Category documentation
Developer tools: instructions and references
Developer utilities should save a few careful minutes without becoming a data-exfiltration risk. LittleKit’s formatter, encoder and inspection tools run in the browser and show errors near the operation that needs attention.
Choosing a tool: Treat these tools as a local scratchpad. Validate the format before transforming it, keep secrets out of shared screenshots and remember that a decoded token is not an authenticated token. Use the smallest input that reproduces the problem.
17 tool references, grouped by category. Searches stay in this tab.
Developer tools
Browse category Developer tools
JSON to CSVBuilds CSV columns from the union of object keys, preserving first-seen order.JSON FlattenerConverts nested JSON leaves into JSON Pointer paths.JSON to JSON LinesSerializes each element of a JSON array as one independent compact JSON line.JSON Lines to JSONParses each nonblank line separately and collects the records into one JSON array.JSON FormatterParses strict JSON and serializes with two-space indentation.JSON ValidatorUses the browser’s strict JSON parser.JSON MinifierParses strict JSON and removes insignificant formatting whitespace.Base64 EncodeEncodes text as UTF-8 bytes, then standard Base64.Base64 DecodeDecodes standard Base64 bytes as strict UTF-8 text.URL EncodePercent-encodes one URL component using UTF-8.URL DecodeDecodes percent-encoded UTF-8 sequences in a URL component.HTML EncodeEscapes &, <, >, double quotes and apostrophes for HTML text.HTML DecodeDecodes numeric entities and amp, lt, gt, quot, apos and nbsp.UUID GeneratorGenerates random version-4 UUIDs with the browser’s Web Crypto API.Unix Timestamp ConverterUnix time measures elapsed seconds or milliseconds since 1970-01-01T00:00:00Z.Regex TesterRuns JavaScript regular expressions in an isolated Web Worker with a 300 ms execution limit.JWT DecoderBase64url-decodes the header and payload as UTF-8 JSON.