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Valid JSON of every top-level type. Use Try example where available to see the expected shape.
JSON Formatter
Format or minify strict JSON without rounding numeric literals.
Last reviewed: · Testing methodology
How to use
Format or minify strict JSON without rounding numeric literals.
Choose options and run
Select the relevant mode or settings. Automatic tools update as you type; other tools use the labeled primary action.
Review the result
Check the result against your input, then use the available copy or download action. Edits clear or recompute the result.
Examples and checks
How this tool works
Strict lossless JSON token parser and serializer. Processing stays in your browser.
- Input
- {"id":9007199254740993}
- Output
- The numeric literal remains 9007199254740993; Tab uses actual tab characters
Limits and questions
Inputs are processed in your browser. Analytics and advertising can make separate network requests.
Format and Validate JSON Privately
The JSON formatter beautifies, validates, and helps debug JSON data in your browser. It is a safer workflow for API payloads, configuration snippets, and logs that may contain internal data.
JSON Formatter vs JSON Validator
Formatting makes JSON easier to read with indentation and line breaks, while validation checks whether the structure is valid. This tool supports both workflows so developers can inspect data faster.
Common Developer Use Cases
Use the formatter when reviewing API responses, cleaning minified JSON, preparing examples for documentation, or locating syntax errors before pasting data into code or test fixtures.
Limits, edge cases, and troubleshooting
At most 1,000,000 characters, 100,000 values and 128 levels. Comments and trailing commas are rejected. Numeric spelling, key order and duplicate members are retained.
When to use another workflow
Use your target editor or runtime when exact platform behavior or a broader capability is required.
Verification
Review record: 2026-08-26. See the documented behavior and limitations above, and the testing standards for the scope of review.
Testing methodologyFrequently asked questions
- What does this tool support?
- Valid JSON of every top-level type. At most 1,000,000 characters, 100,000 values and 128 levels. Comments and trailing commas are rejected. Numeric spelling, key order and duplicate members are retained.
- Where is my input processed?
- Tool calculations and conversions run locally in your browser. Existing analytics and advertising requests are separate from input processing.