JSON tools
Format, validate, and minify
JSON Formatter & Validator
Format, validate, pretty print, minify, copy, and download JSON locally in your browser without uploading developer data.
Semantic structural comparison
JSON Diff & Compare
Compare two JSON documents locally and identify added, removed, and changed values with readable paths and type-aware semantics.
Local structured-data conversion
JSON to CSV Converter
Convert a JSON object or array of objects to UTF-8 CSV locally, with nested-object flattening and spreadsheet formula protection.
Encoding, conversion, and identifiers
Encoding and decoding
Base64 Decoder & Encoder
Decode Base64 or Base64URL to inert UTF-8 text and encode Unicode text locally.
Epoch and date conversion
Unix Timestamp Converter
Convert explicit Unix seconds or milliseconds to dates and structured dates back to timestamps.
Exact BigInt conversion
Hex to Decimal Converter
Convert hexadecimal integers, including large values, to exact decimal output.
Exact BigInt conversion
Decimal to Hex Converter
Convert whole decimal integers to uppercase or lowercase hexadecimal output.
Cryptographic identifiers
UUID Generator
Generate one or up to 100 random UUID v4 values with secure browser cryptography.
Strict, predictable processing
Inputs are handled as data with strict parsers and native browser APIs. They are never evaluated as code.