API debugging
Format request and response bodies so nested fields, arrays, and null values are easier to scan.
JSON Formatter
Format, validate, and minify JSON locally
Paste JSON into the editor to check whether it is valid, convert it into readable indentation, minify it for transport, and inspect basic structure. The tool runs in your browser and does not upload JSON to AAAI Tools servers.
Waiting
Validation status
0
Input characters
0
Objects, arrays, and values
What this formatter does
- Validates syntax. It checks quotes, commas, braces, brackets, numbers, booleans, null values, and string escaping with the browser JSON parser.
- Formats for review. Pretty output uses two-space indentation, which is easy to read in docs, issue reports, and API debugging notes.
- Minifies for transfer. Compact JSON removes unnecessary whitespace when you need to paste a payload into a request body or configuration field.
Common uses
A local JSON formatter helps when you need a fast check before sharing data with teammates, saving a config file, or debugging an API response.
Config cleanup
Validate JSON configuration before pasting it into a service dashboard, build script, or deployment setting.
Documentation
Create readable examples for issue reports, guides, handoff notes, or internal support instructions.
JSON formatter FAQ
Does this support JSON with comments?
No. Standard JSON does not allow comments or trailing commas. Remove them before formatting.
Why does a valid JavaScript object fail here?
JSON is stricter than JavaScript object syntax. Keys and strings must use double quotes, and values such as undefined or functions are not valid JSON.
Is my JSON stored?
No. The pasted JSON stays in the browser tab. Clear the editor or close the tab when you are finished.
JSON formatting guide
JSON Formatter turns compact or messy JSON into readable, indented text and helps identify syntax errors before you paste data into code, API clients, configuration files, or support tickets.
Debug API responses
Format response bodies so nested fields, arrays, and objects are easier to inspect.
Prepare examples
Create readable snippets for documentation, bug reports, and teammate handoffs.
Catch syntax problems
Find missing commas, unclosed braces, invalid quotes, and other errors before using JSON in a workflow.
JSON formatting example
A compact API response becomes easier to review after indentation and basic structure counting.
Compact JSON input
{"ticket":{"id":1002,"status":"closed","tags":["billing","priority"]},"updated_at":"2026-07-18T12:30:00Z"}
Formatted JSON output
{
"ticket": {
"id": 1002,
"status": "closed",
"tags": [
"billing",
"priority"
]
},
"updated_at": "2026-07-18T12:30:00Z"
}
Sample review notes for JSON payloads
Formatted JSON is easier to read, but the useful review is whether the example is valid, small enough to share, and free of secrets while preserving the failing structure.
Expected result
The payload validates after formatting, nested fields are readable, and redacted values keep the same type and shape needed to reproduce the issue.
Failure signals
The edited payload no longer parses, arrays are accidentally removed, or tokens, emails, customer IDs, internal URLs, and session values remain visible.
Reviewer action
Validate again after every redaction pass and include a short note explaining which fields were replaced before sending the sample to support.
Real workflow note: vendor support payloads
Support tickets often need a JSON example that is readable enough for engineers but redacted enough to share. Formatting is only the first step; the final payload should preserve structure while removing private fields.
Redact with placeholders
Replace tokens, emails, account IDs, and private URLs with clear placeholders while keeping strings as strings and numbers as numbers.
Keep the failing shape
Trim unrelated fields, but preserve the object, array, status, timestamp, and error structure needed to reproduce the issue.
Validate after editing
Every redaction pass can break quotes or commas. Validate the final JSON after edits, not only before formatting.
Case study: redacting a failing API payload
A developer receives a compact payload from a failed integration. They format it, remove the bearer token and customer email, keep the error object and request ID, then validate the edited JSON before sending it to vendor support.
- Keep the failing object and error code intact.
- Replace secrets with placeholders while preserving data types.
- Validate the final JSON after redaction.
Recommended workflow
- Paste the complete JSON value, including the opening and closing braces or brackets.
- Format the JSON to make the structure readable.
- If validation fails, check the reported area for quotes, commas, and trailing punctuation.
- Minify only when you need compact output for transport or storage.
- Remove secrets before sharing formatted JSON in public tickets or chats.
Quality checks before using the result
- Confirm the formatted JSON still starts and ends with the expected object or array after redaction.
- Check nested arrays separately because many API problems are hidden several levels below the top-level status.
- Validate again after editing; a single comma, quote, or bracket can make a previously valid payload fail.
Questions about this tool
Why does JavaScript object syntax fail?
JSON requires quoted property names and does not allow comments, functions, undefined, or trailing commas.
Can I format very large JSON files?
Small and medium payloads work best. Very large files may slow the browser.
Is minified JSON encrypted?
No. Minification only removes whitespace; it does not hide or protect data.