Dev tools
you actually
reach for.
Format JSON. Decode JWTs. Test regex. Generate UUIDs. Hash text. Check HTTP headers. All instant, all free, nothing stored.
JSON Formatter & Validator
Paste raw JSON — it's instantly prettified, validated, and any errors are highlighted with line numbers.
"version":"1.0",
"free":true}
"name": "alldevtools",
"version": "1.0",
"free": true
}
JSON & Data
7 toolsJSON Formatter
Beautify or minify JSON with syntax highlighting and instant error detection.
FormatterJSON Diff
Compare two JSON objects side-by-side. Highlights added, removed, and changed keys.
DiffJSON → CSV
Convert JSON arrays to CSV or TSV. Handles nested objects and batch download.
ConvertJSON → TypeScript
Paste JSON — get TypeScript interfaces or Zod schemas generated automatically.
GenerateJSONPath Tester
Test JSONPath and JMESPath expressions against live data. Shows matching nodes instantly.
QueryYAML ↔ JSON
Convert between YAML and JSON in one click. Perfect for config files and CI pipelines.
ConvertJSON Schema Validator
Validate a JSON document against a JSON Schema. Detailed error paths, draft-07 & 2020-12.
ValidateCode Utils
8 toolsBase64 Encode / Decode
Encode text or files to Base64 and decode it back. Handles URL-safe Base64 and binary data.
EncodeURL Encode / Decode
Percent-encode and decode URLs or query strings. Works on full URLs or components.
EncodeRegex Tester
Write and test regex patterns live. Match highlighting, group capture, flag controls, and cheatsheet.
RegexJS / CSS Minifier
Minify JavaScript or CSS instantly. Shows file size reduction. One-click copy output.
MinifyDiff Checker
Compare two texts or code files side-by-side. Line and word-level highlighting, split & unified view.
DiffMarkdown Preview
Write Markdown and see the rendered output live. Supports GFM tables, task lists, and code fences.
PreviewCron Expression Builder
Build or decode cron expressions visually. Shows the next 10 run times in your local timezone.
CronHTML Entity Encoder
Encode special characters to HTML entities and decode them back. Useful for safe output in templates.
EncodeDev Generators
6 toolsUUID Generator
Generate v1, v4, or v7 UUIDs in bulk. Copy single or export as JSON, CSV, or plain list.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 from text or file. 100% client-side — nothing sent to a server.
HashJWT Decoder
Decode and inspect JWT tokens — header, payload, expiry. Verify signatures client-side with your secret.
JWTSecure Password Generator
Cryptographically secure passwords with configurable length, symbols, and live entropy score.
GenerateULID Generator
Generate sortable, timestamp-decodable ULIDs. Better than UUID for database primary keys.
GenerateMock Data Generator
Generate realistic fake data — names, emails, addresses, numbers — as JSON, CSV, or SQL inserts.
GenerateNetwork & HTTP
10 tools| Tool | |
|---|---|
|
http
HTTP Headers Checker TOOL_031 |
arrow_outward |
|
dns
DNS Lookup TOOL_032 |
arrow_outward |
|
terminal
cURL Command Builder TOOL_033 · Coming Soon |
schedule |
|
public
IP Info Lookup TOOL_034 |
arrow_outward |
|
security
SSL Certificate Checker TOOL_035 |
arrow_outward |
|
manage_search
WHOIS Lookup TOOL_037 |
arrow_outward |
|
cable
Port Checker TOOL_038 |
arrow_outward |
|
api
HTTP Request Builder TOOL_039 |
arrow_outward |
|
screenshot_monitor
Website Screenshot TOOL_040 |
arrow_outward |
|
redirect
Redirect Chain Tracer TOOL_036 |
arrow_outward |