JSON Formatter
Format, validate, minify, and clean JSON for APIs. Free, private, and local-first.
Use JSON Formatter
Format, minify, and validate JSON in your browser.
Paste JSON, then format, minify, or validate it locally.
Quick answer
JSON Formatter is a free online tool that helps you format, validate, minify, and clean JSON for APIs. It runs in your browser, so you can work with development data, text, files, or generated output without creating an account.
About JSON Formatter
JSON Formatter helps you format, validate, minify, and clean JSON for APIs. It is designed for focused local-first workflows where you need a quick result without creating an account or sending your input to a server.
Common uses include formatting api responses while debugging frontend or backend code, validating json configuration before deployment, minifying json payloads before saving or sending them.
Use the examples, usage notes, FAQ, and related tools below when you need to compare formats, build sample data, validate inputs, or move into the next step of the same workflow.
What this tool does
How to use JSON Formatter
- 1
Paste a raw API response, JSON config, or JSON log entry into the input area.
- 2
Choose the indentation size if you want readable formatted output.
- 3
Click Format JSON, Minify, or Validate depending on your workflow.
- 4
Review syntax errors or copy the clean output for your app, docs, or tests.
Examples
API response
{"users":[{"id":1,"name":"Alice","active":true}]}
Config file
{"port":3000,"debug":true,"features":["auth","billing"]}
Webhook payload
{"event":"order.created","data":{"id":"ord_123","total":49.99}}
Minified output
{"name":"CodeVella","local":true}
Use cases
- Formatting API responses while debugging frontend or backend code
- Validating JSON configuration before deployment
- Minifying JSON payloads before saving or sending them
- Cleaning webhook payloads copied from logs
- Preparing readable examples for documentation
- Checking mock JSON before using it in tests
Related workflow
After using JSON Formatter, many workflows continue with related tools for validation, conversion, cleanup, mock data, or final export.
Privacy and usage notes
CodeVella tools are designed to run locally in your browser. Your input is not uploaded to a server, and no account is required.
Generated test data is intended for development, QA, demos, and safe internal workflows.
Frequently asked questions
Is my data uploaded?+
No. This tool is designed to run locally in your browser.
Do I need an account?+
No signup is required for CodeVella tools.
Can this JSON formatter fix invalid JSON automatically?+
It validates JSON and shows parsing errors, but it does not guess missing quotes, commas, or brackets. Fix the syntax error first, then format or minify the valid JSON.
What is the difference between format and minify?+
Format adds indentation and line breaks so JSON is easier to read. Minify removes unnecessary whitespace so the JSON is smaller for APIs, logs, or production payloads.
Can I format large API responses?+
Yes, normal API responses and configuration files work well. Very large files depend on your browser memory because processing happens on your device.