Developer Toolbox
A simple collection of everyday dev utilities — fast, local-first, and copy-paste friendly.
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Encoding & Conversion
Quick transforms between common developer-friendly formats.
Base64 Encoder
Local-only
Convert plain text into Base64 encoding (UTF-8).
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Base64 Decoder
Local-only
Decode Base64 back into readable text (UTF-8).
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Timestamp Converter
Local-only
Convert between Unix epoch timestamps and human-readable dates (UTC/local).
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CSV ↔ JSON Converter
Local-only
Convert JSON arrays/objects into CSV/TSV with optional flattening and downloads.
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Data Tools
Validate, format, repair, generate and inspect data.
JSON Prettifier
Local-only
Format, indent, and validate JSON for readability.
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Markdown Table Generator
Local-only
Build markdown tables with a spreadsheet-like editor, preview, copy, and download.
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JSON Verify / Format / Repair
Local-only
Validate JSON, compute stats (types + depth), format it, and attempt repairs for common mistakes.
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Fake Data Generator
Local-only
Generate fake data for testing.
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JSONPath Playground
Local-only
Evaluate JSONPath expressions against JSON with live results.
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Data Analysis
A set of tools to analyse data
Diff Checker
Local-only
Compare two texts and highlight what changed.
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HAR Viewer
Local-only
Upload a HAR file, filter entries, and inspect headers, payloads, and timings locally.
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AWS ELB Log Inspector
Local-only
Parse ALB/ELB access logs, filter quickly, and export normalized JSON/CSV locally.
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Security & Certificates
Hashes, cert parsing, and PEM inspection.
Hash Generator
Local-only
Generate SHA-1, SHA-256, or SHA-512 hashes from text.
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Certificate / PEM Viewer
Local-only
Parse X.509 certificates (PEM/DER) and display subject, issuer, and validity.
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JWK / JWKS Viewer + PEM → JWK
Local-only
Inspect JWK/JWKS, compute thumbprints, and convert PEM keys/certs to JWK locally.
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AWS SigV4 Playground
Local-only
Build canonical requests, strings-to-sign, Authorization headers, and presigned URLs locally.
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Developer Productivity
Build, preview, and reuse frequently-used snippets.
Snippet Library
Local-only
Save, tag, search, import/export, and copy reusable code/text snippets (stored locally).
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Screenshot Generator
Local-only
Upload an image and generate a polished screenshot with gradients, padding, borders, rounded corners, and download as PNG.
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Log Formatter / Viewer
Local-only
Pretty-print JSON logs, highlight levels, search, and collapse repeated lines.
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Regex Tester
Local-only
Test regular expressions against text with live matches, flags, and replace preview.
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OG Image / Social Card Generator
Local-only
Generate shareable social cards with templates, gradients, logo upload, and PNG exports.
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Networking / Ops
Build and send requests and other Ops tools.
HTTP Request Builder
Network
Mini Postman: send HTTP requests with method, headers, body, and view formatted responses.
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cURL ↔ fetch ↔ Axios
Local-only
Convert curl commands to fetch or Axios (and normalize curl).
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Cron Explainer & Builder
Local-only
Build cron schedules visually, explain what they do, and preview upcoming run times.
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