Format JSON Without Confusing Syntax and Validation
Property names and string values need double quotes.
Check the basic JSON rules
Property names and string values need double quotes. Comments, trailing commas and undefined are not part of standard JSON. The formatter reports a syntax problem before producing a new layout.
Indentation changes presentation
Pretty output makes nested objects and arrays easier to follow; compact output removes insignificant whitespace. Neither operation decides whether a required field is present or an API will accept the payload. That needs a schema or application-specific validation.
Keep large identifiers intact
Some parsers represent numbers with limited precision. The formatter preserves the original numeric tokens rather than writing them back from a floating-point value. A destination system may still require a large identifier to be represented as a string.
Review duplicate properties
The tool preserves duplicate names instead of silently choosing one. Duplicate-key handling differs between consumers, so syntax success does not make such a document unambiguous. Resolve duplicates according to the intended data model.
Put it into practice
Text Difference Checker
Compare two text versions line by line and see inserted, removed and unchanged lines.
Developer toolsJSON Formatter & Validator
Validate JSON, indent it for reading or remove extra whitespace while preserving original number tokens.
Developer toolsBase64 Encoder & Decoder
Encode UTF-8 text as Base64 or decode standard and URL-safe Base64 back to text.
Developer tools