JSON (JavaScript Object Notation) is the most common data format on the web. APIs return it, config files use it, and developers work with it daily. But raw JSON, especially from API responses, is often minified into a single unreadable line.
Why JSON Formatting Matters
Minified JSON saves bandwidth but is nearly impossible to read:
{"users":[{"id":1,"name":"Kim","roles":["admin","editor"]},{"id":2,"name":"Park","roles":["viewer"]}]}Formatted JSON reveals the structure:
{
"users": [
{
"id": 1,
"name": "Kim",
"roles": ["admin", "editor"]
},
{
"id": 2,
"name": "Park",
"roles": ["viewer"]
}
]
}Common JSON Errors
| Error | Example | Fix |
|---|---|---|
| Trailing comma | `{"a": 1,}` | Remove the last comma |
| Single quotes | `{'a': 1}` | Use double quotes |
| Unquoted keys | `{a: 1}` | Add double quotes: `{"a": 1}` |
| Missing comma | `{"a": 1 "b": 2}` | Add comma between entries |
How to Format and Validate JSON Quickly
- Paste your JSON into the JSON ↔ YAML Converter.
- Keep the mode on JSON → YAML if you want a structural validation pass before converting.
- Switch to YAML → JSON to bring the data back as neatly indented JSON.
- Copy the cleaned output once the structure looks correct.
JSON vs. YAML
YAML is more human-readable for config files, while JSON is better for data exchange. Need to convert? Try our JSON ↔ YAML Converter.
Tips
- Use a formatter before debugging: Formatted JSON makes it much easier to find the issue.
- Validate before sending: Always validate JSON before using it in API requests or config files.
- Check encoding: Ensure special characters are properly escaped (
\n,\t,\").