diff --git a/README.md b/README.md
index 1437bfc..be2d577 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,12 @@
-# File-specification
-Specification of file formats and directory structures
+# ClusterCockpit Standardization of APIs and data formats
+
+## RESTful API specifications
+
+The specifications are defined following the (https://www.openapis.org)[OpenAPI Initiative] format standard.
+
+## Data exchange formats
+
+Main data exchange format is JSON.
+The specifications are defined following the (https://json-schema.org)[JSON schema] format standard.
+
+## Database schemas
diff --git a/dataformat/json/cluster.schema.json b/dataformat/json/cluster.schema.json
new file mode 100644
index 0000000..43baae1
--- /dev/null
+++ b/dataformat/json/cluster.schema.json
@@ -0,0 +1,50 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "HPC Cluster description",
+    "description": "Meta data information of a HPC cluster",
+    "type": "object",
+    "properties":{
+        "cluster_id": {
+            "description": "The unique identifier of a cluster",
+            "type": "string"
+        },
+        "processor_type": {
+            "description": "Processor type",
+            "type": "string"
+        },
+        "sockets_per_node": {
+            "description": "Number of sockets per node",
+            "type": "integer"
+        },
+        "cores_per_socket": {
+            "description": "Number of cores per socket",
+            "type": "integer"
+        },
+        "threads_per_core": {
+            "description": "Number of SMT threads per core",
+            "type": "integer"
+        },
+        "flop_rate_scalar": {
+            "description": "Theorethical node peak flop rate for scalar code in GFlops/s",
+            "type": "integer"
+        },
+        "flop_rate_simd": {
+            "description": "Theorethical node peak flop rate for SIMD code in GFlops/s",
+            "type": "integer"
+        },
+        "memory_bandwidth": {
+            "description": "Theorethical node peak memory bandwidth in GB/s",
+            "type": "integer"
+        }
+    },
+    "required":[
+        "cluster_id",
+        "processor_type",
+        "sockets_per_node",
+        "cores_per_socket",
+        "threads_per_core",
+        "flop_rate_scalar",
+        "flop_rate_simd",
+        "memory_bandwidth"
+    ]
+}
diff --git a/dataformat/json/job-data.schema.json b/dataformat/json/job-data.schema.json
new file mode 100644
index 0000000..37f66be
--- /dev/null
+++ b/dataformat/json/job-data.schema.json
@@ -0,0 +1,135 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Job metric data",
+    "description": "Meta data information of a HPC job",
+    "type": "object",
+    "properties": {
+        "mem_used": {
+            "description": "Memory capacity used (required)",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "flops_any": {
+            "description": "Total flop rate with DP flops scaled up (required)",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "mem_bw": {
+            "description": "Main memory bandwidth (required)",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "net_bw": {
+            "description": "Total fast interconnect network bandwidth (required)",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "file_bw": {
+            "description": "Total file IO bandwidth (required)",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "ipc": {
+            "description": "Instructions executed per cycle",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "cpu_used": {
+            "description": "CPU core utilization",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "flops_dp": {
+            "description": "Double precision flop rate",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "flops_sp": {
+            "description": "Single precision flops rate",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "rapl_power": {
+            "description": "CPU power consumption",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "gpu_used": {
+            "description": "GPU utilization",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "gpu_mem_used": {
+            "description": "GPU memory capacity used",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "gpu_power": {
+            "description": "GPU power consumption",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "clock": {
+            "description": "Average core frequency",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "eth_read_bw": {
+            "description": "Ethernet read bandwidth",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "eth_write_bw": {
+            "description": "Ethernet write bandwidth",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_read_bw": {
+            "description": "Lustre read bandwidth",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_write_bw": {
+            "description": "Lustre write bandwidth",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_read_req": {
+            "description": "Lustre read requests",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_write_req": {
+            "description": "Lustre write requests",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_inodes": {
+            "description": "Lustre inodes used",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_accesses": {
+            "description": "Lustre open and close",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_fsync": {
+            "description": "Lustre fsync",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_create": {
+            "description": "Lustre create",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_open": {
+            "description": "Lustre open",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_close": {
+            "description": "Lustre close",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "lustre_seek": {
+            "description": "Lustre seek",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "ib_read_bw": {
+            "description": "Infiniband read bandwidth",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "ib_write_bw": {
+            "description": "Infiniband write bandwidth",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        },
+        "ib_congestion": {
+            "description": "Infiniband congestion",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-metric-data.schema.json"
+        }
+    },
+    "required": [
+        "mem_used",
+        "flops_any",
+        "mem_bw",
+        "net_bw",
+        "file_bw"
+    ]
+}
