Does this JSON formatter upload my JSON?

No. Formatting and validation run locally in your browser with JavaScript.

Can this tool minify JSON?

Yes. Use Minify JSON to remove whitespace and produce compact JSON output.

What happens when JSON is invalid?

The tool shows the parser error and keeps your original input available for correction.

Data Utility

JSON Formatter / Validator

Format JSON, validate syntax, minify payloads, sort object keys, and copy clean output locally in your browser. Useful for API debugging, logs, config files, and data cleanup.

JSON input Indentation Sort object keys alphabetically

Formatted output

JSON Formatter for API debugging

Use this page when JSON needs to be readable, valid, compact, or stable before the next debugging step.

Best for

Formatting API responses, validating copied JSON, minifying payloads, sorting keys before comparison, and preparing clean JSON for tests or documentation.

Not for

Repairing broken JSON automatically, validating JSON Schema, storing payload history, or processing secrets that require a fully audited local environment.

Common debugging workflow

Paste the payload, validate strict JSON, format it for review, optionally sort keys, then move the clean output into JSON Diff, JSON to CSV, JSON to TypeScript, or JSON Escape / Unescape.

API response cleanup checklist

Validate strict JSON syntax before sharing the payload.
Format nested objects so required fields are easy to inspect.
Sort keys only when object order is not meaningful for your workflow.
Minify when copying into curl, environment variables, fixtures, or compact examples.
Send both formatted versions to JSON Diff when comparing environments.

Sample input/output

Input: {"user":{"id":7,"active":true}}
Formatted: indented JSON with user.id and user.active on separate lines.
Minified: compact JSON for scripts, tests, API clients, and small docs examples.

Common errors and fixes

Case	Example	Fix
Trailing comma	`{"name":"Ada",}`	Remove the final comma; strict JSON does not allow it.
Unquoted key	`{name:"Ada"}`	Wrap object keys in double quotes.
Comments	`{"ok":true // note}`	Remove comments before formatting strict JSON.
Bad backslash	`{"path":"C:\tmp"}`	Escape backslashes, for example `C:\\tmp`.
Duplicate keys	`{"id":1,"id":2}`	Avoid relying on duplicates; most parsers keep the last value.
Large payload	Huge arrays or logs	Formatting is local, but very large input can affect browser memory.

Related workflow

Compare two cleaned payloads with JSON Diff / Compare.
Flatten arrays or objects into spreadsheet output with JSON to CSV.
Generate implementation handoff types with JSON to TypeScript Interface.
Unescape quoted log JSON with JSON Escape / Unescape.

Move between structured data tools without leaving the browser.

JSON to CSV Converter

Flatten JSON arrays into spreadsheet-ready CSV.

XML Formatter / Validator

Format and validate XML from APIs, feeds, and config files.

YAML to JSON Converter

Convert YAML config snippets into formatted or minified JSON.

JSON to YAML Converter

Turn JSON into readable YAML for config files and docs.