Every format has edge cases. These tools know them.

jq, SQL, JSON, cron, CSV. Formatters, validators, and playgrounds that run entirely in your browser. Paste, tune, copy, done.

Browse 11 tools

Developer Tools

11 tools

Playgrounds

Jqbin

The jq playground developers actually keep open.

Try it

Oktal

Hex math that shows its work in every base.

Try it 4 bases at once

Toklen

Token count and cost: exact for GPT, estimated for Claude and Gemini.

Try it GPT exact, rest estimated

Formatters

Tidysql

Format SQL in seconds, right in the browser.

Try it 14 dialects

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Jsonr

The fastest, cleanest JSON formatter online.

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Pipefmt

Paste a messy table. Get a perfect one, aligned as you type.

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Validators

Lintcron

See exactly which cron field is wrong, and why.

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Converters

Rowson

CSV to JSON in one paste.

Try it 4 output shapes

Rolemat

Build an RBAC matrix. Export it anywhere.

Try it 50 x 100 grid

Epochr

The Unix timestamp converter that tells you what you're looking at.

Try it 4 timestamp units

Diff

Diffpad

Paste. Compare. Copy the diff.

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Pick the tool by the task

Slice a JSON payload with real jqJqbinWASM jq, permalinks, 20+ recipes Format SQL before it goes to reviewTidysql14 dialects, before/after diff Validate and pretty-print JSONJsonrerrors with exact line and column Compare two configs structurallyDiffpadsemantic JSON and YAML diff, copyable summary Find which cron field is brokenLintcronfield-level validation, next-run preview Align a Markdown table with CJK textPipefmtwide-character alignment, live preview Turn a CSV into JSONRowsonauto delimiter detection, four output shapes Decode flags and permission masksOktalhex, decimal, octal, and binary at once Document an RBAC matrixRolemat50 roles by 100 permissions, CSV/MD/JSON export Identify a timestamp's unitEpochrseconds, ms, µs, ns auto-detect Count prompt tokens and costToklenGPT, Claude, and Gemini

14SQL dialects Tidysql formats

0server round-trips per format

100%client-side processing

The architecture is the privacy policy.

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