diff --git a/dataformat/json/job-meta.schema.json b/dataformat/json/job-meta.schema.json
new file mode 100644
index 0000000..2434f43
--- /dev/null
+++ b/dataformat/json/job-meta.schema.json
@@ -0,0 +1,238 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Job meta data",
+    "description": "Meta data information of a HPC job",
+    "type": "object",
+    "properties": {
+        "job_id": {
+            "description": "The unique identifier of a job",
+            "type": "string"
+        },
+        "user_id": {
+            "description": "The unique identifier of a user",
+            "type": "string"
+        },
+        "project_id": {
+            "description": "The unique identifier of a project",
+            "type": "string"
+        },
+        "cluster_id": {
+            "description": "The unique identifier of a cluster",
+            "type": "string"
+        },
+        "num_nodes": {
+            "description": "Number of nodes used",
+            "type": "integer",
+            "exclusiveMinimum": 0
+        },
+        "exclusive": {
+            "description": "Job uses only exclusive nodes",
+            "type": "boolean"
+        },
+        "walltime": {
+            "description": "Requested walltime of job in seconds",
+            "type": "integer",
+            "exclusiveMinimum": 0
+        },
+        "job_state": {
+            "description": "Final state of job",
+            "type": "string",
+            "enum": [
+                "completed",
+                "failed",
+                "canceled",
+                "timeout"
+            ]
+        },
+        "start_time": {
+            "description": "Start epoch time stamp in seconds",
+            "type": "integer",
+            "exclusiveMinimum": 0
+        },
+        "stop_time": {
+            "description": "Stop epoch time stamp in seconds",
+            "type": "integer",
+            "exclusiveMinimum": 0
+        },
+        "duration": {
+            "description": "Duration of job in seconds",
+            "type": "integer",
+            "exclusiveMinimum": 0
+        },
+        "nodes": {
+            "description": "List of nodes",
+            "type": "array",
+            "items": {
+                "type": "string"
+            },
+            "minItems": 1,
+            "uniqueItems": true
+        },
+        "tags": {
+            "description": "List of tags",
+            "type": "array",
+            "items": {
+                "type": "object",
+                "properties": {
+                    "name": {
+                        "type": "string"
+                    },
+                    "type": {
+                        "type": "string"
+                    }
+                },
+                "required": [
+                    "name",
+                    "type"
+                ]
+            },
+            "uniqueItems": true
+        },
+        "statistics": {
+            "description": "Job statistic data",
+            "type": "object",
+            "properties": {
+                "mem_used": {
+                    "description": "Memory capacity used (required)",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "flops_any": {
+                    "description": "Total flop rate with DP flops scaled up (required)",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "mem_bw": {
+                    "description": "Main memory bandwidth (required)",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "net_bw": {
+                    "description": "Total fast interconnect network bandwidth (required)",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "file_bw": {
+                    "description": "Total file IO bandwidth (required)",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "ipc": {
+                    "description": "Instructions executed per cycle",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "cpu_used": {
+                    "description": "CPU core utilization",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "flops_dp": {
+                    "description": "Double precision flop rate",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "flops_sp": {
+                    "description": "Single precision flops rate",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "rapl_power": {
+                    "description": "CPU power consumption",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "gpu_used": {
+                    "description": "GPU utilization",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "gpu_mem_used": {
+                    "description": "GPU memory capacity used",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "gpu_power": {
+                    "description": "GPU power consumption",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "clock": {
+                    "description": "Average core frequency",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "eth_read_bw": {
+                    "description": "Ethernet read bandwidth",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "eth_write_bw": {
+                    "description": "Ethernet write bandwidth",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_read_bw": {
+                    "description": "Lustre read bandwidth",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_write_bw": {
+                    "description": "Lustre write bandwidth",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_read_req": {
+                    "description": "Lustre read requests",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_write_req": {
+                    "description": "Lustre write requests",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_inodes": {
+                    "description": "Lustre inodes used",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_accesses": {
+                    "description": "Lustre open and close",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_fsync": {
+                    "description": "Lustre fsync",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_create": {
+                    "description": "Lustre create",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_open": {
+                    "description": "Lustre open",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_close": {
+                    "description": "Lustre close",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "lustre_seek": {
+                    "description": "Lustre seek",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "ib_read_bw": {
+                    "description": "Infiniband read bandwidth",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "ib_write_bw": {
