JSON & Data
178 free json & data tools in the Developer Tools collection — every one runs in your browser with no signup and no uploads. Page 1 of 2.
JSON Formatter & Validator
Pretty-print, minify and validate JSON instantly.
SQL Playground
Run real SQL against an in-browser SQLite database — no install, no server.
CSV Explorer & Cleaner
Paste or upload a CSV, then sort, filter, de-duplicate and export it.
ai-plugin.json Builder
Generate a ChatGPT plugin manifest file for your API
Apache Avro Schema Types
Avro primitive, complex and logical types with JSON schema representation.
Avro Schema Viewer
Parse and visualize Apache Avro schema JSON files as a collapsible tree.
Cargo.toml Builder (Rust)
Generate a Cargo.toml for a Rust library or binary project
wrangler.toml Builder (Cloudflare Workers)
Generate a wrangler.toml for Cloudflare Workers deployment
composer.json Builder (PHP)
Generate a composer.json for a PHP project or Laravel app
Config File Diff (ENV / TOML / INI)
Diff two .env, .toml, or .ini config files and see key-level changes
CSS Media Query Reference
Search CSS media features, types, and operators with Level 4 range syntax.
CSV Cleaner
Trim whitespace, fix encodings, and normalize line endings in CSV files
CSV Column Statistics
Get min, max, mean, median, std-dev, and null-count per CSV column
CSV Date Format Normalizer
Detect and normalize inconsistent date columns in CSV to ISO 8601.
CSV Deduplicator
Remove duplicate rows from a CSV by one or more key columns
CSV Diff
Compare two CSV files row-by-row and highlight added, removed, changed rows
CSV Field Escaper/Unescaper
Wrap and escape fields with commas, quotes, or newlines in CSV
CSV Offline Geocoder (City / Country Level)
Add lat/lon to a CSV city column using an embedded gazetteer — no API.
CSV Joiner
Join / merge two CSV files on a shared key column (SQL-style LEFT JOIN)
CSV Outlier Detector
Flag statistical outliers in numeric CSV columns using IQR or Z-score.
CSV Pivot Table Builder
Build pivot tables from a CSV — rows, columns, values, aggregation
CSV Splitter
Split a large CSV into smaller chunks by row count or column value
CSV to GeoJSON Converter
Build GeoJSON from a CSV with lat/lon columns — instant map-ready output
CSV to GraphQL Mutation Generator
Turn a CSV into ready-to-run GraphQL createX mutation calls, one per row.
CSV to KML Converter
Build Google Earth KML from a CSV with lat/lon columns
CSV to NDJSON Converter
Convert CSV to Newline-Delimited JSON for log pipelines and BigQuery
CSV to XLSX Converter
Convert a CSV file into an Excel .xlsx workbook right in your browser
CSV to XML Converter
Convert CSV rows to XML elements with configurable root and row tag names
CSV to YAML Converter
Convert CSV data to a YAML list of mappings for config files and pipelines
CSV Column Type Inferrer
Detect the probable data type of each CSV column — date, int, float, bool
DNS-over-HTTPS Privacy Query Tester
Resolve a domain via Cloudflare or Google DoH and compare the answers side by side
ESLint Config Schema Reference
All ESLint flat-config and .eslintrc fields with types and plugin extension.
Expo app.json Config Reference
All Expo app.json / app.config.js fields with platform scope and type.
Fake GeoJSON Generator
Random GeoJSON features for mapping tool demos
firebase.json Builder
Generate a Firebase Hosting config with rewrites and cache headers
GeoJSON Minifier
Strip whitespace and round coordinate precision to shrink GeoJSON files
GeoJSON Geometry Simplifier
Simplify complex GeoJSON geometries with Visvalingam-Whyatt to reduce size
GeoJSON to GPX Converter
Convert GeoJSON Features and FeatureCollections to valid GPX 1.1
GeoJSON to TopoJSON Converter
Convert GeoJSON to TopoJSON to shrink file size via shared arcs
GeoJSON Validator
Validate GeoJSON against RFC 7946 and show geometry errors inline
GPX to GeoJSON Converter
Turn GPS tracks into GeoJSON for web maps and data pipelines
Grafana Dashboard JSON Stub Builder
Generate a minimal Grafana dashboard JSON with panels and variables
GraphQL Schema Builder
Generate a GraphQL SDL schema with types, queries, and mutations
GraphQL Schema Visualizer
Paste a GraphQL SDL schema and see type relationships as a graph.
