JSON Formatter
The JSON Formatter pretty-prints compact JSON into a readable, indented structure and validates it as you type. It is the fastest way to make an API response or config file human-readable and to catch syntax errors before they break your code.
Key Features
- Pretty-print with configurable indentation
- Live validation and clear error positions
- Collapsible tree view for large documents
- Spot invalid characters and trailing commas
- Copy or download the formatted result
- Runs locally, no upload
Use Cases
- Read a minified API response from a logs panel
- Check why a config file fails to parse
- Share a readable version of a payload with a teammate
- Inspect nested structures quickly
How to Use
- Paste or upload your JSON
- Watch it format and validate in real time
- Expand or collapse nodes to explore
- Fix any highlighted errors
- Copy or download the clean output
Practical Tips
- Use 2-space indent for web code, 4-space for configs
- A trailing comma is invalid in strict JSON but valid in JSON5
- Format before diffing two payloads to reduce noise
FAQ
- Does it change my data?
- No, formatting only changes whitespace; the values stay identical.
- Can it handle huge files?
- Yes, but very large files are easier to explore with the collapse feature.