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JSON Formatter

Pretty-print raw JSON, minify payloads, and inspect syntax errors with clear feedback.

What is JSON Formatter?

Use JSON Formatter to clean up API payloads, inspect nested objects, and quickly validate whether raw JSON is structurally correct.

Use it when an API response, webhook body or copied log field is valid JSON but too compressed or deeply nested to inspect reliably.

How to use JSON Formatter?

Step 1

Try the included example input, then replace it with a redacted sample from the system you are debugging.

Step 2

Paste JSON into the input panel.

Step 3

Choose format, minify, or validate to transform the payload instantly.

Step 4

Copy the result once the output looks correct.

Example input / output

Format a failing checkout response, confirm the nesting around the error object, then continue to JSON Validator, JSONPath Tester or JSON Diff depending on what you need to prove.

Compare the generated output with the included expected result and check that meaningful values were preserved.

Example input

{"user":{"id":42,"roles":["admin","debug"]},"active":true,"meta":{"region":"eu-west-1"}}

Example output

{
  "user": {
    "id": 42,
    "roles": [
      "admin",
      "debug"
    ]
  },
  "active": true,
  "meta": {
    "region": "eu-west-1"
  }
}

Practical developer examples

Read a compressed API response

Expand a one-line response to review status fields, nested errors and arrays. Keep the original when investigating duplicate keys or large numeric IDs, which JavaScript parsing can change.

Prepare a reproducible bug report

Format a redacted payload before adding it to a ticket or pull request so another developer can compare the exact object shape.

Common developer use cases

Formatting separates a readability problem from a syntax or contract problem. If parsing fails, use JSON Validator; if the shape is wrong, continue to Schema, Diff or JSONPath tools.

Common issues

Single quotes, comments, and trailing commas are not valid JSON.
Escaped strings may need decoding before formatting.

FAQ

What is the difference between formatting and validating JSON?

Validation checks whether the input parses as JSON. Formatting parses it and adds indentation so nested objects and arrays are easier to read. Neither operation checks your API's required fields or business rules.

Can formatting change large numbers or duplicate keys?

Yes. This tool uses JavaScript JSON.parse and JSON.stringify. Integers above Number.MAX_SAFE_INTEGER can lose precision, and duplicate object keys keep only the last value. Represent large identifiers as strings and keep the original payload for comparison.

Why does JSON copied from a log fail to format?

A log prefix, truncated body or an extra escaped string wrapper may not be a raw JSON document. Extract the complete JSON value first. JSON requires double-quoted keys and strings and does not allow comments or trailing commas.

Is JSON uploaded for formatting?

Formatting runs in your browser without sending the input to a processing API. Redact secrets and customer data before pasting; hosting, analytics and advertising services are described separately in the privacy policy.