What Is a JSON Formatter?
A JSON Formatter takes raw, compacted, or poorly indented JSON and converts it into a clean, human-readable structure with proper indentation and line breaks. It's an essential tool for any developer working with APIs, config files, or data pipelines.
Why Use an Online JSON Formatter?
- Instant readability — Turn a single-line API response into a scannable tree structure.
- Find errors faster — Proper indentation exposes mismatched braces or missing commas immediately.
- Zero setup — Works directly in your browser. No Node.js, no npm packages.
- 100% private — Your JSON never leaves your device.
How to Use This Tool
- Paste your JSON into the Input panel on the left.
- Choose your preferred indentation (2 spaces, 4 spaces, or tab).
- Click Format JSON — the prettified output appears instantly on the right.
- Click Copy to copy the result, or Download to save as a
.jsonfile.
Before & After Example
Before:
{"name":"Alice","age":30,"roles":["admin","editor"],"address":{"city":"Mumbai","zip":"400001"}}After (2-space indent):
{
"name": "Alice",
"age": 30,
"roles": [
"admin",
"editor"
],
"address": {
"city": "Mumbai",
"zip": "400001"
}
}Pro Tips
- Use the Load Sample button to see a realistic example instantly.
- The tool validates your JSON while formatting — errors are shown in red.
- Combine with the JSON Minifier when you need to compact it back.