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Free professional browser-based tools for data conversion, cleaning, validation, analysis, visualization, SQL, APIs, and dataset quality.

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JSON → CSV
CSV → JSON
JSON ↔ YAML
JSON Formatter
JSON Validator
XML → JSON
JSON → XML
Excel → CSV

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Schema & Metadata

Auto-detect schemas, profile metadata, document datasets.

6 ready tools out of 8 listed in this workflow.

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8

Auto Schema DetectorReadyInfer a schema (types, nullability, uniqueness) from any sample dataset.
Schema Drift DetectorReadyCompare two CSV or JSON samples for added, removed, renamed, type, nullability, and enum drift.
Schema MapperReadyMap source fields to a target schema with confidence scores.
Data Dictionary GeneratorReadyGenerate a markdown / CSV data dictionary from any dataset.
Metadata ExtractorReadyExtract row count, column types, file size, byte distribution.
Column Relationship DetectorReadySpot foreign-key candidates and 1:1 / 1:N relationships.
Star Schema DesignerPlannedDesign star schemas for data warehouses.
Snowflake Schema DesignerPlannedDesign normalized snowflake schemas.