All tools

• formatter

  JSON Formatter & Validator

  Paste JSON to validate it and instantly reformat or minify it.

• formatter

  SQL Query Formatter & Explainer

  Format complex SQL queries across dialects, and paste MySQL, SQLite, or PostgreSQL EXPLAIN output to highlight performance bottlenecks.

• tester

  Regex Tester & Explainer

  Test regular expressions against sample text with live match highlighting, and get a plain-English breakdown of what the pattern actually does.

• tester

  Text Diff Checker

  Compare two blocks of text side by side or unified, with word-level highlighting inside changed lines, whitespace/case-insensitive options, and a copyable unified diff.

• tester

  JSON Diff Checker

  Compare two JSON documents structurally — ignores key order, highlights real value changes in a tree, and exports a JSON Patch (RFC 6902).

• converter

  Base64 Encoder / Decoder

  Encode text or files to Base64, or decode Base64 back to text or a downloadable file — instantly, entirely in your browser.

• converter

  Timestamp / Unix Time Converter

  Convert Unix timestamps to readable dates and back, in one input.

• converter

  JSON to TypeScript Converter

  Paste JSON and instantly generate TypeScript interfaces or types.

• converter

  Cron Expression Generator

  Build a cron expression visually, or paste one in to see what it means in plain English.

• converter

  Prisma Schema ↔ SQL DDL Converter

  Convert between Prisma schema and MySQL/PostgreSQL DDL, including relations, enums, and indexes.

• converter

  Search Filter Query Builder

  Build search filter conditions visually and get the exact syntax for Meilisearch, Algolia, Elasticsearch, and Typesense.

• converter

  CSV ↔ JSON Converter

  Convert between CSV and JSON, with automatic type inference and a choice of comma, tab, or semicolon delimiters.

• converter

  YAML ↔ JSON Converter

  Convert between YAML and JSON, with automatic type inference and support for nested objects and arrays.

• converter

  XML ↔ JSON Converter

  Convert between XML and JSON, with automatic attribute handling and array detection for repeated elements.

• converter

  JWK ↔ PEM Converter

  Convert RSA and EC keys between JWK (JSON Web Key) and PEM format entirely in your browser, with an RFC 7638 thumbprint shown for every key.

• converter

  Number Base Converter

  Convert integers between decimal, hexadecimal, octal, and binary, live, with support for negative values and 0x/0o/0b prefixes.

• generator

  UUID Generator

  Generate RFC 9562-compliant UUID v4 (random) or v7 (time-ordered) values in bulk, entirely in your browser.

• generator

  Hash Generator

  Generate MD5, SHA-1, SHA-256, and SHA-512 hashes or HMACs from text or files, entirely in your browser.

• generator

  QR Code Generator

  Generate custom QR codes for URLs, WiFi, contacts, and more — plus batch-generate and decode QR images, free and entirely in your browser.

• generator

  JSON Schema Mock & Validator (Redis Pub/Sub)

  Define a JSON Schema per event, generate realistic mock payloads, and validate real messages against it — with Redis Pub/Sub presets and a ready-to-run redis-cli PUBLISH output, all in your browser.

• decoder

  JWT Decoder

  Paste a JWT to instantly decode its header and payload, with optional client-side signature verification.

• web3

  ABI Decoder & Encoder

  Decode calldata and event logs, or encode function calls, using any contract ABI.

• web3

  Ethereum / EVM Unit Converter

  Convert between Wei, Gwei, and Ether, and estimate gas fees for legacy or EIP-1559 transactions.

• web3

  Smart Account (ERC-4337) UserOp Builder

  Build an ERC-4337 UserOperation for EntryPoint v0.6 or v0.7 and see its JSON, packed encoding, and UserOpHash.

• web3

  LayerZero Chain ID / Endpoint ID (EID) Converter

  Look up any LayerZero V2 chain by name, EVM chain ID, or Endpoint ID (eid), and get its matching chain ID, eid, and EndpointV2 contract address — ready to copy. Covers LayerZero V2's EVM mainnet and testnet deployments.

• web3

  LayerZero OApp Options (Executor Options) Builder

  Build and decode LayerZero V2 executor options bytes — lzReceive gas, native drop, lzCompose gas, and ordered execution — for use with send() or setEnforcedOptions().

• web3

  LayerZero Peer Address ↔ bytes32 Converter

  Convert an EVM address to and from the left-zero-padded bytes32 form LayerZero V2's setPeer(uint32,bytes32) requires, and generate the ready-to-use setPeer calldata — with eid lookup by chain name, chain ID, or eid.

• web3

  LayerZero V2 Raw Packet Decoder

  Decode a raw LayerZero V2 packet — the encodedPayload bytes from a PacketSent event, or copied from LayerZero Scan — into its version, nonce, source/destination eid, sender, receiver, guid, and message fields.

• web3

  LayerZero DVN Config Decoder

  Decode a LayerZero V2 ULN (DVN) config — the raw bytes from getConfig(), or a full setConfig(...) calldata — into human-readable Confirmations, Required/Optional DVN lists resolved to provider names, and Optional DVN Threshold.