API debugging
Parse the URL query, decode JWT claims, format JSON, and convert timestamp values locally.
17 local tools
Developer Tools
Format, inspect, compare, generate, encode, and convert local developer artifacts.
Local-onlyNo uploadTask chooser
Which tool should I use?
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Developer Tools tool entries
Base64 Encode/DecodeEncode Unicode text to Base64 or decode Base64 back to text locally.Runs in Tool ClusterCase/Text ConverterConvert text between uppercase, lowercase, title, sentence, kebab, snake, and camel case.Runs in Tool ClusterColor ConverterConvert HEX, RGB/RGBA, and HSL/HSLA colors with local swatches and copyable CSS output.Runs in Tool ClusterCSV to JSON ConverterConvert pasted CSV or TSV into JSON arrays locally with delimiter and header controls.Runs in Tool ClusterHash GeneratorGenerate common text hashes locally and compare checksum strings.Runs in Tool ClusterHTML Entity Escape/UnescapeEscape common HTML characters or unescape named and numeric entities.Runs in Tool ClusterImage to Base64 ConverterConvert image files to Base64 data URIs locally with FileReader and preview pasted data URIs.Runs in Tool ClusterJSON Diff CheckerCompare two JSON inputs semantically and list path-level changes locally.Runs in Tool ClusterJSON Formatter/ValidatorFormat, minify, and validate JSON with clear parser errors.Runs in Tool ClusterJSON to CSV ConverterConvert JSON arrays or objects to CSV locally with flattening and quote controls.Runs in Tool ClusterJWT DecoderDecode JWT header and payload locally, with optional HS256, HS384, and HS512 signature matching when you provide a secret.Runs in Tool ClusterULID GeneratorGenerate, validate, and decode ULID timestamps locally.Runs in Tool ClusterUnix Timestamp ConverterConvert Unix timestamps to local/UTC time and dates back to timestamps.Runs in Tool ClusterURL Encode/DecodeEncode URL components and decode percent-encoded text without sending it anywhere.Runs in Tool ClusterURL Query ParserParse full URLs or query strings into decoded rows and JSON without fetching the URL.Runs in Tool ClusterUUID GeneratorGenerate 1 to 100 UUID v4 values using the browser crypto API.Runs in Tool ClusterWord CounterCount words, characters, sentences, paragraphs, and estimated reading time locally.Runs in Tool Cluster
Practical examples
Fixture prep
Generate IDs, convert CSV to JSON, compare JSON, and export back to CSV when needed.