zippydevtoolsJSON
JSON Formatter
Format JSON with readable indentation for debugging and documentation.
Process the input to see the result here.
Format valid JSON with readable indentation and catch common syntax issues before using payloads in APIs or config files.
When to use
Use it when JSON comes minified, copied from logs, or returned by an API and you need to inspect keys, arrays, and nested objects.
Input
Paste a valid JSON object or array. Strings need double quotes and trailing commas are not allowed.
Output
The output is indented JSON for review or a syntax error when the parser cannot read the input.
- Paste raw, minified, or API-returned JSON.
- Run formatting and review the indented structure.
- If an error appears, fix commas, quotes, escapes, braces, or brackets.
- Use JSON Minifier, JSON Validator, or JSON to TypeScript for the next workflow step.
- API debugging: Turn minified responses into readable payloads for reviewing fields and nested objects.
- Configuration review: Review JSON config files before committing or copying them into documentation.
- Type preparation: Format a sample before generating TypeScript interfaces or validating syntax.
- Trailing commas: Standard JSON does not allow an extra comma after the last object or array item.
- Unquoted keys: Unlike JavaScript objects, JSON requires double quotes around property names.
- Large payloads: Very large inputs depend on browser memory and performance.
- No schema validation: Formatting does not validate business rules or JSON Schema; it only parses syntax.
- JSON Formatting, Validation, and TypeScript Workflow
Move from unreadable JSON to validated payloads and TypeScript interfaces with a practical workflow for API responses and config files.
Format a JSON object
Input: {"name":"Ana","ok":true}
Output: Indented JSON output.
Is this JSON formatter private?
Yes. Standard formatting runs locally in your browser, with no dedicated backend for processing the JSON you paste.
Does my JSON leave the browser?
No, not through the tool execution. Text pasted into the JSON field is formatted in the browser.
Can I minify JSON too?
Yes. Use the related JSON Minifier tool when you need compact single-line JSON for payloads or tests.
What happens if my JSON is invalid?
The formatter shows a validation error. Check for missing commas, quotes, closing brackets, or closing braces.
Can I format large JSON files?
Large payload performance depends on your browser and device memory. Validate the output before using it in production.
How do I use this tool safely?
Use the tool as a short workflow: review the expected input, run processing, and validate the output: Fields: JSON (textarea, required). Example workflow: {"name":"Ana","ok":true} -> Indented JSON output.. Enter the requested input, run the tool, and review validation messages or warnings before copying the result.
Which inputs and outputs should I check?
Check this tool's input fields, examples, and output before using the result: JSON (textarea, required). Use the fields, formats, and limits described in the tool interface; review the output before applying it to critical workflows.