Dev
JWT decoder
Read a JWT header and payload, with human timestamps and an expired flag. The token stays in the tab.
Dev tools
Inspect tokens, generate hashes, convert timestamps, diff text, and convert data formats on your machine. Nothing leaves the tab.
Dev
JSON to CSV converter
Turn an array of objects into a CSV, flattening one level of nested objects.
Dev
YAML to JSON converter
Convert YAML to JSON, or JSON to YAML, in one page. Parsing stays in the browser.
Dev
Text diff checker
Compare two texts with a live line and word diff. Optional ignore-whitespace.
Dev
Hash generator
Calculate SHA-256, SHA-384, SHA-512, and SHA-1 checksums for text or local files.
Dev
Timestamp converter
Convert Unix epoch timestamps in seconds or milliseconds to ISO 8601, UTC, and local time.
Dev
CSV to JSON converter
Convert CSV records to a JSON array of objects with header mapping and type detection.
Dev
Subnet calculator
Calculate IPv4 network address, broadcast, usable range, subnet mask, and host capacity from CIDR.
Dev
CIDR calculator
Calculate IPv4 CIDR blocks, network address, broadcast address, netmask, usable hosts, and wildcard mask.