Developer

Short reads on tools and developer topics.

Source Map Decoder

Decode one position in a source map mappings string. See the original file, line, and column. The source is not fetched.

JSON Pointer Resolver

Find the value at one JSON pointer. An empty pointer selects the whole document. A missing member is an error.

Line Set Compare

Compare two lists by whole-line membership. See lines only in A, only in B, and in both, without an ordered edit.

IPv6 Subnet Calculator

Calculate the IPv6 network, first address, last address, and exact address count from one address and a prefix. Nothing is looked up.

Unicode Normalization

Normalize pasted text to NFC, NFD, NFKC, or NFKD in the browser. Copy returns the normalized string only.

IEEE-754 Binary64 Converter

Convert one JavaScript number or 16 hex digits into the binary64 layout: sign, exponent, trailing significand, and hex bits.

32-bit Bitwise Calculator

Combine unsigned 32-bit values with AND, OR, XOR, NOT, or a logical shift. Negatives and shifts past 31 are errors.

IPv4 Subnet Calculator

Calculate an IPv4 network, mask, and usable host count from an address and a prefix length. Nothing is looked up.

chmod Calculator

Show the same Unix mode as checkboxes, a 4-digit octal value, and ls-style permission text. Clear sets 0000.

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