The Data Toolkit - Free Developer Utilities

Here at The Data Toolkit you find everything you need to work with data — JSON, SQL, conversions, encoding, and more. Privately and quickly.

JSON Tools

JSON Validator

Validate and check errors in JSON with precise line and column location.

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JSON Formatter

Format and beautify your JSON with customizable indentation and key sorting.

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JSON Minifier

Compress JSON by removing spaces and line breaks to save bandwidth.

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JSON Diff

Compare two JSONs side by side and visualize the differences clearly.

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JSON Converter

Convert JSON to CSV, XML, YAML or other popular formats.

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Schema Validator

Validate your JSON against a JSON Schema to ensure correct structure and types.

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JSON Escape / Unescape

Escape special characters in JSON strings or unescape sequences back to readable text.

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Fake JSON Generator

Generate realistic fake JSON data for testing with configurable field types and array sizes.

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SQL Tools

SQL Formatter

Format and beautify SQL queries with configurable indentation, dialect, and keyword case.

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SQL Minifier

Strip comments and whitespace to compact SQL queries to a single line.

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JSON to SQL INSERT

Convert a JSON array into INSERT statements for MySQL, PostgreSQL, SQLite, or SQL Server.

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CREATE TABLE from JSON

Infer column types from a JSON array and generate a CREATE TABLE DDL statement for any SQL dialect.

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CSV to SQL INSERT

Convert CSV data into INSERT statements for MySQL, PostgreSQL, SQLite, or SQL Server with auto-delimiter detection.

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SQL Parameter Replacer

Inline SQL parameters for debug inspection. Supports ?, $1, :name, and @name placeholder styles.

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SQL Functions Reference

Searchable reference of SQL functions across PostgreSQL, MySQL, SQLite, and SQL Server. Filter by category and dialect.

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API Tools

API Mock Builder

Build mock API responses with custom status codes, headers, and simulated delay.

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cURL Converter

Convert a cURL command into code for fetch, axios, Python, Node, Go, and more.

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JWT Decoder

Decode and inspect JWT tokens. View header, payload, and signature — all client-side.

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HTTP Status Code Reference

Browse and search all HTTP status codes with descriptions, categories, and usage notes.

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Webhook Signature Generator & Validator

Generate or verify HMAC signatures for Stripe, GitHub, Shopify, Slack, or custom webhook schemes.

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OpenAPI / Swagger Inspector

Paste an OpenAPI 3.x or Swagger 2.x spec (JSON or YAML) and browse endpoints, parameters, and responses.

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User Agent Parser

Parse any User-Agent string into browser, OS, device, and engine details.

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Basic Auth Generator

Encode or decode HTTP Basic Authentication credentials. Builds the Authorization header from username/password or extracts them from a header.

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URL Parser

Parse any URL into protocol, host, port, path, query parameters, and hash. Inspect each part separately.

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API Response Diff

Compare two JSON API responses side by side. Highlights added, removed, and changed fields with options to ignore array order or specific keys.

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