JSON Formatter
Format, validate and beautify JSON data. Detect syntax errors with helpful messages.
How to use
- 1 Paste your JSON string into the input area.
- 2 Use the Format tab to pretty-print with proper indentation — great for reading API responses.
- 3 Use the Minify tab to compress JSON by removing all whitespace — ideal for payloads.
- 4 Use the Validate tab to check if the JSON is syntactically valid.
- 5 Click Copy to grab the result.
Key features
- Three modes in one: Format (pretty-print), Minify (compress), and Validate
- Syntax error messages show exactly where the JSON is broken
- Preserves Unicode characters and special values
- Instant results — no button press needed, updates as you type
What is a JSON Formatter?
A JSON Formatter (also called a JSON Beautifier or JSON Pretty Printer) takes raw, compact JSON and outputs it with proper indentation and line breaks, making it easy to read and debug. It is one of the most essential tools for anyone working with APIs, databases, or configuration files.
JSON (JavaScript Object Notation) is the universal data interchange format for modern software. APIs return it, databases store it, and configuration files are written in it — but the raw output is often minified into a single unreadable line. This tool solves that instantly.
Common Use Cases
Debugging API responses
Paste the raw JSON body from a REST or GraphQL API call and instantly make sense of nested objects.
Reading configuration files
Format minified package.json, tsconfig.json, or any other JSON config to quickly find what you need.
Validating before deploying
Catch missing commas or unescaped characters in JSON configs before they break your CI/CD pipeline.
Minifying for production
Reduce the size of static JSON payloads or data files before bundling them into your app.
Inspecting database records
Format JSON columns stored in PostgreSQL, MySQL, or MongoDB to read nested data at a glance.
Working with LLM outputs
Format the JSON returned by OpenAI, Anthropic, or other AI APIs to inspect structured outputs and tool calls.
Format vs Minify vs Validate
| Mode | What it does | When to use |
|---|---|---|
| Format | Adds indentation and line breaks for readability | Debugging API responses, reading configs |
| Minify | Strips all whitespace to reduce payload size | Production APIs, reducing network transfer |
| Validate | Checks whether the JSON is syntactically correct | Catching typos before deploying a config file |