Backend Toolkit

Compare two prompt versions word by word with a token delta.

Compare two model responses to measure drift between runs or models.

Diff two OpenAPI specs and flag breaking changes.

Pretty-print and beautify JSON with custom indentation.

Validate JSON syntax and see detailed error diagnostics.

Compress JSON by removing whitespace and show bytes saved.

Diff two JSON documents and list added, removed, and changed paths.

Explore JSON as a collapsible, color-coded tree.

Convert JSON into well-formed, indented XML.

Convert JSON documents to clean, readable YAML.

Flatten a JSON array of objects into a CSV spreadsheet.

Escape special characters for use inside a JSON string.

Reverse JSON string escaping back to readable text.

Explore JSON paths and evaluate simple JSONPath queries.

Infer a JSON Schema from a sample JSON document.

Auto-fix broken JSON: quotes, trailing commas, comments, and more.

Sort JSON object keys alphabetically, naturally, or by array field.

Merge two or more JSON documents with shallow/deep strategies.

Validate OpenAPI 3.x / Swagger 2.0 documents in JSON or YAML.

Validate JSON data against a JSON Schema (Draft-07) in your browser.

Compare two texts line-by-line with an LCS diff.

Split delimited text into aligned columns and re-join it.

Compare two lists and see common, A-only and B-only items.

Generate an XML sitemap from a list of URLs.

Convert between CSV and JSON with delimiter and header options.

Convert YAML to JSON and JSON to YAML.

Convert XML to JSON and JSON to XML using the browser's DOMParser.

Convert CSV into a Markdown or HTML table with alignment options.

Convert CSV data into well-formed XML with custom tag names.

Generate SQL INSERT statements from CSV data.

Beautify and normalize YAML with a hand-written parser.

Beautify XML and validate well-formedness using DOMParser.

Open a CSV as a sortable, searchable table and edit cells before exporting.

Convert Android string resources to JSON and back.

Encode or decode HTML entities in text.

Calculate the difference between two dates, or add/subtract time.

Diff two sets of HTTP headers, case-insensitively.

Escape and unescape strings for JSON, JS, HTML, XML, SQL, RegExp, and shell.

Side-by-side line diff of two code snippets with stats.

Validate YAML and preview it as JSON.

Compare two JSON documents and see added, removed and changed keys.

Validate Kubernetes manifests and catch risky container settings.

Check docker-compose.yml for errors, bad ports and risky settings.

Validate a GitHub Actions workflow YAML and catch security and structure mistakes.

Build a valid docker-compose.yml from a simple service form.