Helm Chart values.yaml Builder
Generate a Helm chart values.yaml for a standard app deployment
JSON Diff
Compare two JSON objects and see added, removed, and changed fields
JSON-LD Article Schema Builder
Generate Article structured data markup for blog posts and news
JSON-LD BreadcrumbList Schema Builder
Build breadcrumb structured data for cleaner Google search snippets
JSON-LD Event Schema Builder
Create Event structured data for concerts, webinars, and conferences
JSON-LD FAQ Schema Builder
Build FAQ structured data to earn rich results in Google Search
JSON-LD HowTo Schema Builder
Build HowTo structured data to earn step-by-step rich results
JSON-LD JobPosting Schema Builder
Generate job posting structured data for Google Jobs rich results
JSON-LD LocalBusiness Schema Builder
Generate LocalBusiness structured data for Google Maps rich results
JSON-LD Organization Schema Builder
Generate Organization structured data for your company or brand
JSON-LD Person Schema Builder
Create Person structured data for author pages and knowledge panels
JSON-LD Product Schema Builder
Create Product structured data with price, availability, and reviews
JSON-LD Recipe Schema Builder
Build Recipe structured data to appear in Google's recipe rich results
JSON-LD Review Schema Builder
Create Review structured data for testimonials and product reviews
JSON-LD SoftwareApplication Schema Builder
Generate app structured data with OS, rating, and price for app pages
JSON Lines / NDJSON Viewer
Browse and filter NDJSON files line-by-line with a searchable table
JSON Schema Keywords Reference
All JSON Schema 2020-12 keywords with applicability, type constraint and scope.
JSON Schema Validator
Validate JSON documents against a JSON Schema (draft-07 / 2020-12)
JSON String Escaper/Unescaper
Escape control chars and backslashes for valid JSON strings
JSON to CBOR Converter
Encode JSON to compact CBOR binary and see the hex dump and byte savings.
JSON to GraphQL Schema Generator
Generate a GraphQL SDL schema from a sample JSON object
JSON to HTML Table
Convert a JSON array of objects into a clean HTML table — copy or preview.
JSONC / JSON5 Syntax Reference
JSON with Comments and JSON5 extensions compared against standard JSON.
JSONPath Syntax Reference
JSONPath operators, filters and recursive descent with IETF RFC 9535 syntax
Kubernetes Deployment YAML Builder
Generate a K8s Deployment with replicas, resources, and probes
Kubernetes Ingress YAML Builder
Generate a K8s Ingress manifest with host rules and TLS configuration
Kubernetes Secret YAML Builder
Generate a K8s Secret manifest with base64-encoded values
Kubernetes Service YAML Builder
Generate a K8s Service manifest for ClusterIP, NodePort, or LoadBalancer
PWA manifest.json Builder
Generate a complete Web App Manifest for progressive web apps
Mock CSV Generator
Downloadable CSV test data in seconds
Mock SQL Rows Generator
Ready-to-run INSERT statements with realistic fake data for any table
Mock TOML Generator
Fake TOML config files for Rust and other tools
Mock YAML Generator
Fake YAML config files for testing and demos
Mock XML Generator
Structured XML test data for legacy systems
MySQL Data Types Reference
All MySQL column types with storage, range, and STRICT mode behavior.
NDJSON Validator
Validate every line of an NDJSON file and report parse errors by line number
netlify.toml Builder
Generate a Netlify configuration with build settings and redirects
nx.json Config Builder
Generate an nx.json configuration for Nx-managed monorepos
OpenAPI Response Schema Patterns
HTTP status to OpenAPI response schema conventions with RFC alignment.
package.json Builder
Generate a complete package.json for any Node.js project
package.json Fields Reference
Every package.json field with type, semantics and npm/bundler behavior notes
Parquet Schema Viewer
Inspect the schema and metadata of a Parquet file without a backend
PostgreSQL Data Types Reference
All PostgreSQL data types with storage size, range and alias names.
Prisma Schema Field Types
All Prisma scalar types, relation types and native type modifiers with DB mapping.
Prisma Query Operators Reference
All Prisma where clause operators — equals, contains, startsWith, in, gt, lte.
Protobuf Decoder (No Schema)
Decode raw Protobuf wire bytes without a .proto file, right in your browser.
Protocol Buffers Field Types
All protobuf scalar types with wire type, JSON mapping and default values.
pyproject.toml Builder
Generate a PEP 621 pyproject.toml for a Python package or app
JSON-LD Schema Markup Generator
Structured data snippets for SEO and AI discovery
Random JSON Schema Generator
Valid JSON Schema documents for API tooling tests
Shapefile to GeoJSON Converter
Convert ESRI Shapefiles to GeoJSON entirely in the browser
XML Sitemap Validator
Validate a sitemap.xml for schema compliance and detect malformed entries
sitemap.xml Builder
Generate a valid XML sitemap with URLs, priorities, and change frequencies
SQL Aggregate Functions Reference
SQL aggregate functions across MySQL, PostgreSQL, SQLite and SQL Server.
SQL CREATE TABLE Statement Builder
Generate a CREATE TABLE SQL statement with columns, types, and constraints
SQL Date/Time Functions Reference
Date and time functions across SQL dialects — MySQL, PostgreSQL, SQLite, MSSQL.