded to a server?
In the current paste/upload workflow, the content is processed in the browser.
What are the file or data limits?
There is no universal size promise; large-input performance depends on browser memory and device capability.
Does it work on mobile?
The page is web-based and may work in a modern mobile browser, but file-picker behavior, memory and cross-device compatibility are not verified for every device. Use a desktop browser for large or complex inputs.
Which workflow should you choose?
Use JSON Formatter Online for: Beautify with 2 spaces, 4 spaces or Tab indentation. Use JSON to JSON Schema Generator for: Draft selection from legacy drafts through 2020-12 in the current UI.
Related tools
Paste your JSON, choose the output mode and copy a clean result.