.jsonl QA Fixtures AI & Model Weights CC0 Public Domain · CI/CD Safe

Sample .jsonl (JSONL) Test Files & Edge Cases

Deterministic JSON Lines / Newline-Delimited JSON fixtures engineered for automated unit tests, parser fuzzing, and upload validation pipelines. Pull directly in GitHub Actions with immutable SHA-256 verification.

minimalexpect: valid

minimal-sft.jsonl

3-line UTF-8 JSON Lines fine-tuning dataset with LF delimiters.

↓ Download (308 B)

SHA-256: 85b7b589f6426c997e2e17ca60dc35cf0285c8408f1141b39ef574a13de69918

Exact: 308 bytes

curl -fsSL https://fileformat.co/fixtures/v1/jsonl/minimal-sft.jsonl -o minimal-sft.jsonl \
  && echo "85b7b589f6426c997e2e17ca60dc35cf0285c8408f1141b39ef574a13de69918  minimal-sft.jsonl" | shasum -a 256 -c

realisticexpect: valid

multilingual-rag-chunks.jsonl

10-line JSONL stream featuring CJK/Japanese text, ZWJ emoji sequences, nested arrays, and nullable fields.

↓ Download (2.5 KB)

SHA-256: 20fb244b631707aecb497b1c320f5fde5504679044c7e799326c686bcac6d0a5

Exact: 2,575 bytes

curl -fsSL https://fileformat.co/fixtures/v1/jsonl/multilingual-rag-chunks.jsonl -o multilingual-rag-chunks.jsonl \
  && echo "20fb244b631707aecb497b1c320f5fde5504679044c7e799326c686bcac6d0a5  multilingual-rag-chunks.jsonl" | shasum -a 256 -c

edge-caseUTF-8 BOM + BigInt + Malformed Lineexpect: parser_error

bom-bigint-malformed.jsonl

Starts with EF BB BF BOM, contains 9007199254740993 (> JS Number.MAX_SAFE_INTEGER), and ends with a truncated JSON record.

↓ Download (210 B)

SHA-256: 7b279351978bf216b68fca66051d03953d625b0555450c3f8c59051e0b8f0568

Exact: 210 bytes

curl -fsSL https://fileformat.co/fixtures/v1/jsonl/bom-bigint-malformed.jsonl -o bom-bigint-malformed.jsonl \
  && echo "7b279351978bf216b68fca66051d03953d625b0555450c3f8c59051e0b8f0568  bom-bigint-malformed.jsonl" | shasum -a 256 -c

Safe-by-Design Client-Side Synthesizer

In-Browser Edge-Case & Malformed Fixture Mutator

Zero Upload · Generated in RAM

Need negative test fixtures for parser fuzzing or upload gateway validation? Mutate minimal-sft.jsonl directly in your browser without hosting unsafe payloads on public URLs.

1. Base Input Source

Default Fixture: minimal-sft.jsonl

2. Select Mutation Operator

Tests graceful EOF / footer corruption handling without process panic or OOM.