+                    "description": "Infiniband write bandwidth",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                },
+                "ib_congestion": {
+                    "description": "Infiniband congestion",
+                    "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/job-statistic.schema.json"
+                }
+            },
+            "required": [
+                "mem_used",
+                "flops_any",
+                "mem_bw",
+                "net_bw",
+                "file_bw"
+            ]
+        }
+    },
+    "required": [
+        "job_id",
+        "user_id",
+        "project_id",
+        "cluster_id",
+        "num_nodes",
+        "start_time",
+        "stop_time",
+        "duration",
+        "nodes",
+        "tags",
+        "statistics"
+    ]
+}
diff --git a/dataformat/json/job-metric-data.schema.json b/dataformat/json/job-metric-data.schema.json
new file mode 100644
index 0000000..8d0cbb5
--- /dev/null
+++ b/dataformat/json/job-metric-data.schema.json
@@ -0,0 +1,83 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Job metric data",
+    "description": "Metric data of a HPC job",
+    "type": "object",
+    "properties": {
+        "unit": {
+            "description": "",
+            "type": "string"
+        },
+        "scope": {
+            "description": "",
+            "type": "string",
+            "enum": [
+                "node",
+                "cpu",
+                "socket"
+            ]
+        },
+        "timestep": {
+            "description": "Measurement interval in seconds",
+            "type": "integer"
+        },
+        "series": {
+            "description": "",
+            "type": "array",
+            "items": {
+                "type": "object",
+                "properties": {
+                    "node_id": {
+                        "type": "string"
+                    },
+                    "id": {
+                        "type": "integer"
+                    },
+                    "statistics": {
+                        "type": "object",
+                        "properties": {
+                            "avg": {
+                                "description": "Series average",
+                                "type": "number",
+                                "minimum": 0
+                            },
+                            "min": {
+                                "description": "Series minimum",
+                                "type": "number",
+                                "minimum": 0
+                            },
+                            "max": {
+                                "description": "Series maximum",
+                                "type": "number",
+                                "minimum": 0
+                            }
+                        },
+                        "required": [
+                            "avg",
+                            "min",
+                            "max"
+                        ]
+                    },
+                    "data": {
+                        "type": "array",
+                        "items": {
+                            "type": "number",
+                            "minimum": 0
+                        },
+                        "minItems": 1
+                    }
+                },
+                "required": [
+                    "node_id",
+                    "data"
+                ]
+            }
+        }
+    },
+    "required": [
+        "unit",
+        "scope",
+        "timestep",
+        "series"
+    ]
+}
diff --git a/dataformat/json/job-statistic.schema.json b/dataformat/json/job-statistic.schema.json
new file mode 100644
index 0000000..04d5e93
--- /dev/null
+++ b/dataformat/json/job-statistic.schema.json
@@ -0,0 +1,33 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Job statistics",
+    "description": "Format specification for job metric statistics",
+    "type": "object",
+    "properties": {
+        "unit": {
+            "description": "Metric unit",
+            "#ref": "https://github.com/RRZE-HPC/HPCJobDatabase/blob/master/json-schema/unit.schema.json"
+        },
+        "avg": {
+            "description": "Job metric average",
+            "type": "number",
+            "minimum": 0
+        },
+        "min": {
+            "description": "Job metric minimum",
+            "type": "number",
+            "minimum": 0
+        },
+        "max": {
+            "description": "Job metric maximum",
+            "type": "number",
+            "minimum": 0
+        }
+    },
+    "required": [
+        "unit",
+        "avg",
+        "min",
+        "max"
+    ]
+}
diff --git a/dataformat/json/unit.schema.json b/dataformat/json/unit.schema.json
new file mode 100644
index 0000000..1917361
--- /dev/null
+++ b/dataformat/json/unit.schema.json
@@ -0,0 +1,36 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Metric unit",
+    "description": "Format specification for job metric units",
+    "type": "object",
+    "properties": {
+        "base_unit": {
+            "description": "Metric base unit",
+            "type": "string",
+            "enum": [
+                "B",
+                "F",
+                "B/s",
+                "F/s",
+                "CPI",
+                "IPC",
+                "Hz",
+            ]
+        },
+        "prefix": {
+            "description": "Unit prefix",
+            "type": "string",
+            "enum": [
+                "K",
+                "M",
+                "G",
+                "T",
+                "P",
+                "E"
+            ]
+        }
+    },
+    "required": [
+        "base_unit"
+    ]
+}
diff --git a/dataformat/sql/jobDB-sqlite.sql b/dataformat/sql/jobDB-sqlite.sql
new file mode 100644
index 0000000..c9727c8
--- /dev/null
+++ b/dataformat/sql/jobDB-sqlite.sql
@@ -0,0 +1,10 @@
+CREATE TABLE job ( id INTEGER PRIMARY KEY,
+ job_id TEXT, user_id TEXT, project_id TEXT, cluster_id TEXT,
+ start_time INTEGER, stop_time INTEGER, duration INTEGER,
+ walltime INTEGER, job_state TEXT,
+ num_nodes INTEGER, node_list TEXT, has_profile INTEGER,
+ mem_used_max REAL, flops_any_avg REAL, mem_bw_avg REAL, ib_bw_avg REAL, file_bw_avg REAL);
+CREATE TABLE tag ( id INTEGER PRIMARY KEY, tag_type TEXT, tag_name TEXT);
+CREATE TABLE jobtag ( job_id INTEGER, tag_id INTEGER, PRIMARY KEY (job_id, tag_id),
+ FOREIGN KEY (job_id) REFERENCES job (id)  ON DELETE CASCADE ON UPDATE NO ACTION,
+ FOREIGN KEY (tag_id) REFERENCES tag (id)  ON DELETE CASCADE ON UPDATE NO ACTION );